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Gentoo Linux Security Advisory                           GLSA 200408-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: PuTTY: Pre-authentication arbitrary code execution
      Date: August 05, 2004
      Bugs: #59383
        ID: 200408-04

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Synopsis
========

PuTTY contains a vulnerability allowing a SSH server to execute
arbitrary code on the connecting client.

Background
==========

PuTTY is a free implementation of Telnet and SSH for Win32 and Unix
platforms, along with an xterm terminal emulator.

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

    -------------------------------------------------------------------
     Package         /   Vulnerable   /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/putty        <= 0.54                             >= 0.55

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

PuTTY contains a vulnerability allowing a malicious server to execute
arbitrary code on the connecting client before host key verification.

Impact
======

When connecting to a server using the SSH2 protocol an attacker is able
to execute arbitrary code with the permissions of the user running
PuTTY by sending specially crafted packets to the client during the
authentication process but before host key verification.

Workaround
==========

There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version of PuTTY.

Resolution
==========

All PuTTY users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-misc/putty-0.55"
    # emerge ">=net-misc/putty-0.55"

References
==========

  [ 1 ] PuTTY ChangeLog
        http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

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

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

    http://security.gentoo.org/glsa/glsa-200408-04.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 2004 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/1.0
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