USN-1792-1: Linux kernel vulnerabilities

8 April 2013

linux vulnerabilities

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

  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Mathias Krause discovered several errors in the Linux kernel’s xfrm_user implementation. A local attacker could exploit these flaws to examine parts of kernel memory. (CVE-2012-6537)

Mathias Krause discovered information leak in the Linux kernel’s compat ioctl interface. A local user could exploit the flaw to examine parts of kernel stack memory (CVE-2012-6539)

Mathias Krause discovered an information leak in the Linux kernel’s getsockopt for IP_VS_SO_GET_TIMEOUT. A local user could exploit this flaw to examine parts of kernel stack memory. (CVE-2012-6540)

Emese Revfy discovered that in the Linux kernel signal handlers could leak address information across an exec, making it possible to by pass ASLR (Address Space Layout Randomization). A local user could use this flaw to by pass ASLR to reliably deliver an exploit payload that would otherwise be stopped (by ASLR). (CVE-2013-0914)

A memory use after free error was discover in the Linux kernel’s tmpfs filesystem. A local user could exploit this flaw to gain privileges or cause a denial of service (system crash). (CVE-2013-1767)

Mateusz Guzik discovered a race in the Linux kernel’s keyring. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-1792)

Update instructions

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

Ubuntu 10.04 LTS
linux-image-2.6.32-46-386 - 2.6.32-46.107
linux-image-2.6.32-46-generic - 2.6.32-46.107
linux-image-2.6.32-46-generic-pae - 2.6.32-46.107
linux-image-2.6.32-46-ia64 - 2.6.32-46.107
linux-image-2.6.32-46-lpia - 2.6.32-46.107
linux-image-2.6.32-46-powerpc - 2.6.32-46.107
linux-image-2.6.32-46-powerpc-smp - 2.6.32-46.107
linux-image-2.6.32-46-powerpc64-smp - 2.6.32-46.107
linux-image-2.6.32-46-preempt - 2.6.32-46.107
linux-image-2.6.32-46-server - 2.6.32-46.107
linux-image-2.6.32-46-sparc64 - 2.6.32-46.107
linux-image-2.6.32-46-sparc64-smp - 2.6.32-46.107
linux-image-2.6.32-46-versatile - 2.6.32-46.107
linux-image-2.6.32-46-virtual - 2.6.32-46.107

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