USN-730-1: libpng vulnerabilities

Ubuntu Security Notice USN-730-1

5th March, 2009

libpng vulnerabilities

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

  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 7.10
  • Ubuntu 6.06 LTS

Software description

  • libpng

Details

It was discovered that libpng did not properly perform bounds checking in
certain operations. An attacker could send a specially crafted PNG image and
cause a denial of service in applications linked against libpng. This issue
only affected Ubuntu 8.04 LTS. (CVE-2007-5268, CVE-2007-5269)

Tavis Ormandy discovered that libpng did not properly initialize memory. If a
user or automated system were tricked into opening a crafted PNG image, an
attacker could cause a denial of service via application crash, or possibly
execute arbitrary code with the privileges of the user invoking the program.
This issue did not affect Ubuntu 8.10. (CVE-2008-1382)

Harald van Dijk discovered an off-by-one error in libpng. An attacker could
could cause an application crash in programs using pngtest. (CVE-2008-3964)

It was discovered that libpng did not properly NULL terminate a keyword
string. An attacker could exploit this to set arbitrary memory locations to
zero. (CVE-2008-5907)

Glenn Randers-Pehrson discovered that libpng did not properly initialize
pointers. 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-2009-0040)

Update instructions

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

Ubuntu 8.10:
libpng12-0 1.2.27-1ubuntu0.1
Ubuntu 8.04 LTS:
libpng12-0 1.2.15~beta5-3ubuntu0.1
Ubuntu 7.10:
libpng12-0 1.2.15~beta5-2ubuntu0.2
Ubuntu 6.06 LTS:
libpng12-0 1.2.8rel-5ubuntu0.4

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

References

CVE-2007-5268, CVE-2007-5269, CVE-2008-1382, CVE-2008-3964, CVE-2008-5907, CVE-2009-0040