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Ubuntu Security Notice USN-3500-1
November 29, 2017

libxfont, libxfont1, libxfont2 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 17.10
– Ubuntu 17.04
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

libXfont could be made to access arbitrary files, including special device
files.

Software Description:
– libxfont: X11 font rasterisation library
– libxfont1: X11 font rasterisation library
– libxfont2: X11 font rasterisation library

Details:

It was discovered that libXfont incorrectly followed symlinks when opening
font files. A local unprivileged user could use this issue to cause the X
server to access arbitrary files, including special device files.

Update instructions:

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

Ubuntu 17.10:
libxfont1 1:1.5.2-4ubuntu1.1
libxfont2 1:2.0.1-3ubuntu1.1

Ubuntu 17.04:
libxfont1 1:1.5.2-4ubuntu0.2
libxfont2 1:2.0.1-3ubuntu0.2

Ubuntu 16.04 LTS:
libxfont1 1:1.5.1-1ubuntu0.16.04.4
libxfont2 1:2.0.1-3~ubuntu16.04.3

Ubuntu 14.04 LTS:
libxfont1 1:1.4.7-1ubuntu0.4

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

References:
https://www.ubuntu.com/usn/usn-3500-1
CVE-2017-16611

Package Information:
https://launchpad.net/ubuntu/+source/libxfont/1:2.0.1-3ubuntu1.1
https://launchpad.net/ubuntu/+source/libxfont1/1:1.5.2-4ubuntu1.1
https://launchpad.net/ubuntu/+source/libxfont/1:2.0.1-3ubuntu0.2
https://launchpad.net/ubuntu/+source/libxfont1/1:1.5.2-4ubuntu0.2
https://launchpad.net/ubuntu/+source/libxfont/1:1.5.1-1ubuntu0.16.04.4
https://launchpad.net/ubuntu/+source/libxfont2/1:2.0.1-3~ubuntu16.04.3
https://launchpad.net/ubuntu/+source/libxfont/1:1.4.7-1ubuntu0.4

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