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Gentoo Linux Security Advisory                           GLSA 200705-10
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                                            http://security.gentoo.org/
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  Severity: High
     Title: LibXfont, TightVNC: Multiple vulnerabilities
      Date: May 08, 2007
      Bugs: #172575, #174200
        ID: 200705-10

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Synopsis
========

Multiple vulnerabilities have been reported in libXfont and TightVNC,
allowing for the execution of arbitrary code with root privileges.

Background
==========

LibXfont is the X.Org font library. TightVNC is a VNC client/server for
X displays.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  net-misc/tightvnc     < 1.2.9-r4                      >= 1.2.9-r4
  2  x11-libs/libXfont     < 1.2.7-r1                      >= 1.2.7-r1
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

Description
===========

The libXfont code is prone to several integer overflows, in functions
ProcXCMiscGetXIDList(), bdfReadCharacters() and FontFileInitTable().
TightVNC contains a local copy of this code and is also affected.

Impact
======

A local attacker could use a specially crafted BDF Font to gain root
privileges on the vulnerable host.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libXfont users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=x11-libs/libXfont-1.2.7-r1"

All TightVNC users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/tightvnc-1.2.9-r4"

References
==========

  [ 1 ] CVE-2007-1003
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1003
  [ 2 ] CVE-2007-1351
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1351
  [ 3 ] CVE-2007-1352
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1352

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200705-10.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5