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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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