Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Thomas Krichel
  Izak Burger writes

 Nothing exciting ...

  If you need excitement come over here. I had a box infected
  by the DSA-2131 vulnerabilty. It wouldn't resinstall psutils,
  griping not having permission to cp /bin/ps or somethnig.
  I copied chattr from another box, nebka, with the same architecture.

  Then I did

chattr -sia /bin/ps ; scp r...@nebka:/usr/bin/ps /usr/bin/ps ; sudo apt-get -y 
install --reinstall procps

  for all every binary (here ps) procps did succesively complain 
  it could not install. This solved the issue after a whole
  bunch of iterations.


  Cheers,

  Thomas Krichelhttp://openlib.org/home/krichel
http://authorclaim.org/profile/pkr1
   skype: thomaskrichel


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Andrew McGlashan

Thomas Krichel wrote:

chattr -sia /bin/ps ; scp r...@nebka:/usr/bin/ps /usr/bin/ps ; sudo apt-get -y 
install --reinstall procps


So, in effect, did you possibly give away your root password or pass 
phrase key for the netbka machine?


I wouldn't be that trusting, you already know you were compromised -- 
best to re-install clean if you ask me.


In the Windows world, my advice is the same, no matter how well you 
clean things, there is always the possibility that something nasty will 
remain undetected; it isn't worth that risk IMHO.


Cheers

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Kind Regards
AndrewM

Andrew McGlashan
Broadband Solutions now including VoIP


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Thomas Krichel
  Andrew McGlashan writes

 Thomas Krichel wrote:
 chattr -sia /bin/ps ; scp r...@nebka:/usr/bin/ps /usr/bin/ps ; sudo apt-get 
 -y install --reinstall procps
 
 So, in effect, did you possibly give away your root password or pass
 phrase key for the netbka machine?

  Yup. After killing the dropbear process.

 I wouldn't be that trusting,

  I wouldn't be either, but what is man to do who is
  not a security expert to do?

 you already know you were compromised
 -- best to re-install clean if you ask me.

  yeah, but I have no physical access to the infected
  box and must keep its data. I reinstalled all the
  packages. psutils was the one that got aptitude
  stymied.


  Cheers,

  Thomas Krichelhttp://openlib.org/home/krichel
http://authorclaim.org/profile/pkr1
   skype: thomaskrichel


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Andrew McGlashan

Thomas Krichel wrote:

  Andrew McGlashan writes


Thomas Krichel wrote:

chattr -sia /bin/ps ; scp r...@nebka:/usr/bin/ps /usr/bin/ps ; sudo apt-get -y 
install --reinstall procps

So, in effect, did you possibly give away your root password or pass
phrase key for the netbka machine?


  Yup. After killing the dropbear process.


Perhaps it would have been better to work from from a non-infected 
machine; do the scp of such files  or better still just backup the data.


nebka:# scp -p /usr/bin/ps r...@infected-machine:/usr/bin/ps

and/or

nebka:# scp -pr /saved-data-dir r...@infected-machine:/data-dir

rsync might be an option too...

Perhaps even use a live-cd or work in a chroot to offer as much 
protection as possible for the non-infected machine.


You've also got to hope that scp or any other programs/binaries you rely 
on themselves aren't infected on the compromised machine in a way that 
might cause further issues.



I wouldn't be that trusting,


  I wouldn't be either, but what is man to do who is
  not a security expert to do?


you already know you were compromised
-- best to re-install clean if you ask me.


  yeah, but I have no physical access to the infected
  box and must keep its data. I reinstalled all the
  packages. psutils was the one that got aptitude
  stymied.


If you have no physical access, do you have a way to nuke and 
re-install?  Is it VPS or similar?


Something I've discovered as a really good feature of HP's iLO is the 
ability to mount an ISO from a local / trusted source and boot a machine 
remotely using the virtually mounted CD/DVD -- that gives you a whole 
new level of access without the need for actual physical access.  You 
can work with a console remotely too in this case.  Once it is running, 
you could install ssh server, set a password and use it in a more 
traditional way.  Of course, it won't help if the machine doesn't have 
iLO or is a VPS itself -- but there might be similar methods with a VPS.


Oh and HP's iLO might need an advanced license for virtual media to 
work, not sure about that yet.  I picked up a nice DL380 G4 with the 
advanced iLO license already installed.


