USN-1787-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1787-1

2nd April, 2013

linux vulnerabilities

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

  • Ubuntu 11.10

Summary

Several security issues were fixed in the kernel.

Software description

  • linux - Linux kernel

Details

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 version:

Ubuntu 11.10:
linux-image-3.0.0-32-powerpc64-smp 3.0.0-32.51
linux-image-3.0.0-32-omap 3.0.0-32.51
linux-image-3.0.0-32-generic 3.0.0-32.51
linux-image-3.0.0-32-server 3.0.0-32.51
linux-image-3.0.0-32-powerpc-smp 3.0.0-32.51
linux-image-3.0.0-32-virtual 3.0.0-32.51
linux-image-3.0.0-32-powerpc 3.0.0-32.51
linux-image-3.0.0-32-generic-pae 3.0.0-32.51

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-2013-0914, CVE-2013-1767, CVE-2013-1792