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AL-2002.09 -- Remote Buffer Overflow Vulnerability in Sun RPC

Date: 01 August 2002
References: ESB-2002.379  ESB-2002.391  ESB-2002.394  ESB-2002.397  ESB-2002.404  ESB-2002.406  ESB-2002.444  ESB-2002.445  ESB-2002.665  ESB-2003.0130  

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A  U  S  C  E  R  T                                           A  L  E  R  T

                        AL-2002.09 -- AUSCERT ALERT
              Remote Buffer Overflow Vulnerability in Sun RPC
                            ISS Security Brief
                               1 August 2002


        AusCERT Alert Summary

Product:                Sun RPC
                        Sun XDR
Vendor:                 Internet Security Systems
Operating System:       Solaris 2.5.1
                        Solaris 2.6
                        Solaris 7
                        Solaris 8
                        Solaris 9
Impact:                 Root Compromise
Access Required:        Remote

AusCERT is issuing this external security bulletin as an AUSCERT ALERT to
emphasize the significance of this vulnerability. The message included
below is a security bulletin published by Internet Security Systems (ISS)
X-Force regarding a an interger overflow in the Sun XDR libraries.

AusCERT advises site administrators to confirm, from information contained
in this advisory, their exposure to this vulnerability and to apply vendor
patches as they become available.

- --------------------------BEGIN INCLUDED TEXT--------------------


Internet Security Systems Security Brief
July 31, 2002

Remote Buffer Overflow Vulnerability in Sun RPC


Internet Security Systems (ISS) X-Force has discovered a buffer overflow
in the xdr_array filter primitive. This function is a part of the Sun RPC
library, and it is used in multiple RPC services. Any native or third party
software that uses the xdr_array function may be vulnerable. Vulnerable RPC
services are installed and enabled by default on the affected software


The buffer overflow vulnerability can allow remote attackers to execute
arbitrary commands on a target system with superuser privileges. Attackers
pose the most serious risk when attacking unprotected networks, or improperly
protected networks

Affected Versions:

Sun Microsystems Solaris 2.5.1
Sun Microsystems Solaris 2.6
Sun Microsystems Solaris 7
Sun Microsystems Solaris 8
Sun Microsystems Solaris 9

Note: The versions above were tested and found to be vulnerable.  Additional
commercial and open-source Unix operating systems use implementations of Sun
RPC, and may also be vulnerable.

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

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

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.

Version: 2.6.2


- --------------------------END INCLUDED TEXT--------------------

This alert is provided as a service to AusCERT\'s members.  As AusCERT did
not write the document quoted above, AusCERT has had no control over its   
content.  The decision to use any or all of this information is the
responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the alert.  It may not be
updated when updates to the original are made.  If downloading at a later
date, it is recommended that the alert is retrieved directly from the
original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the alert above.  If you have any questions or need further information,
please contact them directly.

Previous advisories, alerts and external security bulletins can be 
retrieved from:

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email:
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.

Version: 2.6.3i
Charset: noconv