USN-3442-1: libXfont vulnerabilities

Releases

• Ubuntu 17.04
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• libxfont - X11 font rasterisation library
• libxfont1 - X11 font rasterisation library
• libxfont2 - X11 font rasterisation library

Details

It was discovered that libXfont incorrectly handled certain patterns in
PatternMatch. A local attacker could use this issue to cause libXfont to
crash, resulting in a denial of service, or possibly obtain sensitive
information. (CVE-2017-13720)

It was discovered that libXfont incorrectly handled certain malformed PCF
files. A local attacker could use this issue to cause libXfont to crash,
resulting in a denial of service, or possibly obtain sensitive information.
(CVE-2017-13722)

Update instructions

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

Ubuntu 17.04

• libxfont1 - 1:1.5.2-4ubuntu0.1
• libxfont2 - 1:2.0.1-3ubuntu0.1

Ubuntu 16.04

• libxfont1 - 1:1.5.1-1ubuntu0.16.04.3
• libxfont2 - 1:2.0.1-3~ubuntu16.04.2

Ubuntu 14.04

• libxfont1 - 1:1.4.7-1ubuntu0.3

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2017-13720
• CVE-2017-13722