GLSA 200507-21: fetchmail: Buffer Overflow

A fetchmail update has been released for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200507-21
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http://security.gentoo.org/
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Severity: Normal
Title: fetchmail: Buffer Overflow
Date: July 25, 2005
Bugs: #99865
ID: 200507-21

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Synopsis
=======

fetchmail is susceptible to a buffer overflow resulting in a Denial of Service or arbitrary code execution.

Background
=========

fetchmail is a utility that retrieves and forwards mail from remote systems using IMAP, POP, and other protocols.

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

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Package / Vulnerable / Unaffected
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1 net-mail/fetchmail lt; 6.2.5.2 gt;= 6.2.5.2

Description
==========

fetchmail does not properly validate UIDs coming from a POP3 mail server. The UID is placed in a fixed length buffer on the stack, which can be overflown.

Impact
=====

Very long UIDs returned from a malicious or compromised POP3 server can cause fetchmail to crash, resulting in a Denial of Service, or allow arbitrary code to be placed on the stack.

Workaround
=========

There are no known workarounds at this time.

Resolution
=========

All fetchmail users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=net-mail/fetchmail-6.2.5.2"

References
=========

[ 1 ] Fetchmail Security Advisory
http://fetchmail.berlios.de/fetchmail-SA-2005-01.txt
[ 2 ] CAN-2005-2335
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2335

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

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

http://security.gentoo.org/glsa/glsa-200507-21.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