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                   AMaViS Security Announcement

Date:                   2004-05-02
affected version(s):    amavis-0.1.x, amavis-0.2.x, amavis 0.3.x,
			amavisd, amavisd-new, amavis-ng
Vulnerability Type:     LHa buffer overflows and directory traversal 
			problems 
Priority:               urgent
Solution:               update LHa or apply patch for LHa 
References:             CAN-2004-0234 (buffer overflows)
                        CAN-2004-0235 (directory traversal)
Author:                 Rainer Link <rainer@openantivirus.org>
Advisory ID:            ASA-2004-3
Contact:                security@amavis.org
WWW:			http://www.amavis.org/security/

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1. Problem description
Ulf Harnhammar found two stack-based buffer overflows and two directory
traversal problems in LHa 1.14d to 1.14i and 1.17 (possibly others).

All AMaViS versions use the LHa program to extract LHarc/LZH archives.

2. Impact
Arbitrary code execution, overwriting important system files. The impact
depends on the used AMaViS version (see below).

3. Solution

* amavis 0.1.x / 0.2.x
We strongly recommend to upgrade to amavis 0.3.x, amavisd, amavisd-new
or amavis-ng. The development of amavis 0.1.x / 0.2.x has been
discontinued since July, 2001. Moreover, the security maintenance
will end on August, 1st 2004. 

amavis 0.1.x / 0.2.x is affected by all issues found by Ulf
Harnhammar. Moreover, in some configurations these amavis
versions run as root, which makes it possible to overwrite
any (system) file or allows a possible remote system compromise!

Please fetch the update of LHa from your vendor (if available) or apply
the patch provided by Ulf Harnhammar as soon as possible 
Get the patch from:
http://marc.theaimsgroup.com/?l=full-disclosure&m=108345064008698&w=2


* amavis 0.3.x, amavisd, amavisd-new, amavis-ng
Those versions take some precautings when calling external programs
and extracting files. The original (full path) name(s) will not
be used. Moreover, those versions don't run as root when set up
properly (they do not run as root per default but as a special,
non-privileged user; amavisd-new can be run chroot'ed as well). 
Therefore, the two directory traversal problems should not be 
an issue.

Nevertheless, please fetch the update of LHa from your vendor (if
available) or apply the patch provided by Ulf Harnhammar as soon 
as possible.
Get the patch from:
http://marc.theaimsgroup.com/?l=full-disclosure&m=108345064008698&w=2


4. Acknowledgment
We would like to thank Ulf Harnhammar for disclosing those
vulnerabilities to the public.

5. References
http://marc.theaimsgroup.com/?l=full-disclosure&m=108345064008698&w=2
https://rhn.redhat.com/errata/RHSA-2004-179.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0234
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0235


6. Revision History
2004-05-02: Initial release

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