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fetchmail-SA-2006-03: crash when refusing message delivered through MDA

Topics: fetchmail crashes when refusing a message bound for an MDA

Author: Matthias Andree
Version: 1.0
Announced: 2007-01-04
Type: denial of service
Impact: fetchmail aborts prematurely
Danger: low
Credits: Neil Hoggarth (bug report and analysis)
CVE Name: CVE-2006-5974
URL: http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
Project URL: http://fetchmail.berlios.de/

Affects: fetchmail release = 6.3.5
fetchmail release candidates 6.3.6-rc1, -rc2

Not affected: fetchmail release 6.3.6

Corrected: 2006-11-14 fetchmail SVN

0. Release history
   ==================

2006-11-19 - internal review draft
2007-01-04 1.0 ready for release

1. Background
   =============

fetchmail is a software package to retrieve mail from remote POP2, POP3,
IMAP, ETRN or ODMR servers and forward it to local SMTP, LMTP servers or
message delivery agents.

fetchmail ships with a graphical, Python/Tkinter based configuration
utility named "fetchmailconf" to help the user create configuration (run
control) files for fetchmail.

2. Problem description and Impact
   =================================

Fetchmail 6.3.5 and early 6.3.6 release candidates, when delivering
messages to a message delivery agent by means of the "mda" option, can
crash (by passing a NULL pointer to ferror() and fflush()) when refusing
a message. SMTP and LMTP delivery modes aren't affected.

3. Workaround
   =============

Avoid the mda option and ship to a local SMTP or LMTP server instead.

4. Solution
   ===========

Download and install fetchmail 6.3.6 or a newer stable release from
fetchmail's project site at
<http://developer.berlios.de/project/showfiles.php?group_id=1824&gt;.

A. Copyright, License and Warranty

(C) Copyright 2007 by Matthias Andree, <[email protected]>.
Some rights reserved.

This work is licensed under the Creative Commons
Attribution-NonCommercial-NoDerivs German License. To view a copy of
this license, visit http://creativecommons.org/licenses/by-nc-nd/2.0/de/
or send a letter to Creative Commons; 559 Nathan Abbott Way;
Stanford, California 94305; USA.

THIS WORK IS PROVIDED FREE OF CHARGE AND WITHOUT ANY WARRANTIES.
Use the information herein at your own risk.

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