[Bug 697197] Re: Empty password allows access to VNC in libvirt

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On 2011-01-10T20:45:01+00:00 Petr wrote:

Description of problem:
The semantics of the ',password' option to -vnc are that it enables the VNC 
auth scheme. If the VNC server password is unset or empty string, all attempts 
to authenticate with the server will be explicitly blocked.

This allows applications to enable and selectively allow access for a
period of time, before clearing the password again to prevent further
access.

Upstream changes have introduced a flaw by disabling all authentication
when the password was cleared with upstream commit [1].

[1]
http://www.qemu.com/qemu.git/commit/?id=52c18be9e99dabe295321153fda7fce9f76647ac

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/9


On 2011-01-28T18:02:42+00:00 Neil wrote:

Created attachment 475841
Fix to vnc password semantics

This patch corrects the flaw in qemu-kvm

Please see http://launchpad.net/bugs/697197 for testing performed.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/15


On 2011-02-28T11:09:05+00:00 Petr wrote:

Created qemu tracking bugs for this issue

Affects: fedora-all [bug 680886]

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/31


On 2011-03-10T20:11:32+00:00 errata-xmlrpc wrote:

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0345 https://rhn.redhat.com/errata/RHSA-2011-0345.html

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/32


On 2012-03-30T17:33:58+00:00 Petr wrote:

Statement:

This issue does not affect versions of kvm package as shipped with Red
Hat Enterprise Linux 5.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/33

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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On 2011-01-04T12:30:55+00:00 Neil wrote:

Description of problem:

The help for 'vnc_password' in qemu.conf states "An empty string will
still enable passwords, but be rejected by QEMU effectively preventing
any use of VNC.".

Yet if you set vnc_password="" then you can access the VNC console
without any password prompt at all - just as you can if the entry is
hashed out.

Version-Release number of selected component (if applicable):

libvirtd (libvirt) 0.8.3


How reproducible:

Every time by configuration

Steps to Reproduce:
1. Create a VNC console without a password.
2. Set vnc_password="" in /etc/libvirt/qemu.conf
3. Start up a guest and access the VNC console with a client. 
  
Actual results:

You get straight into the console with no prompts.


Expected results:

Should have come up with a prompt and rejected the access. Or the
instructions in the qemu.conf file need changing to take account of the
current behaviour.

Additional info:

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/2


On 2011-01-04T12:48:32+00:00 Neil wrote:

Similarly if you set the passwd attribute to '' in the vnc graphics XML
stanza.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/3


On 2011-01-07T14:45:34+00:00 Daniel wrote:

This is not a libvirt bug. This is caused by a flaw in particular QEMU
version you are using, which silently disables auth when the password is
set to "". This bug was introduced in QEMU in this bogus commit

commit 52c18be9e99dabe295321153fda7fce9f76647ac
Author: Zachary Amsden 
Date:   Thu Jul 30 00:15:01 2009 -1000

When using stdio monitor and VNC display, one can set or clear a VNC
password; this should set or turn off VNC authentication as well.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/comments/5


** Changed in: libvirt
   Status: Unknown => Invalid

** Changed in: libvirt
   Importance: Unknown => Medium

** Changed in: qemu-kvm
   Status: Unknown => Fix Released

** Changed in: qemu-kvm
   Importance: Unknown => Medium

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[pranith]

** Changed in: qemu
   Status: Confirmed => Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[pranith]

** Changed in: qemu
   Status: Confirmed => Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Stephan S.]

Ubuntu 12.04 is also affected

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Stephan S.]

** Branch linked: lp:ubuntu/precise/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Stephan S.]

Ubuntu 12.04 is also affected

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Stephan S.]

