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===========================================================================
AMaViS Security Announcement
Date: 07/27/2000
affected version(s): AMaViS 0.2.0-pre6-clm-rl-8-04-07-2000 and later
if reformime below 1.01 is used
(AMaViS-Perl is NOT affected)
Vulnerability Type: attacker could pass virus through AMaViS /
Denial-of-Service attack against AMaViS
Priority: urgent
Solution: apply patch / update reformime
Author: Rainer Link <link@...>
Advisory ID: ASA-2000-2
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1. Problem description
AMaViS uses reformime, part of the maildrop package, to split
eMail messages in its parts.
reformime version below 1.0 (tested with 0.76b) overwrite files
with the same file names.
reformime version 1.0 tries to avoid overwritting files but a bug
causes an endless loop.
2. Impact
reformime below 1.0: an attacker can create an eMail message with two
attachments with the same file name. The first file contains a virus,
the second one is clean. reformime overwrites the first one with the
second. Therefore no virus is detected and the mail will be delivered
to user(s).
reformime 1.0 tries to avoid clobbering of existing files but due
to a bug it will end up in an endless loop. This could be used as
a denial-of-service attack against AMaViS.
3. Solution
Apply the provided patch for reformime 1.0. Or update to maildrop 1.01,
which will be released soon according to the author.
Or if possible use AMaViS-Perl instead, which uses a Perl module for
MIME handling.
4. Acknowledgment
This bug was discovered by Rainer Link. We would like to thank Sam
Varshavchik, the author of maildrop, for providing a patch quickly.
5. References
reformime, part of the maildrop package, can be found at
http://www.flounder.net/~mrsam/maildrop/
6. Revision History
07/27/2000: initial release
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--
Rainer Link, SuSE GmbH, eMail: link@..., Web: http://www.suse.de Developer
of A Mail Virus Scanner (AMaViS): http://amavis.org/ Founder of Linux
AntiVirus Project: http://lavp.sourceforge.net/
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