Fetchmail MDA Option Message Refusal Bugs Let Remote Users Deny Service
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SecurityTracker Alert ID: 1017479 |
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SecurityTracker URL: http://securitytracker.com/id/1017479
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CVE Reference:
CVE-2006-5974
(Links to External Site)
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Date: Jan 8 2007
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 6.3.5, 6.3.6-rc1, 6.3.6-rc2
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Description:
A vulnerability was reported in Fetchmail. A remote user can cause denial of service conditions.
A remote user can send a specially crafted message that, when delivered to a message delivery agent via the "mda" option, may cause the fetchmail process to crash when refusing the message.
SMTP and LMTP delivery modes are not affected.
Neil Hoggarth reported this vulnerability.
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Impact:
A remote user can cause the target service to crash.
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Solution:
The vendor has issued a fixed version (6.3.6).
The fetchmail advisory is available at:
http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
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Vendor URL: fetchmail.berlios.de/fetchmail-SA-2006-03.txt (Links to External Site)
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Cause:
State error
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Message History:
None.
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Source Message Contents
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Subject: fetchmail security announcement 2006-03 (CVE-2006-5974)
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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>.
A. Copyright, License and Warranty
==================================
(C) Copyright 2007 by Matthias Andree, <matthias.andree@gmx.de>.
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.
END OF fetchmail-SA-2006-03.txt
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