** Branch linked: lp:ubuntu/precise/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Changed in: qemu-kvm (Debian)
   Status: New = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Changed in: qemu-kvm (Debian)
   Status: New = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Michael Tokarev]

** Bug watch added: Debian Bug tracker #611134
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611134

** Also affects: qemu-kvm (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611134
   Importance: Unknown
   Status: Unknown

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Changed in: qemu-kvm (Debian)
   Status: Unknown = New

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Michael Tokarev]

** Bug watch added: Debian Bug tracker #611134
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611134

** Also affects: qemu-kvm (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611134
   Importance: Unknown
   Status: Unknown

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Changed in: qemu-kvm (Debian)
   Status: Unknown = New

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Branch linked: lp:ubuntu/lucid-proposed/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

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** Branch linked: lp:ubuntu/lucid-proposed/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/maverick-updates/qemu-kvm

** Branch linked: lp:ubuntu/lucid-updates/qemu-kvm

** Branch linked: lp:ubuntu/karmic-security/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/maverick-updates/qemu-kvm

** Branch linked: lp:ubuntu/lucid-updates/qemu-kvm

** Branch linked: lp:ubuntu/karmic-security/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Marc Deslauriers]

Nothing left to do, unsubscribing ubuntu-security-sponsors.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Marc Deslauriers]

Nothing left to do, unsubscribing ubuntu-security-sponsors.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.12.5+noroms-0ubuntu7.2

---
qemu-kvm (0.12.5+noroms-0ubuntu7.2) maverick-security; urgency=low

  [ Dustin Kirkland ]
  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197).
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011

  [ Kees Cook ]
  * debian/rules: disable parallel build; fix FTBFS.
 -- Kees Cook k...@ubuntu.com   Fri, 11 Feb 2011 15:52:12 -0800

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: Fix Committed = Fix Released

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: Fix Committed = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.11.0-0ubuntu6.4

---
qemu-kvm (0.11.0-0ubuntu6.4) karmic-security; urgency=low

  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 17:46:26 -0600

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.12.3+noroms-0ubuntu9.4

---
qemu-kvm (0.12.3+noroms-0ubuntu9.4) lucid-security; urgency=low

  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 09:57:30 -0600

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: Fix Committed = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.12.5+noroms-0ubuntu7.2

---
qemu-kvm (0.12.5+noroms-0ubuntu7.2) maverick-security; urgency=low

  [ Dustin Kirkland ]
  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197).
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011

  [ Kees Cook ]
  * debian/rules: disable parallel build; fix FTBFS.
 -- Kees Cook k...@ubuntu.com   Fri, 11 Feb 2011 15:52:12 -0800

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: Fix Committed = Fix Released

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: Fix Committed = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.12.3+noroms-0ubuntu9.4

---
qemu-kvm (0.12.3+noroms-0ubuntu9.4) lucid-security; urgency=low

  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 09:57:30 -0600

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: Fix Committed = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.11.0-0ubuntu6.4

---
qemu-kvm (0.11.0-0ubuntu6.4) karmic-security; urgency=low

  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9, thanks to Neil Wilson.
- CVE-2011-0011
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 17:46:26 -0600

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Changed in: qemu-kvm (Ubuntu)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu)
   Status: Confirmed = In Progress

** Changed in: qemu-kvm (Ubuntu)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Also affects: libvirt (Ubuntu Maverick)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided
   Status: New

** Also affects: libvirt (Ubuntu Natty)
   Importance: High
 Assignee: Serge Hallyn (serge-hallyn)
   Status: Invalid

** Also affects: qemu-kvm (Ubuntu Natty)
   Importance: Medium
 Assignee: Dustin Kirkland (kirkland)
   Status: In Progress

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Looks good, thanks for doing this, Neil.

I'm going to update it just slightly, as this debdiff will need to go
through the security queue, since there's an associated CVE.  I'll prep
that upload and the security team will sponsor it into maverick-
security.

I'll get it uploaded to natty now.

The last thing I need you to do is to email your patch to the qemu-devel
mailing list.  The maintainers do not accept patches solely attached to
bugs in Launchpad.  Their processes require that you email the patch to
the mailing list.  Sorry for the run-around.  Cheers!

** Changed in: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: New = In Progress

** Changed in: qemu-kvm (Ubuntu Maverick)
Milestone: None = maverick-updates

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

@security team,

Could you please sponsor this to the maverick-security queue?  Thanks!

** Patch added: 697197.debdiff
   
https://bugs.launchpad.net/ubuntu/maverick/+source/qemu-kvm/+bug/697197/+attachment/1843528/+files/697197.debdiff

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: Dustin Kirkland (kirkland) = Ubuntu Security Team 
(ubuntu-security)

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Title:
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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Changed in: libvirt (Ubuntu Maverick)
   Status: New = Invalid

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

The patch needs to go into Lucid as well.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Marking the libvirt tasks invalid, as upstream libvirt has correctly pointed 
out that this bug is in qemu, and not libvirt:
 * https://bugzilla.redhat.com/show_bug.cgi?id=667097

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Uploading to Natty now...

