Gentoo Logo

X.Org X Server: Multiple vulnerabilities

Content:

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

Synopsis

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

2.  Impact Information

Background

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

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.

3.  Resolution Information

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:

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



Print

Page updated October 22, 2011

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2014 Gentoo Foundation, Inc. Questions, Comments? Contact us.