Cheers

--
Kind Regards
AndrewM

Andrew McGlashan
Broadband Solutions now including VoIP


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Andrew McGlashan

Andrew McGlashan wrote:

nebka:# scp -pr /saved-data-dir r...@infected-machine:/data-dir


Umm, correction

scp -pr r...@infected-machine:/data-dir /saved-data-dir

Oh and HP's iLO might need an advanced license for virtual media to 
work, not sure about that yet.  I picked up a nice DL380 G4 with the 
advanced iLO license already installed.


Yep, the virtual media is an advanced license feature, just looked up 
the manuals (PDF search).  Sure is handy though.


Cheers

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AndrewM

Andrew McGlashan
Broadband Solutions now including VoIP


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-18 Thread Izak Burger
On Sat, Dec 18, 2010 at 4:25 PM, Andrew McGlashan
andrew.mcglas...@affinityvision.com.au wrote:
 Oh and HP's iLO might need an advanced license for virtual media to work,
 not sure about that yet.  I picked up a nice DL380 G4 with the advanced iLO
 license already installed.

Yup, I've also discovered that one day when we reinstalled a machine
and discovered too late that the broadcom network controller needs
firmware. Then we discovered you need a license to use the usb-stick
image upload trick... which prompts the question: If I already paid
for the hardware, why in the blazes cripple it unless I pay you more?
But now I'm ranting :-)


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exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Thorsten Göllner

Hi,

I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver 
mails. I always get the message, that the mail is not routeable. I only 
used dpkg-reconfigure exim4-config without touching one config file by 
hand. I detected a log message (panic log) which says, that there was a 
too large message. Since that point exim4 stopped working.


The other point is that pstree reports a process zinit I never saw in 
the past:

(see last line of output)

# pstree -A
init-+-acpid
 |-apache2---17*[apache2]
 |-atd
 |-cron
 |-exim4
 |-6*[getty]
 |-inetd
 |-mysqld_safe-+-logger
 | `-mysqld---41*[{mysqld}]
 |-ntpd---ntpd
 |-portmap
 |-python
 |-rpc.statd
 |-rsyslogd---3*[{rsyslogd}]
 |-sensord
 |-smartd
 |-sshd---sshd---sshd---bash---su---bash---pstree
 |-udevd
 `-zinit---{zinit}

I found it here:
# ls -lah /sbin/zinit
-rwxr-x--x 1 root root 1.9M 2008-08-12 16:09 /sbin/zinit

But I do not have any idea what it is. And I can not see the process 
with ps:


# ps aux | grep zinit
root  5125  0.0  0.0   3120   708 pts/0R+   12:00   0:00 grep zinit

/* output of exim4 test */
===
# exim4 -d -bt t...@ovm-group.com
Exim version 4.69 uid=0 gid=0 pid=4981 D=fbb95cfd
Berkeley DB: Berkeley DB 4.6.21: (September 27, 2007)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages
Lookups: lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb 
dsearch nis nis0 passwd

Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
changed uid/gid: forcing real = effective
  uid=0 gid=0 pid=4981
  auxiliary group list: none
configuration file is /etc/exim4/exim4.conf
log selectors = 0ffc 00210001
trusted user
admin user
originator: uid=0 gid=0 login=root name=root
sender address = r...@nostradamus.urc24.org
Address testing: uid=0 gid=103 euid=0 egid=103

Testing t...@ovm-group.com

Considering t...@ovm-group.com

routing t...@ovm-group.com
no more routers
t...@ovm-group.com is undeliverable: Unrouteable address
search_tidyup called
 Exim pid=4981 terminating with rc=2 

Do I have a security issue here? Any other idea?

Thank you in advance,
-Thorsten-


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread mail...@securitylabs.it

On 17/12/2010 12:00, Thorsten Göllner wrote:

Hi,

I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver 
mails. I always get the message, that the mail is not routeable. I 
only used dpkg-reconfigure exim4-config without touching one config 
file by hand. I detected a log message (panic log) which says, that 
there was a too large message. Since that point exim4 stopped working.




Have you upgraded the exim package to the last  version?

http://www.debian.org/security/2010/dsa-2131


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Carlos Alberto Lopez Perez
On 12/17/2010 12:00 PM, Thorsten Göllner wrote:
 Hi,
 
 I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver
 mails. I always get the message, that the mail is not routeable. I only
 used dpkg-reconfigure exim4-config without touching one config file by
 hand. I detected a log message (panic log) which says, that there was a
 too large message. Since that point exim4 stopped working.
 
