ISS Security Brief: Flaw in Internet Scanner Parsing Mechanism

Type securityvulns
Reporter Securityvulns
Modified 2002-09-19T00:00:00


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Internet Security Systems Security Brief September 18, 2002

Flaw in Internet Scanner Parsing Mechanism


ISS X-Force has learned of a text parsing flaw within Internet Scanner. Internet Scanner incorrectly parses improperly formatted Web response messages. This flaw may lead to a buffer overflow within Internet Scanner.


The Internet Scanner response parsing flaw may lead to a denial of service (DoS) attack or remote command execution on the vulnerable Internet Scanner server. This attack can only be launched if an attacker configures a non-standard condition on a computer within the licensed address range. The attack cannot be launched unless the attacker runs Internet Scanner or waits for Internet Scanner to be launched by an authorized third-party.

Affected Versions:

Internet Scanner 6.2.1 for Windows NT and Windows 2000

For the complete ISS X-Force Security Advisory, please visit:

About Internet Security Systems (ISS) Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a pioneer and world leader in software and services that protect critical online resources from an ever-changing spectrum of threats and misuse. Internet Security Systems is headquartered in Atlanta, GA, with additional operations throughout the Americas, Asia, Australia, Europe and the Middle East.

Copyright (c) 2002 Internet Security Systems, Inc. All rights reserved worldwide.

Permission is hereby granted for the electronic redistribution of this document. It is not to be edited or altered in any way without the express written consent of the Internet Security Systems X-Force. If you wish to reprint the whole or any part of this document in any other medium excluding electronic media, please email for permission.

Disclaimer: The information within this paper 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 (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.

X-Force PGP Key available on MIT's PGP key server and's key server, as well as at

Please send suggestions, updates, and comments to: X-Force of Internet Security Systems, Inc.

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