X.Org X Server: Privilege escalation

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
x11-base/xorg-server	< 1.11.4-r1	>= 1.11.4-r1, revision >= 1.10.6-r1, revision <= 1.9.5-r1	All supported architectures

Related bugreports: #412609

A format string vulnerability in X.Org X Server may allow local privilege escalation or Denial of Service.

2. Impact Information

The X Window System is a graphical windowing system based on a client/server model.

The "LogVHdrMessageVerb()" function in log.c contains a format string vulnerability.

NOTE: Exposure to this vulnerability is reduced in Gentoo due to X.Org X Server being built with "-D_FORTIFY_SOURCE=2" by default.

A local attacker could gain escalated privileges or cause a Denial of Service condition.

3. Resolution Information

There is no known workaround at this time.

All X.Org X Server 1.11.x users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.11.4-r1"

All X.Org X Server 1.10.x users should upgrade to the latest version:

Code Listing 3.2: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.6-r1"

X.Org X Server 1.9.x is not affected.

4. References

Page updated July 09, 2012

Summary: This is a Gentoo Linux Security Advisory

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