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TUCoPS :: Security App Flaws :: tb11310.htm

ClamAV: Multiple Denials of Service



ClamAV: Multiple Denials of Service
ClamAV: Multiple Denials of Service




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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      < 0.90.3                      >= 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 ">=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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