GLSA 200502-28: PuTTY: Remote code execution
Posted on: 02/21/2005 04:59 PM

A PuTTY security update has been released for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200502-28
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http://security.gentoo.org/
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Severity: Normal
Title: PuTTY: Remote code execution
Date: February 21, 2005
Bugs: #82753
ID: 200502-28

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Synopsis
=======

PuTTY was found to contain vulnerabilities that can allow a malicious SFTP server to execute arbitrary code on unsuspecting PSCP and PSFTP clients.

Background
=========

PuTTY is a popular SSH client, PSCP is a secure copy implementation, and PSFTP is a SSH File Transfer Protocol client.

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

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Package / Vulnerable / Unaffected
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1 net-misc/putty < 0.57 >= 0.57

Description
==========

Two vulnerabilities have been discovered in the PSCP and PSFTP clients, which can be triggered by the SFTP server itself. These issues are caused by the improper handling of the FXP_READDIR response, along with other string fields.

Impact
=====

An attacker can setup a malicious SFTP server that would send these malformed responses to a client, potentially allowing the execution of arbitrary code on their system.

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-0.57"

References
=========

[ 1 ] PuTTY vulnerability vuln-sftp-readdir
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-sftp-readdir.html
[ 2 ] PuTTY vulnerability vuln-sftp-string
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-sftp-string.html
[ 3 ] CAN-2005-0467
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0467
[ 4 ] iDEFENSE Advisory
http://www.idefense.com/application/poi/display?id
1type=vulnerabilities

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

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

http://security.gentoo.org/glsa/glsa-200502-28.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 2005 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/2.0


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