[SECURITY] [DTSA-27-1] New fuse packages fix potential data corruption when installed seduid root

[maulkin at mx0.halon.org.uk (Neil McGovern)]

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Debian Testing Security Advisory DTSA-27-1             Janurary 20th, 2006
secure-testing-team@lists.alioth.debian.org                  Neil McGovern
http://secure-testing-master.debian.net/
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Package        : fuse
Vulnerability  : potential data corruption when installed seduid root
Problem-Scope  : local
Debian-specific: No
CVE ID         : CVE-2005-3531 

Thomas Biege discovered that fusermount in FUSE before 2.4.1, if installed
setuid root, allows local users to corrupt /etc/mtab and possibly modify mount
options by performing a mount over a directory whose name contains certain
special characters

Successful exploitation could result in a denial of service if mount options
become unusable. An attacker can also exploit this issue to add arbitrary mount
points that could grant the attacker read and possibly write access to
otherwise restricted or privileged mount points. Other attacks are also
possible.

For the testing distribution (etch) this is fixed in version
2.3.0-4.2etch1

For the unstable distribution (sid) this is fixed in version
2.4.1-0.1

This upgrade is recommended if you use fuse.

The Debian testing security team does not track security issues for the
stable (sarge) and oldstable (woody) distributions. If stable is vulnerable,
the Debian security team will make an announcement once a fix is ready.

Upgrade Instructions
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To use the Debian testing security archive, add the following lines to
your /etc/apt/sources.list:

deb http://secure-testing.debian.net/debian-secure-testing etch/security-updates main contrib non-free
deb-src http://secure-testing.debian.net/debian-secure-testing etch/security-updates main contrib non-free

Run the following command as root to make apt trust this repository:

wget http://secure-testing-master.debian.net/ziyi-2005-7.asc -O - | sudo apt-key add -

To install the update, run this command as root:

apt-get update && apt-get upgrade

For further information about the Debian testing security team, please refer
to http://secure-testing-master.debian.net/
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