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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@suse.de>
Advisory ID:            ASA-2000-1

- ---------------------------------------------------------------------------

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@suse.de, Web: www.suse.de
Developer of  A Mail Virus Scanner (AMaViS): http://amavis.org/
Founder of Linux AntiVirus Project: http://lavp.sourceforge.net/