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[ GLSA 200507-21 ] fetchmail: Buffer Overflow
From: Sune Kloppenborg Jeppesen <jaervosz () gentoo org>
Date: Mon, 25 Jul 2005 19:58:20 +0200

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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
=================

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  net-mail/fetchmail      < 6.2.5.2                      >= 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 ">=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

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