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USN-182-1: X server vulnerability

12 September 2005

X server vulnerability



A local privilege escalation vulnerability has been discovered in the
pixmap allocation handling of the X server. By allocating a huge
pixmap, a local user could trigger an integer overflow that resulted
in a memory allocation that was too small for the requested pixmap.
This resulted in a buffer overflow which could eventually be exploited
to execute arbitrary code with full root privileges.

Update instructions

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

Ubuntu 5.04
  • xserver-xorg -
  • xserver-xfree86 -
Ubuntu 4.10
  • xserver-xorg -
  • xserver-xfree86 -

In general, a standard system update will make all the necessary changes.