USN-1589-1: GNU C Library vulnerabilities

2 October 2012

eglibc, glibc vulnerabilities

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS

Summary

Multiple security issues were fixed in the GNU C Library.

Software Description

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

Details

It was discovered that positional arguments to the printf() family of functions were not handled properly in the GNU C Library. An attacker could possibly use this to cause a stack-based buffer overflow, creating a denial of service or possibly execute arbitrary code. (CVE-2012-3404, CVE-2012-3405, CVE-2012-3406)

It was discovered that multiple integer overflows existed in the strtod(), strtof() and strtold() functions in the GNU C Library. An attacker could possibly use this to trigger a stack-based buffer overflow, creating a denial of service or possibly execute arbitrary code. (CVE-2012-3480)

Update instructions

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

Ubuntu 12.04 LTS
libc6 - 2.15-0ubuntu10.2
Ubuntu 11.10
libc6 - 2.13-20ubuntu5.2
Ubuntu 11.04
libc6 - 2.13-0ubuntu13.2
Ubuntu 10.04 LTS
libc6 - 2.11.1-0ubuntu7.11
Ubuntu 8.04 LTS
libc6 - 2.7-10ubuntu8.2

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