Vulnerability Note VU#145825

SISCO OSI stack fails to properly handle malformed packets

Overview

A vulnerability exists in the SISCO OSI stack. If this vulnerability is successfully exploited, an attacker could cause a denial-of-service condition.

I. Description

The SISCO OSI stack is a component of the SISCO MMS-EASE, ICCP Toolkit for MMS-EASE, AX-S4 MMS and AX-S4 ICCP products. The SISCO OSI stack fails to properly handle malformed packets. A remote attacker may be able to trigger this vulnerability by sending a specially crafted series of packets to a vulnerable SISCO OSI stack installation.

Note that a valid connection is needed to trigger this vulnerability.

The SISCO OSI stack is used in a wide variety of control system applications. Users should check their applications to ensure they are using a non-vulnerable version of the SISCO OSI stack. Users are encouraged to contact their software vendors if they suspect they are vulnerable.

II. Impact

A remote attacker can cause the OSI stack to terminate abnormally resulting in a denial-of-service condition requiring an application using the SISCO OSI stack and the SISCO OSI stack itself to be restarted.

III. Solution

Upgrade or Patch accordingly

SISCO has corrected this problem in the latest version of the SISCO OSI stack. SISCO has also released patches to address this issue in older versions of the SISCO OSI stack for Windows.

Restrict Access

Restrict remote access to only trusted hosts by using firewalls or only connecting them to private networks.

Systems Affected

Vendor	Status	Date Notified	Date Updated
SISCO - Systems Integration Specialists Company, Inc.	Vulnerable	12-Jan-2007

References

http://www.sisconet.com/home.htm
http://www.sisconet.com/contact.htm
http://secunia.com/advisories/23819/
http://www.securityfocus.com/bid/22095

Credit

Thanks to Matthew D. Franz for researching and reporting this vulnerability.

This document was written by Jeff Gennari.

Other Information

Date Public:	2007-01-17
Date First Published:	2007-01-17
Date Last Updated:	2007-01-26
CERT Advisory:
CVE-ID(s):	CVE-2006-6489
NVD-ID(s):	CVE-2006-6489
US-CERT Technical Alerts:
Metric:	0.50
Document Revision:	39

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Produced 2007 by US-CERT, a government organization
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