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Ubuntu Security Notice USN-3500-1

Ubuntu Security Notice USN-3500-1
Posted Nov 29, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3500-1 - 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.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2017-16611
SHA-256 | b53da59663327cdf80b5b7d9f88bd1b1f437c9713750218a9ffa0d56f2f3808f

Ubuntu Security Notice USN-3500-1

Change Mirror Download

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

libxfont, libxfont1, libxfont2 vulnerability
===========================================================================

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



--WJ7JgBuTe6ORGBWdaBhK9frScHNpf32qD--

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