Trend Micro OfficeScan Management Console Authorization Bypass 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 an authorization bypass vulnerability in Trend
Micro Inc.'s OfficeScan for Windows could allow attackers to login to
the management console and alter application settings.

The OfficeScan installation includes a web management console that
allows administrators to configure the application and the Antivirus
clients it manages. The web interface login is handled by
cgiChkMasterPwd.exe which is passed a hash and an encrypted version of
the password generated by an ActiveX control on the login page.

If cgiChkMasterPwd.exe is sent an empty encryption string and empty hash
it proceeds to issue the client a valid session id which can then be
used to access the web management console.

III. ANALYSIS

Exploitation allows attackers to manage the OfficeScan application
settings and the setting of the antivirus clients which it controls.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in OfficeScan
for Windows 7.3 with all current patches applied. Previous versions may
also be affected.

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-2007-3455 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

06/14/2007  Initial vendor notification
06/20/2007  Initial vendor response
07/16/2007  Coordinated public disclosure

IX. CREDIT

This vulnerability was reported to iDefense by David Maciejak.

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X. LEGAL NOTICES

Copyright © 2007 iDefense, Inc.

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at the time of publishing based on currently available information. Use
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