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Gentoo Linux Security Advisory                           GLSA 200806-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: rdesktop: Multiple vulnerabilities
      Date: June 14, 2008
      Bugs: #220911
        ID: 200806-04

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Synopsis
========

Multiple vulnerabilities in rdesktop may lead to the execution of
arbitrary code or a Denial of Service.

Background
==========

rdesktop is an open source Remote Desktop Protocol (RDP) client.

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

    -------------------------------------------------------------------
     Package            /  Vulnerable  /                    Unaffected
    -------------------------------------------------------------------
  1  net-misc/rdesktop       < 1.6.0                          >= 1.6.0

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

An anonymous researcher reported multiple vulnerabilities in rdesktop
via iDefense Labs:

* An integer underflow error exists in the function iso_recv_msg() in
  the file iso.c which can be triggered via a specially crafted RDP
  request, causing a heap-based buffer overflow (CVE-2008-1801).

* An input validation error exists in the function
  process_redirect_pdu() in the file rdp.c which can be triggered via a
  specially crafted RDP redirect request, causing a BSS-based buffer
  overflow (CVE-2008-1802).

* An integer signedness error exists in the function xrealloc() in
  the file rdesktop.c which can be be exploited to cause a heap-based
  buffer overflow (CVE-2008-1803).

Impact
======

An attacker could exploit these vulnerabilities by enticing a user to
connect to a malicious RDP server thereby allowing the attacker to
execute arbitrary code or cause a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All rdesktop users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/rdesktop-1.6.0"

References
==========

  [ 1 ] CVE-2008-1801
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1801
  [ 2 ] CVE-2008-1802
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1802
  [ 3 ] CVE-2008-1803
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1803

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

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

  http://security.gentoo.org/glsa/glsa-200806-04.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 2008 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
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