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Date: Mon, 13 Aug 2012 17:55:12 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Matthias Andree <matthias.andree@....de>
Subject: Re: CVE ID request for fetchmail segfault in NTLM
 protocol exchange

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On 08/13/2012 01:27 PM, Matthias Andree wrote:
> Please assign a CVE ID for the problem described below.  Note that
> the text below is a *draft* security advisory that will change
> before being officially released.
> 
> 
> fetchmail-SA-2012-02: DoS possible with NTLM authentication in
> debug mode
> 
> Topics:		fetchmail denial of service in NTLM protocol phase
> 
> Author:		Matthias Andree Version:	draft Announced:	2012-08-13 Type:
> crash while reading from bad memory location Impact:		fetchmail
> segfaults and aborts, stalling inbound mail Danger:		low 
> Acknowledgment:	J. Porter Clark
> 
> CVE Name:	(TBD) URL:
> http://www.fetchmail.info/fetchmail-SA-2012-02.txt Project URL:
> http://www.fetchmail.info/
> 
> Affects:	- fetchmail releases 5.0.8 up to and including 6.3.21 when
> compiled with NTLM support enabled
> 
> Not affected:	- fetchmail releases compiled with NTLM support
> disabled - fetchmail releases 6.3.22 and newer
> 
> Corrected in:	2012-08-13 Git, among others, see commit 
> 3fbc7cd331602c76f882d1b507cd05c1d824ba8b
> 
> 2012-08-xx fetchmail 6.3.22 release tarball
> 
> 
> 0. Release history ==================
> 
> 2012-08-13 0.1	draft
> 
> 
> 1. Background =============
> 
> fetchmail is a software package to retrieve mail from remote POP3,
> IMAP, ETRN or ODMR servers and forward it to local SMTP, LMTP
> servers or message delivery agents. fetchmail supports SSL and TLS
> security layers through the OpenSSL library, if enabled at compile
> time and if also enabled at run time, in both SSL/TLS-wrapped mode
> on dedicated ports as well as in-band-negotiated "STARTTLS" and
> "STLS" modes through the regular protocol ports.
> 
> 
> 2. Problem description and Impact 
> =================================
> 
> Fetchmail version 5.0.8 added NTLM support. This code sent the
> NTLM authentication request, but never checked if the received
> response was NTLM protocol exchange, or a server-side error
> message.  Instead, fetchmail tried to decode the error message as
> though it were base64-encoded protocol exchange, and could then
> segfault depending of buffer contents, while reading data from bad
> memory locations.
> 
> 
> 3. Solution ===========
> 
> Install fetchmail 6.3.22 or newer.
> 
> The fetchmail source code is always available from 
> <http://developer.berlios.de/project/showfiles.php?group_id=1824>.
> 
> Distributors are encouraged to review the NEWS file and move
> forward to 6.3.22, rather than backport individual security fixes,
> because doing so routinely misses other fixes crucial to
> fetchmail's proper operation, for which no security announcements
> are issued, or documentation.
> 
> Fetchmail 6.3.X releases have always been made with a focus on
> unchanged user and program interfaces so as to avoid disruptions
> when upgrading from 6.3.X to 6.3.Y with Y > X.  Care was taken to
> not change the interface incompatibly.
> 
> 
> A. Copyright, License and Non-Warranty 
> ======================================
> 
> (C) Copyright 2012 by Matthias Andree, <matthias.andree@....de>. 
> Some rights reserved.
> 
> This work is licensed under the Creative Commons
> Attribution-NoDerivs 3.0 Germany License (CC BY-ND 3.0).
> 
> To view a copy of this license, visit 
> http://creativecommons.org/licenses/by-nd/3.0/de/deed.en or send a
> letter to:
> 
> Creative Commons 444 Castro Street Suite 900 MOUNTAIN VIEW,
> CALIFORNIA 94041 USA
> 
> 
> THIS WORK IS PROVIDED FREE OF CHARGE AND WITHOUT ANY WARRANTIES. 
> Use the information herein at your own risk.
> 
> END of fetchmail-SA-2012-02

Please use CVE-2012-3482 for this issue.

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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