Trend Micro OfficeScan Session Cookie Buffer Overflow Vulnerability

iDefense Security Advisory 07.16.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 16, 2007

I. BACKGROUND

Trend Micro OfficeScan is a centrally managed AntiVirus solution that
allows administrators to manage virus and spyware protection in
business environments. More information can be found on the vendors
site at the following URL.

http://us.trendmicro.com/us/products/enterprise/officescan-client-server-edition/

II. DESCRIPTION

Remote exploitation of a stack-based buffer overflow vulnerability in
Trend Micro Inc.'s OfficeScan for Windows could allow attackers to
execute arbitrary code with the privileges of the IIS Web User.

The OfficeScan installation includes a series of CGI executables that
are used for configuration through the Web interface. A shared library,
CGIOCommon.dll, is used by many of these binaries to access environment
variables passed to them from the parent IIS process. If a malicious
Web request is made for a vulnerable binary, including an overly long
session cookie, a stack-based Unicode buffer overflow will occur.

III. ANALYSIS

Exploitation allows attackers to execute arbitrary code with the
permissions of the IIS Web user. Exploitation does not require
authentication.

While the IIS Web user account is a limited account, this attack could
be used to conduct further privilege escalation attacks.

IV. DETECTION

iDefense has confirmed this vulnerability in OfficeScan 7.3 with all
current patches applied. Testing has shown that this attack can be
conducted by requesting multiple CGI binaries that make use of the
shared library. Other versions are suspected to be vulnerable.

V. WORKAROUND

iDefense is currently unaware of any workaround for this issue.

VI. VENDOR RESPONSE

Trend Micro has addressed this vulnerability by releasing the following
patches for affected products.

  CSM3.6 security patch 1149
  CSM3.5 security patch 1152
  CSM3.0 security patch 1209

http://www.trendmicro.com/download/product.asp?productid=39

  OSCE 8.0 security patch 1042
  OSCE 7.3 security patch 1293
  OSCE 7.0 security patch 1364
  OSCE 6.5 security patch 1364
  OSCE 6.0 for SMB2.0 security patch 1398

http://www.trendmicro.com/download/product.asp?productid=5

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3454 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

06/07/2007  Initial vendor notification
06/07/2007  Initial vendor response
07/16/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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X. LEGAL NOTICES

Copyright © 2007 iDefense, Inc.

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.

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