==========================================================================
Ubuntu Security Notice USN-2568-1
April 13, 2015
libx11, libxrender vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.10
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS
Summary:
libx11 could be made to crash or run programs if it processed specially
crafted data.
Software Description:
– libxrender: X11 Rendering Extension client library
– libx11: X11 client-side library
Details:
Abhishek Arya discovered that libX11 incorrectly handled memory in the
MakeBigReq macro. A remote attacker could use this issue to cause
applications to crash, resulting in a denial of service, or possibly
execute arbitrary code.
In addition, following the macro fix in libx11, a number of other packages
have also been rebuilt as security updates including libxrender, libxext,
libxi, libxfixes, libxrandr, libsdl1.2, libxv, libxp, and
xserver-xorg-video-vmware.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.10:
libxrender1 1:0.9.8-1build0.14.10.1
Ubuntu 14.04 LTS:
libxrender1 1:0.9.8-1build0.14.04.1
Ubuntu 12.04 LTS:
libx11-dev 2:1.4.99.1-0ubuntu2.3
libxrender1 1:0.9.6-2ubuntu0.2
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-2568-1
CVE-2013-7439
Package Information:
https://launchpad.net/ubuntu/+source/libxrender/1:0.9.8-1build0.14.10.1
https://launchpad.net/ubuntu/+source/libxrender/1:0.9.8-1build0.14.04.1
https://launchpad.net/ubuntu/+source/libx11/2:1.4.99.1-0ubuntu2.3
https://launchpad.net/ubuntu/+source/libxrender/1:0.9.6-2ubuntu0.2
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