Ubuntu 14.04 LTS: 2568-1 Moderate: libx11 Denial Of Service

ubuntu

April 13, 2015

libx11 could be made to crash or run programs if it processed specially crafted data.

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.

Topics Covered

security advisory moderate denial of service ubuntu libx11

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.