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AMaViS Security Announcement
Date: 07/27/2000
affected version(s): all AMaViS releases using metamail, in detail
all release versions up to 0.2.0-pre6
all release versions 0.2.0-pre6-clm up
to 0.2.0-pre6-clm-rl-8
all CVS version before
0.2.0-pre6-clm-rl-8-04-07-2000
(AMaViS-Perl is NOT affected)
Vulnerability Type: some eMail worms (i.e. KAKworm) may not be
detected
Priority: urgent
Solution: update to latest CVS version, install reformime
Author: Rainer Link <link@...>
Advisory ID: ASA-2000-1
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1. Problem description
AMaViS uses metamail do split a eMail message in its parts, i.e. the mail
body and the attachment file(s).
The file(s) are written to the directory /var/tmp/scanmails<pid>/unpacked
by default.
As metamail is very old and as it seems not maintained anymore, it is not
able to handle MIME multipart/alternative messages. Such a message
contains a plain ASCII text body part and a HTML body part, which is
created e.g. by Netscape Messanger if "Message Formatting" is set to
"Send the message in plain text and HTML".
Therefore /var/tmp/scanmails<pid>/unpacked is empty and no known
virus/worm will be detected.
2. Impact
It is possible that a known virus/worm is not detected and an infected
eMail is delivered to the user. We got reports that this has happend
with the KAKworm.
3. Solution
Since AMaViS 0.2.0-pre6-clm-rl-8-04-07-2000 it is possible to use
reformime as a replacement for metamail. reformime comes within the
maildrop package. ./configure looks first for reformime, therefore if
it's installed, AMaViS will use it.
Or if pssible use AMaViS-Perl instead, which uses a Perl module for
MIME handling.
4. Acknowledgment
I would like to thank Craig Baird who first reported this problem to me
and helped to track it down.
5. References
metamail can be found at ftp://thumper.bellcore.com/pub/nsb/
reformime, part of the maildrop package, can be found at
http://www.flounder.net/~mrsam/maildrop/
To checkout the latest CVS version of AMaViS please visit
http://sourceforge.net/projects/amavis
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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