Ubuntu Security Notice USN-2861-1
6th January, 2016
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
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-2015-8472)
Qixue Xiao and Chen Yu discovered that libpng incorrectly handled certain
malformed images. 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. (CVE-2015-8540)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 15.10:
-
libpng12-0
1.2.51-0ubuntu3.15.10.2
- Ubuntu 15.04:
-
libpng12-0
1.2.51-0ubuntu3.15.04.2
- Ubuntu 14.04 LTS:
-
libpng12-0
1.2.50-1ubuntu2.14.04.2
- Ubuntu 12.04 LTS:
-
libpng12-0
1.2.46-3ubuntu4.2
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
Source: ubuntu-usn
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