 The other point is that pstree reports a process zinit I never saw in the
 past:
 (see last line of output)
 
 # pstree -A
 init-+-acpid
  |-apache2---17*[apache2]
  |-atd
  |-cron
  |-exim4
  |-6*[getty]
  |-inetd
  |-mysqld_safe-+-logger
  | `-mysqld---41*[{mysqld}]
  |-ntpd---ntpd
  |-portmap
  |-python
  |-rpc.statd
  |-rsyslogd---3*[{rsyslogd}]
  |-sensord
  |-smartd
  |-sshd---sshd---sshd---bash---su---bash---pstree
  |-udevd
  `-zinit---{zinit}
 
 I found it here:
 # ls -lah /sbin/zinit
 -rwxr-x--x 1 root root 1.9M 2008-08-12 16:09 /sbin/zinit
 
 But I do not have any idea what it is. And I can not see the process with
 ps:
 
 # ps aux | grep zinit
 root  5125  0.0  0.0   3120   708 pts/0R+   12:00   0:00 grep zinit
 


Try first to identify the package the file belongs to:

# dpkg -S /sbin/zinit

If no package is found then most probably your machine were compromised
(using the exim exploit [1] )and you should delete the zinit file
immediately and do a detailed audit of your machine security.

You can check if zinit is listening in any port

# netstat -anp | grep zinit

And try to connect to the port with telnet/netcat to see what is happening
there.


If the file belongs to a package then you can check the integrity of the
file with debsums

# debsums packagename


--
[1] http://seclists.org/fulldisclosure/2010/Dec/222



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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Vladislav Kurz
On Friday 17 of December 2010, Thorsten Göllner wrote:
 Hi,
 
 I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver
 mails. I always get the message, that the mail is not routeable. I only
 used dpkg-reconfigure exim4-config without touching one config file by
 hand. I detected a log message (panic log) which says, that there was a
 too large message. Since that point exim4 stopped working.

The last exploit of exim4 is based on too large messages causing buffer 
owerflows that can lead to root privileges. (Sorry for simplification, full 
details are on exim mailing list).
 
 The other point is that pstree reports a process zinit I never saw in
 the past:
 
 snip

 But I do not have any idea what it is. And I can not see the process
 with ps:
 

If pstree shows zinit and ps does not, it might mean that you are already 
rooted (owned, hacked, cracked, etc), and your ps binary was modified to hide 
the presence of rootkit named zinit.

 Do I have a security issue here? Any other idea?

IMHO yes, you have a security issue.

-- 
Regards
Vladislav Kurz


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Carlos Alberto Lopez Perez
On 12/17/2010 12:35 PM, Vladislav Kurz wrote:
 On Friday 17 of December 2010, Thorsten Göllner wrote:
 Hi,

 I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver
 mails. I always get the message, that the mail is not routeable. I only
 used dpkg-reconfigure exim4-config without touching one config file by
 hand. I detected a log message (panic log) which says, that there was a
 too large message. Since that point exim4 stopped working.
 
 The last exploit of exim4 is based on too large messages causing buffer 
 owerflows that can lead to root privileges. (Sorry for simplification, full 
 details are on exim mailing list).
  
 The other point is that pstree reports a process zinit I never saw in
 the past:

 snip

 But I do not have any idea what it is. And I can not see the process
 with ps:

 
 If pstree shows zinit and ps does not, it might mean that you are already 
 rooted (owned, hacked, cracked, etc), and your ps binary was modified to hide 
 the presence of rootkit named zinit.

Good point.

Try to check the md5sum of ps:

# apt-get install debsums
# debsums procps

 
 Do I have a security issue here? Any other idea?
 
 IMHO yes, you have a security issue.
 




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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Vladislav Kurz
On Friday 17 of December 2010, Carlos Alberto Lopez Perez wrote:
 On 12/17/2010 12:35 PM, Vladislav Kurz wrote:
  On Friday 17 of December 2010, Thorsten Göllner wrote:
  Hi,
  
  The other point is that pstree reports a process zinit I never saw in
  the past:
  
  snip
  
  But I do not have any idea what it is. And I can not see the process
  
  with ps:
  If pstree shows zinit and ps does not, it might mean that you are already
  rooted (owned, hacked, cracked, etc), and your ps binary was modified to
  hide the presence of rootkit named zinit.
 
