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Ubuntu: New libpng packages fix security vulnerabilities

It was discovered that libpng did not properly verify the embedded profile length of iCCP chunks. An attacker could exploit this to cause a denial of service via application crash. This issue only affected Ubuntu 8.04 LTS. Jueri Aedla discovered that libpng did not properly verify the size used when allocating memory during chunk decompression. If a user or automated system using libpng were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or execute code with the privileges of the user invoking the program.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1367-1
February 16, 2012

libpng vulnerabilities
==========================================================================

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

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

Software Description:
- libpng: PNG (Portable Network Graphics) file library

Details:

It was discovered that libpng did not properly verify the embedded profile
length of iCCP chunks. An attacker could exploit this to cause a denial of
service via application crash. This issue only affected Ubuntu 8.04 LTS.
(CVE-2009-5063)

Jueri Aedla discovered that libpng did not properly verify the size used
when allocating memory during chunk decompression. If a user or automated
system using libpng were tricked into opening a specially crafted image,
an attacker could exploit this to cause a denial of service or execute
code with the privileges of the user invoking the program. (CVE-2011-3026)

Update instructions:

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

Ubuntu 11.10:
 libpng12-0                      1.2.46-3ubuntu1.1

Ubuntu 11.04:
 libpng12-0                      1.2.44-1ubuntu3.2

Ubuntu 10.10:
 libpng12-0                      1.2.44-1ubuntu0.2

Ubuntu 10.04 LTS:
 libpng12-0                      1.2.42-1ubuntu2.3

Ubuntu 8.04 LTS:
 libpng12-0                      1.2.15~beta5-3ubuntu0.5

After a standard system update you need to restart your session to make
all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1367-1
 CVE-2009-5063, CVE-2011-3026

Package Information:
 https://launchpad.net/ubuntu/+source/libpng/1.2.46-3ubuntu1.1
 https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu3.2
 https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu0.2
 https://launchpad.net/ubuntu/+source/libpng/1.2.42-1ubuntu2.3
 https://launchpad.net/ubuntu/+source/libpng/1.2.15~beta5-3ubuntu0.5
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