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CVE-2011-4029

Status Candidate

Overview

The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to change the permissions of arbitrary files to 444, read those files, and possibly cause a denial of service (removed execution permission) via a symlink attack on a temporary lock file.

Related Files

Red Hat Security Advisory 2012-0939-04
Posted Jun 20, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0939-04 - X.Org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. A flaw was found in the way the X.Org server handled lock files. A local user with access to the system console could use this flaw to determine the existence of a file in a directory not accessible to the user, via a symbolic link attack. A race condition was found in the way the X.Org server managed temporary lock files. A local attacker could use this flaw to perform a symbolic link attack, allowing them to make an arbitrary file world readable, leading to the disclosure of sensitive information.

tags | advisory, arbitrary, local
systems | linux, redhat
advisories | CVE-2011-4028, CVE-2011-4029
MD5 | 960725476cdf6e186b95b06971ce3b4e
X.org File Permission Change Proof Of Concept
Posted Dec 16, 2011
Authored by vladz

This proof of concept exploit sets permissions to 444 on an arbitrary file specified as an argument by leveraging SIGSTOP/SIGCONT signals and the Inotify API to win a race condition in X.

tags | exploit, arbitrary, proof of concept
advisories | CVE-2011-4029
MD5 | d7889dfc7832195d218e19a0f8a34822
Gentoo Linux Security Advisory 201110-19
Posted Oct 23, 2011
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201110-19 - Multiple vulnerabilities in the X.Org X server might allow local attackers to disclose information. Versions less than 1.10.4-r1 are affected.

tags | advisory, local, vulnerability
systems | linux, gentoo
advisories | CVE-2011-4028, CVE-2011-4029
MD5 | 6fbed75e8d858eff39d6fbe169059d94
Ubuntu Security Notice USN-1232-1
Posted Oct 18, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1232-1 - It was discovered that the X server incorrectly handled certain malformed input. An authorized attacker could exploit this to cause the X server to crash, leading to a denial or service, or possibly execute arbitrary code with root privileges. This issue only affected Ubuntu 10.04 LTS and 10.10. It was discovered that the X server incorrectly handled certain malformed input. An authorized attacker could exploit this to cause the X server to crash, leading to a denial or service, or possibly read arbitrary data from the X server process. This issue only affected Ubuntu 10.04 LTS. Various other issues were also addressed.

tags | advisory, arbitrary, root
systems | linux, ubuntu
advisories | CVE-2010-4818, CVE-2010-4819, CVE-2011-4028, CVE-2011-4029
MD5 | 07c255a807b2ef2512f9e255b336157d
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