USN-1336-1: Linux kernel vulnerability

23 January 2012

linux vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 11.10

Summary

The system could be made to run programs as an administrator.

Software Description

  • linux - Linux kernel

Details

Clement Lecigne discovered a bug in the HFS filesystem. A local attacker could exploit this to cause a kernel oops. (CVE-2011-2203)

A bug was discovered in the XFS filesystem’s handling of pathnames. A local attacker could exploit this to crash the system, leading to a denial of service, or gain root privileges. (CVE-2011-4077)

A flaw was found in how the Linux kernel handles user-defined key types. An unprivileged local user could exploit this to crash the system. (CVE-2011-4110)

A flaw was found in the Journaling Block Device (JBD). A local attacker able to mount ext3 or ext4 file systems could exploit this to crash the system, leading to a denial of service. (CVE-2011-4132)

Clement Lecigne discovered a bug in the HFS file system bounds checking. When a malformed HFS file system is mounted a local user could crash the system or gain root privileges. (CVE-2011-4330)

Chen Haogang discovered an integer overflow that could result in memory corruption. A local unprivileged user could use this to crash the system. (CVE-2012-0044)

Jüri Aedla discovered that the kernel incorrectly handled /proc/<pid>/mem permissions. A local attacker could exploit this and gain root privileges. (CVE-2012-0056)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.10
linux-image-3.0.0-15-generic - 3.0.0-15.26
linux-image-3.0.0-15-generic-pae - 3.0.0-15.26
linux-image-3.0.0-15-omap - 3.0.0-15.26
linux-image-3.0.0-15-powerpc - 3.0.0-15.26
linux-image-3.0.0-15-powerpc-smp - 3.0.0-15.26
linux-image-3.0.0-15-powerpc64-smp - 3.0.0-15.26
linux-image-3.0.0-15-server - 3.0.0-15.26
linux-image-3.0.0-15-virtual - 3.0.0-15.26

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

References