linux vulnerabilities

19 December 2011

linux vulnerabilities

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

• Ubuntu 11.04

Summary

Several security issues were fixed in the kernel.

Software Description

• linux - Linux kernel

Details

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)

Nick Bowler discovered the kernel GHASH message digest algorithm incorrectly handled error conditions. A local attacker could exploit this to cause a kernel oops. (CVE-2011-4081)

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)

Update instructions

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

Ubuntu 11.04

linux-image-2.6.38-13-generic - 2.6.38-13.53

linux-image-2.6.38-13-generic-pae - 2.6.38-13.53

linux-image-2.6.38-13-omap - 2.6.38-13.53

linux-image-2.6.38-13-powerpc - 2.6.38-13.53

linux-image-2.6.38-13-powerpc-smp - 2.6.38-13.53

linux-image-2.6.38-13-powerpc64-smp - 2.6.38-13.53

linux-image-2.6.38-13-server - 2.6.38-13.53

linux-image-2.6.38-13-versatile - 2.6.38-13.53

linux-image-2.6.38-13-virtual - 2.6.38-13.53

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

• CVE-2011-4077
• CVE-2011-4081
• CVE-2011-4132
• CVE-2011-4330