[Please upgrade th util-linux package on all distributions -- Raju]
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Subject: [Full-disclosure] [ GLSA 200509-15 ] util-linux: umount command
validation error
Date: Tue, 20 Sep 2005 16:16:54 +0200
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Gentoo Linux Security Advisory GLSA 200509-15
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http://security.gentoo.org/
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Severity: High
Title: util-linux: umount command validation error
Date: September 20, 2005
Bugs: #105805
ID: 200509-15
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Synopsis
========
A command validation error in umount can lead to an escalation of
privileges.
Background
==========
util-linux is a suite of useful Linux programs including umount, a
program used to unmount filesystems.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/util-linux < 2.12q-r3 >= 2.12q-r3
Description
===========
When a regular user mounts a filesystem, they are subject to
restrictions in the /etc/fstab configuration file. David Watson
discovered that when unmounting a filesystem with the '-r' option, the
read-only bit is set, while other bits, such as nosuid or nodev, are
not set, even if they were previously.
Impact
======
An unprivileged user facing nosuid or nodev restrictions can umount -r
a filesystem clearing those bits, allowing applications to be executed
suid, or have device nodes interpreted. In the case where the user can
freely modify the contents of the filesystem, privilege escalation may
occur as a custom program may execute with suid permissions.
Workaround
==========
Two workarounds exist, first, the suid bit can be removed from the
umount utility, or users can be restricted from mounting and unmounting
filesystems in /etc/fstab.
Resolution
==========
All util-linux users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.12q-r3"
References
==========
[ 1 ] CAN-2005-2876
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2005-2876
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200509-15.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of ternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
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******************
--
Raj Mathur [EMAIL PROTECTED] http://kandalaya.org/
GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F
It is the mind that moves
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