USN-2815-1: libpng vulnerabilities

Ubuntu Security Notice USN-2815-1

19th November, 2015

libpng vulnerabilities

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

• Ubuntu 15.10
• Ubuntu 15.04
• Ubuntu 14.04 LTS
• Ubuntu 12.04 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

Mikulas Patocka discovered that libpng incorrectly handled certain large
fields. If a user or automated system using libpng were tricked into
opening a specially crafted image, an attacker could exploit this to cause
libpng to crash, leading to a denial of service. This issue only affected
Ubuntu 12.04 LTS. (CVE-2012-3425)

Qixue Xiao discovered that libpng incorrectly handled certain time values.
If a user or automated system using libpng were tricked into opening a
specially crafted image, an attacker could exploit this to cause libpng to
crash, leading to a denial of service. (CVE-2015-7981)

It was discovered that libpng incorrectly handled certain small bit-depth
values. 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-2015-8126)

Update instructions

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

Ubuntu 15.10:

libpng12-0 1.2.51-0ubuntu3.15.10.1

Ubuntu 15.04:

libpng12-0 1.2.51-0ubuntu3.15.04.1

Ubuntu 14.04 LTS:

libpng12-0 1.2.50-1ubuntu2.14.04.1

Ubuntu 12.04 LTS:

libpng12-0 1.2.46-3ubuntu4.1

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

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

References

CVE-2012-3425, CVE-2015-7981, CVE-2015-8126