GLSA 201110-19: X.Org X Server: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	X.Org X Server: Multiple vulnerabilities
Date:	10/22/2011
Bugs:	#387069
ID:	201110-19

Synopsis

Multiple vulnerabilities in the X.Org X server might allow local attackers to disclose information.

Background

The X Window System is a graphical windowing system based on a client/server model.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
x11-base/xorg-server	< 1.10.4-r1	>= 1.9.5-r1	All supported architectures

Description

vladz reported the following vulnerabilities in the X.Org X server:

The X.Org X server follows symbolic links when trying to access the lock file for a X display, showing a predictable behavior depending on the file type of the link target (CVE-2011-4028).
The X.Org X server lock file mechanism allows for a race condition to cause the X server to modify the file permissions of an arbitrary file to 0444 (CVE-2011-4029).

Impact

A local attacker could exploit these vulnerabilities to disclose information by making arbitrary files on a system world-readable or gain information whether a specified file exists on the system and whether it is a file, directory, or a named pipe.

Workaround

There is no known workaround at this time.

Resolution

All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.9.5-r1"

All X.Org X Server 1.10 users should upgrade to the latest version:


      # emerge --sync
      # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.4-r1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201110-19.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.