 Good point.
 
 Try to check the md5sum of ps:
 
 # apt-get install debsums
 # debsums procps
 

just for reference - md5sum of /bin/ps on i386/lenny 
(checked from freshly downloaded package)

a6094706266c8ec3b068cf964824afee  /bin/ps

-- 
Regards
Vladislav Kurz


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RE: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Paul Stewart
I have a question related to this security announcement and hope it's
appropriate to ask here...

I just recently installed a couple of machines with Debian 5 using
netinstall.  They are running Exim which reports as 4.69 in the banner.

I have ran aptitude update/upgrade and not seeing anything new for Exim - am
I safe to assume I'm up to date and not vulnerable to this security issue?
Sorry, just started using Debian - been at least 5 years since I ran it and
wanted to make sure

Thanks,
Paul



-Original Message-
From: Vladislav Kurz [mailto:vladislav.k...@webstep.net] 
Sent: December-17-10 6:36 AM
To: debian-security@lists.debian.org
Subject: Re: exim4 router problems since 2 days / sucpicous process zinit
is pstree

On Friday 17 of December 2010, Thorsten Göllner wrote:
 Hi,
 
 I have installed Debian 5.0.7. Since 2 days my exim4 does not deliver
 mails. I always get the message, that the mail is not routeable. I only
 used dpkg-reconfigure exim4-config without touching one config file by
 hand. I detected a log message (panic log) which says, that there was a
 too large message. Since that point exim4 stopped working.

The last exploit of exim4 is based on too large messages causing buffer 
owerflows that can lead to root privileges. (Sorry for simplification, full 
details are on exim mailing list).
 
 The other point is that pstree reports a process zinit I never saw in
 the past:
 
 snip

 But I do not have any idea what it is. And I can not see the process
 with ps:
 

If pstree shows zinit and ps does not, it might mean that you are already 
rooted (owned, hacked, cracked, etc), and your ps binary was modified to
hide 
the presence of rootkit named zinit.

 Do I have a security issue here? Any other idea?

IMHO yes, you have a security issue.

-- 
Regards
Vladislav Kurz


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Vladislav Kurz
On Friday 17 of December 2010, Paul Stewart wrote:
 I have a question related to this security announcement and hope it's
 appropriate to ask here...
 
 I just recently installed a couple of machines with Debian 5 using
 netinstall.  They are running Exim which reports as 4.69 in the banner.
 
 I have ran aptitude update/upgrade and not seeing anything new for Exim -
 am I safe to assume I'm up to date and not vulnerable to this security
 issue? Sorry, just started using Debian - been at least 5 years since I
 ran it and wanted to make sure

If you have enabled the security updates repository then you should be OK.
Check your /etc/apt/sources.list if it contains this line:

deb http://security.debian.org/ lenny/updates main contrib non-free

And check version of exim4 using dpkg -l exim*. It should be: 4.69-9+lenny1.

-- 
Regards
Vladislav Kurz


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RE: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Eduardo M KALINOWSKI

On Sex, 17 Dez 2010, Paul Stewart wrote:

I have a question related to this security announcement and hope it's
appropriate to ask here...


This list is for it, but you should have started a new thread instead  
of hijacking an existing one.



I just recently installed a couple of machines with Debian 5 using
netinstall.  They are running Exim which reports as 4.69 in the banner.

I have ran aptitude update/upgrade and not seeing anything new for Exim - am
I safe to assume I'm up to date and not vulnerable to this security issue?
Sorry, just started using Debian - been at least 5 years since I ran it and
wanted to make sure


Make sure you are running version 4.69-9+lenny1 (of the package, not  
the banner). This version has the patch to fix the issue.



--
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Christian forbearance among men.
-- Ambrose Bierce

Eduardo M KALINOWSKI
edua...@kalinowski.com.br


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Thorsten Göllner


Am 17.12.2010 14:01, schrieb Vladislav Kurz:

On Friday 17 of December 2010, you wrote:

Am 17.12.2010 13:49, schrieb Vladislav Kurz:

On Friday 17 of December 2010, you wrote:

Am 17.12.2010 13:17, schrieb Vladislav Kurz:

On Friday 17 of December 2010, Carlos Alberto Lopez Perez wrote:

On 12/17/2010 12:35 PM, Vladislav Kurz wrote:

On Friday 17 of December 2010, Thorsten Göllner wrote:

Hi,

The other point is that pstree reports a process zinit I never saw
in the past:

snip

But I do not have any idea what it is. And I can not see the process
with ps:

If pstree shows zinit and ps does not, it might mean that you are
already rooted (owned, hacked, cracked, etc), and your ps binary was
modified to hide the presence of rootkit named zinit.

