USN-869-1: Linux kernel vulnerabilities

10 December 2009

linux vulnerability

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

  • Ubuntu 9.10

Software Description

  • linux

Details

David Ford discovered that the IPv4 defragmentation routine did not correctly handle oversized packets. A remote attacker could send specially crafted traffic that would cause a system to crash, leading to a denial of service. (The fix was included in the earlier kernels from USN-864-1.) (CVE-2009-1298)

Akira Fujita discovered that the Ext4 “move extents” ioctl did not correctly check permissions. A local attacker could exploit this to overwrite arbitrary files on the system, leading to root privilege escalation. (CVE-2009-4131)

Update instructions

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

Ubuntu 9.10
linux-image-2.6.31-16-386 - 2.6.31-16.53
linux-image-2.6.31-16-generic - 2.6.31-16.53
linux-image-2.6.31-16-generic-pae - 2.6.31-16.53
linux-image-2.6.31-16-ia64 - 2.6.31-16.53
linux-image-2.6.31-16-lpia - 2.6.31-16.53
linux-image-2.6.31-16-powerpc - 2.6.31-16.53
linux-image-2.6.31-16-powerpc-smp - 2.6.31-16.53
linux-image-2.6.31-16-powerpc64-smp - 2.6.31-16.53
linux-image-2.6.31-16-server - 2.6.31-16.53
linux-image-2.6.31-16-sparc64 - 2.6.31-16.53
linux-image-2.6.31-16-sparc64-smp - 2.6.31-16.53
linux-image-2.6.31-16-virtual - 2.6.31-16.53

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

After a standard system upgrade you need to reboot your computer to effect the necessary changes.

References