** Also affects: libvirt (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Changed in: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: New = In Progress

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Confirmed that the affected code is also in Lucid.  Adding a task for
that, and attaching a debdiff for lucid-security too.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.13.0+noroms-0ubuntu13

---
qemu-kvm (0.13.0+noroms-0ubuntu13) natty; urgency=low

  [ Neil Wilson n...@aldur.co.uk ]
  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9
- CVE: 2011-0011

  [ Dustin Kirkland ]
  * Updated patch to reflect the move of vnc.c to ui/vnc.c
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 09:53:19 -0600

** Changed in: qemu-kvm (Ubuntu Natty)
   Status: In Progress = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Attaching Lucid debdiff.

** Patch added: 697197.lucid.debdiff
   
https://bugs.launchpad.net/ubuntu/lucid/+source/qemu-kvm/+bug/697197/+attachment/1843553/+files/697197.lucid.debdiff

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: Dustin Kirkland (kirkland) = Ubuntu Security Team 
(ubuntu-security)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:~kirkland/ubuntu/natty/qemu-kvm/fix-build

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

** Changed in: libvirt (Ubuntu Natty)
   Importance: High = Undecided

** Changed in: libvirt (Ubuntu Natty)
 Assignee: Serge Hallyn (serge-hallyn) = (unassigned)

** Changed in: qemu-kvm (Ubuntu Maverick)
Milestone: maverick-updates = None

** Changed in: libvirt (Ubuntu Lucid)
   Status: New = Invalid

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

Thanks for preparing the debdiffs! It looks like karmic is vulnerable
too, so we'll need that as well. I'll update the debdiffs to use proper
DEP-3 and fix up the formatting of the changelogs a bit (CVE- vs CVE:
), and get these building.

** Also affects: libvirt (Ubuntu Karmic)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Karmic)
   Importance: Undecided
   Status: New

** Changed in: libvirt (Ubuntu Karmic)
   Status: New = Invalid

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: New = In Progress

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Attaching debdiff for karmic.

** Patch added: 697197.karmic.debdiff
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/+attachment/1844267/+files/697197.karmic.debdiff

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: Ubuntu Security Team (ubuntu-security) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: Ubuntu Security Team (ubuntu-security) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Karmic)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Karmic)
 Assignee: (unassigned) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: In Progress = Fix Committed

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: In Progress = Fix Committed

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: In Progress = Fix Committed

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Changed in: qemu-kvm (Ubuntu)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu)
   Status: Confirmed = In Progress

** Changed in: qemu-kvm (Ubuntu)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Also affects: libvirt (Ubuntu Maverick)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided
   Status: New

** Also affects: libvirt (Ubuntu Natty)
   Importance: High
 Assignee: Serge Hallyn (serge-hallyn)
   Status: Invalid

** Also affects: qemu-kvm (Ubuntu Natty)
   Importance: Medium
 Assignee: Dustin Kirkland (kirkland)
   Status: In Progress

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Looks good, thanks for doing this, Neil.

I'm going to update it just slightly, as this debdiff will need to go
through the security queue, since there's an associated CVE.  I'll prep
that upload and the security team will sponsor it into maverick-
security.

I'll get it uploaded to natty now.

The last thing I need you to do is to email your patch to the qemu-devel
mailing list.  The maintainers do not accept patches solely attached to
bugs in Launchpad.  Their processes require that you email the patch to
the mailing list.  Sorry for the run-around.  Cheers!

** Changed in: qemu-kvm (Ubuntu Maverick)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: New = In Progress

** Changed in: qemu-kvm (Ubuntu Maverick)
Milestone: None = maverick-updates

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

@security team,

Could you please sponsor this to the maverick-security queue?  Thanks!

** Patch added: 697197.debdiff
   
https://bugs.launchpad.net/ubuntu/maverick/+source/qemu-kvm/+bug/697197/+attachment/1843528/+files/697197.debdiff

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: Dustin Kirkland (kirkland) = Ubuntu Security Team 
(ubuntu-security)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

** Changed in: libvirt (Ubuntu Maverick)
   Status: New = Invalid

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

The patch needs to go into Lucid as well.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Marking the libvirt tasks invalid, as upstream libvirt has correctly pointed 
out that this bug is in qemu, and not libvirt:
 * https://bugzilla.redhat.com/show_bug.cgi?id=667097

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Uploading to Natty now...

