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Ubuntu: New Linux packages fix security vulnerabilities

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

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.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1312-1
December 19, 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

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

References:
 http://www.ubuntu.com/usn/usn-1312-1
 CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4330

Package Information:
 https://launchpad.net/ubuntu/+source/linux/2.6.38-13.53
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