[USN-2432-1] GNU C Library vulnerabilities

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-2432-1
December 03, 2014

eglibc, glibc vulnerabilities
==========================================================================

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

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

The GNU C Library could be made to crash or run programs.

Software Description:
- glibc: GNU C Library
- eglibc: GNU C Library

Details:

Siddhesh Poyarekar discovered that the GNU C Library incorrectly handled
certain multibyte characters when using the iconv function. An attacker
could possibly use this issue to cause applications to crash, resulting in
a denial of service. This issue only affected Ubuntu 10.04 LTS and Ubuntu
12.04 LTS. (CVE-2012-6656)

Adhemerval Zanella Netto discovered that the GNU C Library incorrectly
handled certain multibyte characters when using the iconv function. An
attacker could possibly use this issue to cause applications to crash,
resulting in a denial of service. (CVE-2014-6040)

Tim Waugh discovered that the GNU C Library incorrectly enforced the
WRDE_NOCMD flag when handling the wordexp function. An attacker could
possibly use this issue to execute arbitrary commands. (CVE-2014-7817)

Update instructions:

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

Ubuntu 14.10:
  libc6                           2.19-10ubuntu2.1

Ubuntu 14.04 LTS:
  libc6                           2.19-0ubuntu6.4

Ubuntu 12.04 LTS:
  libc6                           2.15-0ubuntu10.9

Ubuntu 10.04 LTS:
  libc6                           2.11.1-0ubuntu7.19

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

References:
  http://www.ubuntu.com/usn/usn-2432-1
  CVE-2012-6656, CVE-2014-6040, CVE-2014-7817

Package Information:
  https://launchpad.net/ubuntu/+source/glibc/2.19-10ubuntu2.1
  https://launchpad.net/ubuntu/+source/eglibc/2.19-0ubuntu6.4
  https://launchpad.net/ubuntu/+source/eglibc/2.15-0ubuntu10.9
  https://launchpad.net/ubuntu/+source/eglibc/2.11.1-0ubuntu7.19


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