** Also affects: libvirt (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Changed in: qemu-kvm (Ubuntu Lucid)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: New = In Progress

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: (unassigned) = Dustin Kirkland (kirkland)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Confirmed that the affected code is also in Lucid.  Adding a task for
that, and attaching a debdiff for lucid-security too.

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

This bug was fixed in the package qemu-kvm - 0.13.0+noroms-0ubuntu13

---
qemu-kvm (0.13.0+noroms-0ubuntu13) natty; urgency=low

  [ Neil Wilson n...@aldur.co.uk ]
  * SECURITY UPDATE: Setting VNC password to empty string silently
disables all authentication (LP: #697197)
- debian/patches/697197-fix-vnc-password-semantics.patch: Reverses the
  change introduced in Qemu by git commit 52c18be9
- CVE: 2011-0011

  [ Dustin Kirkland ]
  * Updated patch to reflect the move of vnc.c to ui/vnc.c
 -- Dustin Kirkland kirkl...@ubuntu.com   Fri, 11 Feb 2011 09:53:19 -0600

** Changed in: qemu-kvm (Ubuntu Natty)
   Status: In Progress = Fix Released

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Attaching Lucid debdiff.

** Patch added: 697197.lucid.debdiff
   
https://bugs.launchpad.net/ubuntu/lucid/+source/qemu-kvm/+bug/697197/+attachment/1843553/+files/697197.lucid.debdiff

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: Dustin Kirkland (kirkland) = Ubuntu Security Team 
(ubuntu-security)

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:~kirkland/ubuntu/natty/qemu-kvm/fix-build

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/qemu-kvm

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

** Changed in: libvirt (Ubuntu Natty)
   Importance: High = Undecided

** Changed in: libvirt (Ubuntu Natty)
 Assignee: Serge Hallyn (serge-hallyn) = (unassigned)

** Changed in: qemu-kvm (Ubuntu Maverick)
Milestone: maverick-updates = None

** Changed in: libvirt (Ubuntu Lucid)
   Status: New = Invalid

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

Thanks for preparing the debdiffs! It looks like karmic is vulnerable
too, so we'll need that as well. I'll update the debdiffs to use proper
DEP-3 and fix up the formatting of the changelogs a bit (CVE- vs CVE:
), and get these building.

** Also affects: libvirt (Ubuntu Karmic)
   Importance: Undecided
   Status: New

** Also affects: qemu-kvm (Ubuntu Karmic)
   Importance: Undecided
   Status: New

** Changed in: libvirt (Ubuntu Karmic)
   Status: New = Invalid

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: New = In Progress

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Dustin Kirkland]

Attaching debdiff for karmic.

** Patch added: 697197.karmic.debdiff
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/+attachment/1844267/+files/697197.karmic.debdiff

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Kees Cook]

** Changed in: qemu-kvm (Ubuntu Maverick)
 Assignee: Ubuntu Security Team (ubuntu-security) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Lucid)
 Assignee: Ubuntu Security Team (ubuntu-security) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Karmic)
   Importance: Undecided = Medium

** Changed in: qemu-kvm (Ubuntu Karmic)
 Assignee: (unassigned) = Kees Cook (kees)

** Changed in: qemu-kvm (Ubuntu Lucid)
   Status: In Progress = Fix Committed

** Changed in: qemu-kvm (Ubuntu Maverick)
   Status: In Progress = Fix Committed

** Changed in: qemu-kvm (Ubuntu Karmic)
   Status: In Progress = Fix Committed

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Anthony Liguori]

** Changed in: qemu
   Status: New = Confirmed

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Anthony Liguori]

** Changed in: qemu
   Status: New = Confirmed

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Also affects: qemu
   Importance: Undecided
   Status: New

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

The solution to this problem is to reverse the commit
52c18be9e99dabe295321153fda7fce9f76647ac in the main Qemu archive.

