USN-2432-1: GNU C Library vulnerabilities

3 December 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

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