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Gentoo: GLSA-201110-19 Moderate: X.Org X Server Memory Disclosure

gentoo
Calendar Grey October 22, 2011
Dist Gentoo Esm H88
Several security flaws in Gentoo's X.Org X server might enable local adversaries to access confidential data.
Multiple vulnerabilities in the X.Org X server might allow local attackers to disclose information.

Summary

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).

Topics%20covered

Topics Covered

security advisory gentoo memory leak local attack information exposure

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

[ 1 ] CVE-2011-4028 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4028 [ 2 ] CVE-2011-4029 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4029

Availability

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

Severity: Normal
Title: X.Org X Server: Multiple vulnerabilities
Date: October 22, 2011
Bugs: #387069
ID: 201110-19

Topics%20covered

Topics Covered

security advisory gentoo memory leak local attack information exposure

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 x11-base/xorg-server < 1.10.4-r1 *>= 1.9.5-r1 >= 1.10.4-r1

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.

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