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[ GLSA 201207-04 ] X.Org X Server: Privilege escalation
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PostPosted: Tue Jul 10, 2012 2:26 am    Post subject: [ GLSA 201207-04 ] X.Org X Server: Privilege escalation Reply with quote

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:
Code:
# 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:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.10.6-r1"
   
X.Org X Server 1.9.x is not affected.

References

CVE-2012-2118
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