[ GLSA 201207-04 ] X.Org X Server: Privilege escalation

[GLSA]

Gentoo Linux Security Advisory

Title: X.Org X Server: Privilege escalation (GLSA 201207-04)
Severity: high
Exploitable: local
Date: July 09, 2012
Bug(s): #412609
ID: 201207-04

Synopsis

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


Background

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


Affected Packages

Package: x11-base/xorg-server
Vulnerable: < 1.11.4-r1
Unaffected: >= 1.11.4-r1
Unaffected: >= 1.10.6-r1 < 1.10.7
Unaffected: > 1.9.5 <= 1.9.5-r1
Architectures: All supported architectures


Description

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.


Impact

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


Workaround

There is no known workaround at this time.

Resolution

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