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:~brightbox/ubuntu/maverick/qemu-kvm/qemu-
kvm.fix-697197

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Patch added: qemu-kvm_0.12.5+noroms-0ubuntu7.2.debdiff
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/+attachment/1812796/+files/qemu-kvm_0.12.5%2Bnoroms-0ubuntu7.2.debdiff

** Tags added: patch

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Installed patched build onto Maverick server. vnc_listen set to 0.0.0.0
in /etc/libvirt/qemu.conf

Set vnc_password=' with vnc_tls=1 in /etc/libvirt/qemu.conf and
confirmed that the lanched server now rejects authentication for any
password, whereas it turned off authentication and encryption completely
before.

Hashed out vnc_password and left vnc_tls=1 in /etc/libvirt/qemu.conf.
Confirmed that the server uses anonymous auth with TLS. Allows the user
on without a password. qemu-kvm launched with -vnc
0.0.0.0:0,tls,x509=/etc/pki/libvirt-vnc

Hashed out vnc_tls=1. Confirmed server allows direct access to VNC.
qemu-kvm launched with -vnc 0.0.0.0:0

Set vnc_password=. Confirmed server rejects authentication for any
password, with no encryption. Again previously it had just let the user
on. qemu-kvm launched with -vnc 0.0.0.0:0,password

set vnc_password=password. Confirmed server accepts authentication
with that password. qemu-kvm launched with -vnc 0.0.0.0:0,password

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Please sponsor for upload

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

This fault probably affects all the current versions of qemu-kvm. It's
present in 0.11 and the current qemu master branch.

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Also affects: qemu
   Importance: Undecided
   Status: New

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

The solution to this problem is to reverse the commit
52c18be9e99dabe295321153fda7fce9f76647ac in the main Qemu archive.

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Launchpad Bug Tracker]

** Branch linked: lp:~brightbox/ubuntu/maverick/qemu-kvm/qemu-
kvm.fix-697197

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Patch added: qemu-kvm_0.12.5+noroms-0ubuntu7.2.debdiff
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197/+attachment/1812796/+files/qemu-kvm_0.12.5%2Bnoroms-0ubuntu7.2.debdiff

** Tags added: patch

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Installed patched build onto Maverick server. vnc_listen set to 0.0.0.0
in /etc/libvirt/qemu.conf

Set vnc_password=' with vnc_tls=1 in /etc/libvirt/qemu.conf and
confirmed that the lanched server now rejects authentication for any
password, whereas it turned off authentication and encryption completely
before.

Hashed out vnc_password and left vnc_tls=1 in /etc/libvirt/qemu.conf.
Confirmed that the server uses anonymous auth with TLS. Allows the user
on without a password. qemu-kvm launched with -vnc
0.0.0.0:0,tls,x509=/etc/pki/libvirt-vnc

Hashed out vnc_tls=1. Confirmed server allows direct access to VNC.
qemu-kvm launched with -vnc 0.0.0.0:0

Set vnc_password=. Confirmed server rejects authentication for any
password, with no encryption. Again previously it had just let the user
on. qemu-kvm launched with -vnc 0.0.0.0:0,password

set vnc_password=password. Confirmed server accepts authentication
with that password. qemu-kvm launched with -vnc 0.0.0.0:0,password

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Please sponsor for upload

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

This fault probably affects all the current versions of qemu-kvm. It's
present in 0.11 and the current qemu master branch.

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

CVE issued putting the onus squarely on qemu's shoulders.

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2011-0011

** Changed in: libvirt (Ubuntu)
   Status: Confirmed = Invalid

** Changed in: qemu-kvm (Ubuntu)
   Status: New = Confirmed

** Bug watch added: Red Hat Bugzilla #668589
   https://bugzilla.redhat.com/show_bug.cgi?id=668589

** Also affects: qemu-kvm via
   https://bugzilla.redhat.com/show_bug.cgi?id=668589
   Importance: Unknown
   Status: Unknown

** This bug has been flagged as a security vulnerability

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

CVE issued putting the onus squarely on qemu's shoulders.

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2011-0011

** Changed in: libvirt (Ubuntu)
   Status: Confirmed = Invalid

** Changed in: qemu-kvm (Ubuntu)
   Status: New = Confirmed

** Bug watch added: Red Hat Bugzilla #668589
   https://bugzilla.redhat.com/show_bug.cgi?id=668589

** Also affects: qemu-kvm via
   https://bugzilla.redhat.com/show_bug.cgi?id=668589
   Importance: Unknown
   Status: Unknown

** This bug has been flagged as a security vulnerability

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Libvirt is in the clear on this one. It is a mild security issue
introduced into QEMU.

