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Category:   Application (Security)  >   Clam AntiVirus Vendors:   clamav.sourceforge.net
(Gentoo Issues Fix) Clam AntiVirus Unsafe VirusEvent Directive May Let Local Users Gain Root Privileges
SecurityTracker Alert ID:  1010126
SecurityTracker URL:  http://securitytracker.com/id/1010126
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 11 2004
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Clam AntiVirus in the VirusEvent directive. A local user can execute arbitrary commands on the target system.

l0om reported that if a user has configured a VirusEvent directive in the 'clamav.conf' file, the system may be vulnerable. A local user can create a specially crafted filename containing shell commands and a virus string. When clamd detects the virus, the virusaction() function will reportedly pass the filename to a system() call. As a result, the commands will be executed by clamd, typically with root privileges.

Impact:   A local user can cause operating system commans to be executed by clamd with root privileges.
Solution:   Gentoo has released a fix and recommends that all users of Clam AntiVirus upgrade to the latest stable version:

# emerge sync

# emerge -pv ">=net-mail/clamav-0.70"
# emerge ">=net-mail/clamav-0.70"

Vendor URL:  www.clamav.net/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 1 2004 Clam AntiVirus Unsafe VirusEvent Directive May Let Local Users Gain Root Privileges



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200405-03 ] ClamAV VirusEvent parameter vulnerability


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Gentoo Linux Security Advisory                           GLSA 200405-03
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                                            http://security.gentoo.org/
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  Severity: High
     Title: ClamAV VirusEvent parameter vulnerability
      Date: May 11, 2004
      Bugs: #46264
        ID: 200405-03

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Synopsis
========

With a specific configuration (using %f in the VirusEvent parameter),
Clam AntiVirus is vulnerable to an attack allowing execution of
arbitrary commands.

Background
==========

- From http://www.clamav.net/ :

"Clam AntiVirus is a GPL anti-virus toolkit for UNIX. The main purpose
of this software is the integration with mail servers (attachment
scanning). The package provides a flexible and scalable multi-threaded
daemon, a command line scanner, and a tool for automatic updating via
Internet. The programs are based on a shared library distributed with
the Clam AntiVirus package, which you can use with your own software.
Most importantly, the virus database is kept up to date."

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  net-mail/clamav        < 0.70                             >= 0.70

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

The VirusEvent parameter in the clamav.conf configuration file allows
to specify a system command to run whenever a virus is found. This
system command can make use of the "%f" parameter which is replaced by
the name of the file infected. The name of the file scanned is under
control of the attacker and is not sufficiently checked. Version 0.70
of clamav disables the use of the "%f" parameter.

Impact
======

Sending a virus with a malicious file name can result in execution of
arbirary system commands with the rights of the antivirus process.
Since clamav is often associated to mail servers for email scanning,
this attack can be used remotely.

Workaround
==========

You should not use the "%f" parameter in your VirusEvent configuration.

Resolution
==========

All users of Clam AntiVirus should upgrade to the latest stable
version:

    # emerge sync

    # emerge -pv ">=net-mail/clamav-0.70"
    # emerge ">=net-mail/clamav-0.70"

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

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

     http://security.gentoo.org/glsa/glsa-200405-03.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 2004 Gentoo Technologies, 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/1.0

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