[USN-3442-1] libXfont vulnerabilities

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=v7LA
-----END PGP SIGNATURE-----
==========================================================================
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