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Gentoo Linux Security Advisory                           GLSA 201703-03
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: PuTTY: Buffer overflow
     Date: March 19, 2017
     Bugs: #610552
       ID: 201703-03

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Synopsis
========

A buffer overflow in PuTTY might allow remote attackers to execute
arbitrary code or cause a denial of service.

Background
==========

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

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/putty                < 0.68                     >= 0.68

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

A heap-corrupting buffer overflow bug in the ssh_agent_channel_data
function of PuTTY was found.

Impact
======

A remote attacker, utilizing the SSH agent forwarding of an SSH server,
could execute arbitrary code with the privileges of the user running
the client or cause a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PuTTY users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/putty-0.68"

References
==========

[ 1 ] CVE-2017-6542
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-6542

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

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

 https://security.gentoo.org/glsa/201703-03

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
https://bugs.gentoo.org.

License
=======

Copyright 2017 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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