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                                @stake, Inc.
                              www.atstake.com

                             Security Advisory

Advisory Name: Netegrity SiteMinder Affiliate Agent Cookie
               Overflow
 Release Date: 04/22/2004
  Application: SiteMinder Affiliate Agent 4.x
     Platform: Solaris, Windows, HP-UX
     Severity: A remote attacker can execute arbitrary commands
       Author: Jeremy Jethro <jjethro@si.rr.com>
Vendor Status: Vendor has patch available
CVE Candidate: CAN-2004-0425 SiteMinder Affiliate Agent Cookie
               Overflow
    Reference: www.atstake.com/research/advisories/2004/a042204-1.txt


Overview:

The SiteMinder Affiliate Agent is a plugin that provides a connection
from a main portal to an affiliate site without requiring a user to
re-identify or provide additional information about them.  The
affiliate site can determine that the user has been registered at the
main portal, and optionally, that the user has an active SiteMinder
session.


Details:

The SMPROFILE cookie is used by the affiliate agent to determine if
the user has been registered to the main portal.  A remotely
exploitable heap overflow can be triggered by passing a large value
to the SMPROFILE cookie.

A Nessus (NASL) script, siteminder_aa.nasl, which can be used to
scan for vulnerable servers, will be released after a 30 day delay.

Web servers that use the vulnerable SiteMinder plugin will quit
responding to requests when the NASL script is executed.


Vendor Response:

The handling of HTTP cookies has been modified to correctly process
cookies of all sizes.

Please download and install the following package to apply the fix:

     Web Agent 4QMR6 HF-016

The package is available at https://support.netegrity.com

Please contact Netegrity Support for more information.

Toll-free Phone Number (U.S and Canada only):
(877) 748-3646 (or 877-SITEMINDER)
International Phone Number:
+1 (781) 663-7250 or +60 3 2055 3333


Notification Timeline:

4/07/2004 Vendor notified of issue
4/08/2004 Vendor confirms notification
4/14/2004 Vendor responds that they are fixing issue
4/21/2004 Vendor informs us that they have a patch available
4/22/2004 Advisory released


Recommendation:

Install the vendor supplied update.

Install an application level firewall that has cookie size
filtering and restrict cookie sizes to less that 1024 bytes. This
may effect other applications.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues.  These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.

  CAN-2004-0425 SiteMinder Affiliate Agent Cookie Overflow


Open Source Vulnerability Database Project (OSVDB) Information:

  OSVDB ID 5578


@stake Vulnerability Reporting Policy:
http://www.atstake.com/research/policy/

@stake Advisory Archive:
http://www.atstake.com/research/advisories/

PGP Key:
http://www.atstake.com/research/pgp_key.asc

Copyright 2004 @stake, Inc. All rights reserved.

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