Public Vulnerability Reports

Computer Associates eTrust Intrusion Detection Denial of Service Vulnerability



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.


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.


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.


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


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


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


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 (, which standardizes names for security problems.


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


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2007 Verisign, Inc.

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