USN-1175-1: libpng vulnerabilities

Ubuntu Security Notice USN-1175-1

26th July, 2011

libpng vulnerabilities

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS

Summary

Libpng could be made to run programs as your login if it opened a specially crafted file.

Software description

  • libpng - PNG (Portable Network Graphics) file library

Details

Frank Busse discovered that libpng did not properly handle certain
malformed PNG images. If a user or automated system were tricked into
opening a crafted PNG file, an attacker could cause libpng to crash,
resulting in a denial of service. This issue only affected Ubuntu
10.04 LTS, 10.10, and 11.04. (CVE-2011-2501)

It was discovered that libpng did not properly handle certain malformed PNG
images. If a user or automated system were tricked into opening a crafted
PNG file, an attacker could cause a denial of service or possibly execute
arbitrary code with the privileges of the user invoking the program.
(CVE-2011-2690)

Frank Busse discovered that libpng did not properly handle certain PNG
images with invalid sCAL chunks. If a user or automated system were tricked
into opening a crafted PNG file, an attacker could cause a denial of
service or possibly execute arbitrary code with the privileges of the user
invoking the program. (CVE-2011-2692)

Update instructions

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

Ubuntu 11.04:
libpng12-0 1.2.44-1ubuntu3.1
Ubuntu 10.10:
libpng12-0 1.2.44-1ubuntu0.1
Ubuntu 10.04 LTS:
libpng12-0 1.2.42-1ubuntu2.2
Ubuntu 8.04 LTS:
libpng12-0 1.2.15~beta5-3ubuntu0.4

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

CVE-2011-2501, CVE-2011-2690, CVE-2011-2692