Ubuntu Security Notice USN-2568-1
13th April, 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
- libx11
– X11 client-side library - libxrender
– X11 Rendering Extension client 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 version:
- 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
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.