-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
ESB-2008.0155 -- [Win][UNIX/Linux]
ClamAV libclamav PE File Integer Overflow Vulnerability
13 February 2008
AusCERT Security Bulletin Summary
Product: ClamAV 0.92 and prior
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact: Execute Arbitrary Code/Commands
CVE Names: CVE-2008-0318 CVE-2008-0728
Revision History: February 13 2008: Added CVE
February 13 2008: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
iDefense Security Advisory 02.12.08
Feb 12, 2008
Clam AntiVirus is a multi-platform GPL anti-virus toolkit. ClamAV is
often integrated into e-mail gateways and used to scan e-mail traffic
for viruses. It supports virus scanning for a wide variety of packed
Portable Executable (PE) binaries. For more information visit the
vendor's web site at the following URL.
Remote exploitation of an integer overflow vulnerability in Clam
AntiVirus' ClamAV, as included in various vendors' operating system
distributions, allows attackers to execute arbitrary code with the
privileges of the affected process.
The vulnerability exists within the code responsible for parsing and
scanning PE files. While iterating through all sections contained in
the PE file, several attacker controlled values are extracted from the
file. On each iteration, arithmetic operations are performed without
taking into consideration 32-bit integer wrap.
Since insufficient integer overflow checks are present, an attacker can
cause a heap overflow by causing a specially crafted Petite packed PE
binary to be scanned. This results in an exploitable memory corruption
Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the process using libclamav. In the case of
the clamd program, this will result in code execution with the
privileges of the clamav user. Unsuccessful exploitation results in the
clamd process crashing.
Address Space Layout Randomization (ASLR) and non-executable memory
protection technologies (such as DEP, NX, XD, PaX, etc) can help
mitigate exploitation of this type of vulnerability.
iDefense has confirmed the existence of this vulnerability in ClamAV
0.92. Previous versions may also be affected.
Disabling the scanning of PE files will prevent exploitation.
If using clamscan, this can be done by running clamscan with the
If using clamdscan, set the 'ScanPE' option in the clamd.conf file to
VI. VENDOR RESPONSE
The ClamAV team has addressed this vulnerability within version 0.92.1.
Additionally, the ClamAV team reports, "the vulnerable module was
remotely disabled via virus-db update on Jan 11th 2008."
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2008-0318 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
01/07/2008 Initial vendor notification
01/11/2008 Initial vendor response
02/12/2008 Coordinated public disclosure
This vulnerability was reported to iDefense by Silvio Cesare.
Get paid for vulnerability research
Free tools, research and upcoming events
X. LEGAL NOTICES
Copyright Â© 2008 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail firstname.lastname@example.org for permission.
Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to email@example.com
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----