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Category:   Application (Security)  >   Clam AntiVirus Vendors:   clamav.sourceforge.net
(Gentoo Issues Fix) Clam AntiVirus May Crash When Processing Certain RAR Archives
SecurityTracker Alert ID:  1009715
SecurityTracker URL:  http://securitytracker.com/id/1009715
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 9 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.68
Description:   A denial of service vulnerability was reported in Clam AntiVirus. A remote user can send files that will cause Clam AntiVirus to crash.

The vendor reported that there is a flaw in 'unrarlib' that causes the component to crash when processing some RAR archives created by the Bagle worm.

Impact:   A remote user can send specially crafted RAR archives to cause the Clam AntiVirus to crash.
Solution:   Gentoo has released a fix and indicates that ClamAV users should upgrade to version 0.68.1 or later:

# emerge sync

# emerge -pv ">=net-mail/clamav-0.68.1"
# emerge ">=net-mail/clamav-0.68.1"

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

Message History:   This archive entry is a follow-up to the message listed below.
Mar 20 2004 Clam AntiVirus May Crash When Processing Certain RAR Archives



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200404-07 ] ClamAV RAR Archive Remote Denial Of Service Vulnerability



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Gentoo Linux Security Advisory                           GLSA 200404-07
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                                             http://security.gentoo.org
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  Severity: Normal
     Title: ClamAV RAR Archive Remote Denial Of Service Vulnerability

      Date: April 07, 2004=20
      Bugs: #45357
        ID: 200404-07

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Synopsis
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ClamAV is vulnerable to a denial of service attack when processing
certain RAR archives.

Background
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=46rom 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
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     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
     net-mail/clamav        <=3D 0.68                          >=3D 0.68.1

Description
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Certain types of RAR archives, including those created by variants of
the W32.Beagle.A@mm worm, may cause clamav to crash when it attempts to
process them.

Impact
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This vulnerability causes a Denial of Service in the clamav process.
Depending on configuration, this may cause dependent services such as
mail to fail as well.

Workaround
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A workaround is not currently known for this issue. All users are
advised to upgrade to the latest version of the affected package.

Resolution
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ClamAV users should upgrade to version 0.68.1 or later:

    # emerge sync

    # emerge -pv ">=3Dnet-mail/clamav-0.68.1"
    # emerge ">=3Dnet-mail/clamav-0.68.1"

Concerns?
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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.

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