AUSCERT External Security Bulletin Redistribution

         ESB-2003.0137 -- Internet Security Systems Security Brief
                   Snort RPC Preprocessing Vulnerability
                               04 March 2003


        AusCERT Security Bulletin Summary

Product:                Snort
Operating System:       Linux
Impact:                 Root Compromise
Access Required:        Remote

         CIAC Bulletin: http://www.ciac.org/ciac/bulletins/n-049.shtml
         ISS Bulletin:
         CVE Id: CAN-2003-0033
         Vendor: http://www.snort.org/

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Internet Security Systems Security Brief
March 3, 2003

Snort RPC Preprocessing Vulnerability


ISS X-Force has discovered a remotely exploitable buffer overflow condition
in Snort. Snort is an open source intrusion detection system. A buffer
overflow flaw exists in Snort RPC preprocessing code that is vulnerable to


Remote attackers may exploit the buffer overflow condition to run arbitrary
code on a Snort sensor with the privileges of the Snort IDS process, which
typically runs as the superuser. The vulnerable preprocessor is enabled by
default. It is not necessary to establish an actual connection to a RPC
portmapper service to exploit this vulnerability.

Snort may be installed by default on some commercially available network-
security appliances. Remote attackers can exploit this vulnerability by
directing the exploit towards any host on any network monitored by the Snort
intrusion detection system. A successful attack can either crash the Snort
sensor, or lead to complete remote compromise.

Affected Versions:

Snort 1.8 (July 2001) up to and including Snort-Current (March 3, 2003 1pm ET)

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) 2003 Internet Security Systems, Inc. All rights reserved

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 xforce@iss.net for

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 PGP.com's key server,
as well as at http://www.iss.net/security_center/sensitive.php
Please send suggestions, updates, and comments to: X-Force
xforce@iss.net of Internet Security Systems, Inc.

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