Public Vulnerability Reports

Computer Associates eTrust Intrusion Detection Denial of Service Vulnerability

02.27.07

BACKGROUND

Computer Associates eTrust Intrusion Detection is a network intrusion management and prevention system, that includes real-time session monitoring and Internet web filtering capabilities. More information can be found on the vendors site at the following URL.

http://www3.ca.com/solutions/Product.aspx?ID=163

DESCRIPTION

The eTrust Intrusion Detection process listens on TCP port 9191 for remote administration functions. Administrator login requires that keys be exchanged including a session key with blowfish encryption of the login and the password.

Since the administration server fails to properly validate the key length value, it is possible to cause the product to crash. During decryption, 4 is subtracted from the specified length and the result used as the length of the data to decrypt. The decryption loop will proceed to overwrite the entire heap segment. This leads to an unhandled exception.

ANALYSIS

Exploitation of this vulnerability allows attackers to cause the administration service to crash.

Since the heap is not used once corrupted, the heap overflow cannot be exploited for more than a denial of service.

DETECTION

iDefense has confirmed this vulnerability in Computer Associates eTrust Intrusion Detection version 3.0.5.57. Other versions are suspected vulnerable.

WORKAROUND

Employ firewalls to limit access to the affected system to reduce exposure to this vulnerability.

VENDOR RESPONSE

Computer Associates has issued patches to correct this vulnerability. More information is available in their advisory which can be found at the following URL.

http://supportconnectw.ca.com/public/ca_common_docs/eid_secnotice.asp

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-1005 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

01/16/2007 Initial vendor notification
01/16/2007 Initial vendor response
02/27/2007 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.

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.