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Ubuntu Security Notice USN-3442-1
October 10, 2017

libxfont, libxfont1, libxfont2 vulnerabilities
==========================================================================

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

- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libXfont.

Software Description:
- 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 LTS:
  libxfont1                       1:1.5.1-1ubuntu0.16.04.3
  libxfont2                       1:2.0.1-3~ubuntu16.04.2

Ubuntu 14.04 LTS:
  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:
  https://www.ubuntu.com/usn/usn-3442-1
  CVE-2017-13720, CVE-2017-13722

Package Information:
  https://launchpad.net/ubuntu/+source/libxfont/1:2.0.1-3ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxfont1/1:1.5.2-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxfont/1:1.5.1-1ubuntu0.16.04.3
  https://launchpad.net/ubuntu/+source/libxfont2/1:2.0.1-3~ubuntu16.04.2
  https://launchpad.net/ubuntu/+source/libxfont/1:1.4.7-1ubuntu0.3