[USN-2596-1] Linux kernel vulnerability

[John Johansen]

==========================================================================
Ubuntu Security Notice USN-2596-1
May 05, 2015

linux vulnerability
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

The system could be made to run programs as an administrator.

Software Description:
- linux: Linux kernel

Details:

A race condition between chown() and execve() was discovered in the Linux
kernel. A local attacker could exploit this race by using chown on a
setuid-user-binary to gain administrative privileges.

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-83-generic    3.2.0-83.120
  linux-image-3.2.0-83-generic-pae  3.2.0-83.120
  linux-image-3.2.0-83-highbank   3.2.0-83.120
  linux-image-3.2.0-83-omap       3.2.0-83.120
  linux-image-3.2.0-83-powerpc-smp  3.2.0-83.120
  linux-image-3.2.0-83-powerpc64-smp  3.2.0-83.120
  linux-image-3.2.0-83-virtual    3.2.0-83.120

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
  http://www.ubuntu.com/usn/usn-2596-1
  CVE-2015-3339

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-83.120


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