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.
056bbb8f9c917f5519bbd54df7dac67565efe3792cceacb35765ad54e8033a0fThis 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.
0ea22872b6b51bf5249b0a70a12ebe97e3272ad611f24a936335036486484018Gentoo 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.
609832a138e154288bb1dbf8b4f5cc7bfd03135dd2be9fdcf641657ed8183c62Ubuntu 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.
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