GLSA 200706-05 ClamAV: Multiple Denials of Service
Posted on: 06/15/2007 06:05 PM

A new security update has been released for Gentoo Linux - ClamAV: Multiple Denials of Service. Here the announcement:

Gentoo Linux Security Advisory GLSA 200706-05
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http://security.gentoo.org/
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Severity: Normal
Title: ClamAV: Multiple Denials of Service
Date: June 15, 2007
Bugs: #178082
ID: 200706-05

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Synopsis
========

ClamAV contains several vulnerabilities leading to a Denial of Service.

Background
==========

ClamAV is a GPL virus scanner.

Affected packages
=================

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-antivirus/clamav lt; 0.90.3 gt;= 0.90.3

Description
===========

Several vulnerabilities were discovered in ClamAV by various
researchers:

* Victor Stinner (INL) discovered that the OLE2 parser may enter in
an infinite loop (CVE-2007-2650).

* A boundary error was also reported by an anonymous researcher in
the file unsp.c, which might lead to a buffer overflow
(CVE-2007-3023).

* The file unrar.c contains a heap-based buffer overflow via a
modified vm_codesize value from a RAR file (CVE-2007-3123).

* The RAR parsing engine can be bypassed via a RAR file with a header
flag value of 10 (CVE-2007-3122).

* The cli_gentempstream() function from clamdscan creates temporary
files with insecure permissions (CVE-2007-3024).

Impact
======

A remote attacker could send a specially crafted file to the scanner,
possibly triggering one of the vulnerabilities. The two buffer
overflows are reported to only cause Denial of Service. This would lead
to a Denial of Service by CPU consumption or a crash of the scanner.
The insecure temporary file creation vulnerability could be used by a
local user to access sensitive data.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ClamAV users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose "gt;=app-antivirus/clamav-0.90.3"

References
==========

[ 1 ] CVE-2007-2650
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2650
[ 2 ] CVE-2007-3023
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3023
[ 3 ] CVE-2007-3024
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3024
[ 4 ] CVE-2007-3122
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3122
[ 5 ] CVE-2007-3123
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3123

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200706-05.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5



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