[USN-1787-1] Linux kernel vulnerabilities

[John Johansen]

==========================================================================
Ubuntu Security Notice USN-1787-1
April 02, 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 bypass 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 memoery 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 11.10:
  linux-image-3.0.0-32-generic    3.0.0-32.51
  linux-image-3.0.0-32-generic-pae  3.0.0-32.51
  linux-image-3.0.0-32-omap       3.0.0-32.51
  linux-image-3.0.0-32-powerpc    3.0.0-32.51
  linux-image-3.0.0-32-powerpc-smp  3.0.0-32.51
  linux-image-3.0.0-32-powerpc64-smp  3.0.0-32.51
  linux-image-3.0.0-32-server     3.0.0-32.51
  linux-image-3.0.0-32-virtual    3.0.0-32.51

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

References:
  http://www.ubuntu.com/usn/usn-1787-1
  CVE-2013-0914, CVE-2013-1767, CVE-2013-1792

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.0.0-32.51

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