** Changed in: libvirt (Ubuntu)
   Status: Confirmed = Invalid

** Also affects: qemu-kvm (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

When I say in the clear, the libvirt guys think they're in the clear.

Checked the qemu source and there is no fix for this problem. Could be a
change of behaviour.

** Changed in: libvirt (Ubuntu)
   Status: Invalid = Confirmed

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

Libvirt is in the clear on this one. It is a mild security issue
introduced into QEMU.

** Changed in: libvirt (Ubuntu)
   Status: Confirmed = Invalid

** Also affects: qemu-kvm (Ubuntu)
   Importance: Undecided
   Status: New

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

When I say in the clear, the libvirt guys think they're in the clear.

Checked the qemu source and there is no fix for this problem. Could be a
change of behaviour.

** Changed in: libvirt (Ubuntu)
   Status: Invalid = Confirmed

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Serge Hallyn]

** Changed in: libvirt (Ubuntu)
 Assignee: (unassigned) = Serge Hallyn (serge-hallyn)

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Title:
  Empty password allows access to VNC in libvirt

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Re: [Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

From the libvirt list

The behaviour you're seeing is a bug recently introduced in
 the QEMU monitor password command handling by QEMU GIT repo
 changeset 52c18be9e99dabe295321153fda7fce9f76647ac.
 


On 7 January 2011 14:41, Serge Hallyn 697...@bugs.launchpad.net wrote:
 ** Changed in: libvirt (Ubuntu)
     Assignee: (unassigned) = Serge Hallyn (serge-hallyn)

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 Title:
  Empty password allows access to VNC in libvirt



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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Serge Hallyn]

** Changed in: libvirt (Ubuntu)
 Assignee: (unassigned) = Serge Hallyn (serge-hallyn)

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Re: [Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

From the libvirt list

The behaviour you're seeing is a bug recently introduced in
 the QEMU monitor password command handling by QEMU GIT repo
 changeset 52c18be9e99dabe295321153fda7fce9f76647ac.
 


On 7 January 2011 14:41, Serge Hallyn 697...@bugs.launchpad.net wrote:
 ** Changed in: libvirt (Ubuntu)
     Assignee: (unassigned) = Serge Hallyn (serge-hallyn)

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 Title:
  Empty password allows access to VNC in libvirt



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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Serge Hallyn]

Thanks for taking the time to report this bug and helping to make Ubuntu
better.

The feature itself may be low priority, bug getting the comment in the
qemu.conf file fixed so that no admins get caught by surprise seems like
high priority.  I see no activity in the upstream bug yet, though, so
will wait to see what feedback happens there.

** Changed in: libvirt (Ubuntu)
   Status: New = Confirmed

** Changed in: libvirt (Ubuntu)
   Importance: Undecided = Medium

** Changed in: libvirt (Ubuntu)
   Importance: Medium = High

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Serge Hallyn]

Thanks for taking the time to report this bug and helping to make Ubuntu
better.

The feature itself may be low priority, bug getting the comment in the
qemu.conf file fixed so that no admins get caught by surprise seems like
high priority.  I see no activity in the upstream bug yet, though, so
will wait to see what feedback happens there.

** Changed in: libvirt (Ubuntu)
   Status: New = Confirmed

** Changed in: libvirt (Ubuntu)
   Importance: Undecided = Medium

** Changed in: libvirt (Ubuntu)
   Importance: Medium = High

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

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Title:
  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Bug watch added: Red Hat Bugzilla #667097
   https://bugzilla.redhat.com/show_bug.cgi?id=667097

** Also affects: libvirt via
   https://bugzilla.redhat.com/show_bug.cgi?id=667097
   Importance: Unknown
   Status: Unknown

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

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  Empty password allows access to VNC in libvirt

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[Bug 697197] Re: Empty password allows access to VNC in libvirt

[Neil Wilson]

** Bug watch added: Red Hat Bugzilla #667097
   https://bugzilla.redhat.com/show_bug.cgi?id=667097

** Also affects: libvirt via
   https://bugzilla.redhat.com/show_bug.cgi?id=667097
   Importance: Unknown
   Status: Unknown

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  Empty password allows access to VNC in libvirt

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