Good point.

Try to check the md5sum of ps:

# apt-get install debsums
# debsums procps

just for reference - md5sum of /bin/ps on i386/lenny
(checked from freshly downloaded package)

a6094706266c8ec3b068cf964824afee  /bin/ps

Thanks! My package matches.

Hmm, that's strange, cause if it's hacked, it shouldn't match.
Maybe even md5sum is hacked.

Please download procps, and md5sum on some clean computer, get them on
the problem machine, preferably on CD or some other non-writable media
and run those clean binaries.

Or if you can take your server down, reboot from any live-CD and check
md5sums again, using md5sum from live-cd.

Uh! OK, I now do not have really a chance to access the box (too far
away). Coudl you give me this from your box?
# shasum /bin/ps
234bba6212ca0cee9718bd74316d7c81e5e0b570  /bin/ps

its the same:
234bba6212ca0cee9718bd74316d7c81e5e0b570  /bin/ps

h, maybe the rootkit did not modify ps, but some system call that is used
by ps. Is it still so that ps ax does not show zinit and pstree does? what
about top?

I removed /sbin/zinit and did a reboot. The process is gone and I can 
not find out more about it now, sorry.


So my big last ciritical question is Shall I reinstall:
- /usr/bin/md5sum seems to be ok
- all installed packages are checked via debsums (maybe the local 
md5-databse has been manipulated? Can I update this database via dpkg?)

- zinit is gone
- no suspicious listening process can be found. A portscan is fine.
- /etc/passwd is ok
- Passwords were changed
- iptables -L is fine
- chkrootkit is fine (running from running system NOT from LiveCD)

Hard to say ...




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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Michael Cassano
 So my big last ciritical question is Shall I reinstall:


Why not reinstall?  What if something is hiding that you forgot to check?
What if your binaries are modified in a way that it's making it hard for you
to guarantee they aren't modified?

No question, reinstall.

Mike


Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Izak Burger
 No question, reinstall.

I agree, this is a root exploit, and once you have root you can pretty
much hide anything you want.

On a side note, the patch even applies cleanly on older versions of
exim (such as 4.63), so if you're stuck with an older exim for
whatever reason (like I am), its easy enough to patch.

Cheers,
Izak


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Thorsten Göllner



Am 17.12.2010 14:26, schrieb Izak Burger:

No question, reinstall.

I agree, this is a root exploit, and once you have root you can pretty
much hide anything you want.

On a side note, the patch even applies cleanly on older versions of
exim (such as 4.63), so if you're stuck with an older exim for
whatever reason (like I am), its easy enough to patch.

Cheers,
Izak



Your are (both) right. I will reinstall.

Thank you all for your help!


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Scott Edwards
 I agree, this is a root exploit, and once you have root you can pretty
 much hide anything you want.


 No question, reinstall.

Depending on your scope,
http://www.cert.org/tech_tips/win-UNIX-system_compromise.html still
has some value.  It sounds as though you'll probably be fine with a
reinstall (nuke from orbit, of trusted media).

If you use anything from backups, be cautious of any content after any
trusted time. Eg, when you know it wasn't an issue, not just think it
wasn't an issue. You don't want to introduce a weakness the attacker
left some place else (like a database password, misc settings, etc).

Good luck :)

Scott.


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Re: exim4 router problems since 2 days / sucpicous process zinit is pstree

2010-12-17 Thread Izak Burger
On Fri, Dec 17, 2010 at 3:44 PM, Thorsten Göllner t...@ovm-group.com wrote:
 Your are (both) right. I will reinstall.

What would be really nice though, is if you could do some kind of
post-mortem. I am always curious to know the techniques of the
black-hats, makes for nice war-stories around the camp fire :-)

Unfortunately the incidents I know are rather simple: Weak password
that led to someone installing an irc bouncer, which he renamed to
bash so that it would not look out of place in a process listing,
and a bug in a php-based webhosting package that allowed some turkish
hackers to deface a bunch of websites. Nothing exciting ...


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