BlackICE Agent TCP connections could cause excessive memory consumption on some systems

blackice-excessive-memory-consumption (9405) The risk level is classified as LowLow Risk


BlackICE Agent versions 3.1.eal and 3.1.ebh running on Microsoft Windows 2000 laptops are vulnerable to a denial of service attack. A remote attacker from within the same network segment as the vulnerable host could establish a large number of TCP connections to the host to cause the BlackICE Agent to consume up to 400 mb of memory. This could cause a denial of service on systems with low memory resources. Once this attack is performed, normal functionality would return in 10 to 15 minutes.


Denial of Service


BlackICE Agent users should reconfigure the maximum number of TCP connections to 5000 simultaneous connections. This setting can be adjusted by editing the local "blackice.ini" file, or by modifying this parameter using the ICEcap Management console: tcp.maxconnections=5000

Note: The next version of BlackICE Agent will be updated with the correct tuning parameters.


Platforms Affected:

  • ISS BlackICE Agent for Workstation 3.1 ebh
  • ISS BlackICE Agent for Workstation 3.1 eal


Jun 19, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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