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X.Org X Server: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201110-19 / xorg-server
Release Date October 22, 2011
Latest Revision October 22, 2011: 2
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
x11-base/xorg-server < 1.10.4-r1 revision >= 1.9.5-r1, >= 1.10.4-r1 All supported architectures

Related bugreports: #387069


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

2.  Impact Information


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


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).


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.

3.  Resolution Information


There is no known workaround at this time.


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

Code Listing 3.1: Resolution

  # 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:

Code Listing 3.2: Resolution

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

4.  References


Page updated October 22, 2011

Summary: This is a Gentoo Linux Security Advisory

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