USN-2519-1: GNU C Library vulnerabilities

26 February 2015

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

Several security issues were fixed in the GNU C Library.

Software Description

  • glibc - GNU C Library
  • eglibc - GNU C Library

Details

Arnaud Le Blanc discovered that the GNU C Library incorrectly handled file descriptors when resolving DNS queries under high load. This may cause a denial of service in other applications, or an information leak. This issue only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2013-7423)

It was discovered that the GNU C Library incorrectly handled receiving a positive answer while processing the network name when performing DNS resolution. A remote attacker could use this issue to cause the GNU C Library to hang, resulting in a denial of service. (CVE-2014-9402)

Joseph Myers discovered that the GNU C Library wscanf function incorrectly handled memory. A remote attacker could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 14.10. (CVE-2015-1472, CVE-2015-1473)

Update instructions

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

Ubuntu 14.10
libc6 - 2.19-10ubuntu2.3
Ubuntu 14.04 LTS
libc6 - 2.19-0ubuntu6.6
Ubuntu 12.04 LTS
libc6 - 2.15-0ubuntu10.11
Ubuntu 10.04 LTS
libc6 - 2.11.1-0ubuntu7.21

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