[Full-Disclosure] [ GLSA 200405-03 ] ClamAV VirusEvent parameter vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 05/11/04

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    To: gentoo-announce@gentoo.org
Date: Tue, 11 May 2004 21:31:51 +0200

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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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