-----BEGIN PGP SIGNED MESSAGE----- ****************************** FOR PUBLIC RELEASE **************************** __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SunOS rpcbind Vulnerability June 6, 1997 23:00 GMT Number H-70 ________________________________________________________________________ PROBLEM: A vulnerability has been identified in the rpcbind function in the libc library. PLATFORM: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, 5.4, 5.4_x86, and 5.3. DAMAGE: This vulnerability may allow an attacker to gain unauthorized access if exploited. SOLUTION: Apply vendor patches specified below. ________________________________________________________________________ VULNERABILITY It is highly recommended that patches be installed ASSESSMENT: immediately. ________________________________________________________________________ [****** Start Sun Microsystems, Inc Advisory ******] - ------------------------------------------------------------------------------ Sun Microsystems, Inc. Security Bulletin Bulletin Number: #00142 Date: June 4 1997 Cross-Ref: Title: Vulnerability in rpcbind - ------------------------------------------------------------------------------ Permission is granted for the redistribution of this Bulletin, so long as the Bulletin is not edited and is attributed to Sun Microsystems. Portions may also be excerpted for re-use in other security advisories so long as proper attribution is included. Any other use of this information without the express written consent of Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all liability for any misuse of this information by any third party. - ------------------------------------------------------------------------------ 1. Bulletins Topics Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, and 2.3 (SunOS 5.5.1, 5.5, 5.4, and 5.3), that relate to a vulnerability in the rpcbind program, which can aid an attacker to gain unauthorized access if exploited. Sun strongly recommends that you install the patches listed in section 4 immediately on every affected system. 2. Who is Affected Vulnerable: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, 5.4, 5.4_x86, and 5.3. Not vulnerable: All other supported versions of SunOS This vulnerability is fixed in the upcoming release of Solaris. 3. Understanding the Vulnerability The rpcbind program is a server that converts RPC program numbers into universal addresses. When an RPC service is started, it tells rpcbind the address at which it is listening, and the RPC program numbers it is prepared to serve. When a client wishes to make an RPC call to a given program number, it first contacts rpcbind on the server machine to determine the address where RPC requests should be sent. Under Solaris 2.x, rpcbind listens not only on TCP port 111 and UDP port 111, but also on a UDP port number greater than 32770. The exact number depends on the OS release and architecture. This results in a large number of packet filters which intend to block access to rpcbind/portmapper being ineffective. Instead of sending requests to TCP or UDP port 111, the attacker simply sends them to the other UDP port. This vulnerability allows an attacker to obtain remote RPC program information even if TCP or UDP port 111 is being filtered. It can also aid an attacker to gain unauthorized access to hosts running vulnerable versions of the software. 4. List of Patches The vulnerability relating to rpcbind is fixed by the following patches: OS version Patch ID ---------- -------- SunOS 5.5.1 104331-02 SunOS 5.5.1_x86 104332-02 SunOS 5.5 104357-02 SunOS 5.5_x86 104358-02 SunOS 5.4 102070-03 SunOS 5.4_x86 102071-03 SunOS 5.3 102034-02 5. Checksum Table The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum), SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures for the above-mentioned patches that are available from: ftp://sunsolve1.sun.com/pub/patches/patches.html These checksums may not apply if you obtain patches from your answer centers. File Name BSD SVR4 MD5 - --------------- --------- --------- -------------------------------- 104331-02.tar.Z 64512 111 17253 222 29C2D5649C56A3D64E1F1DFCE3783842 104332-02.tar.Z 56808 111 23404 221 4B5D28F4A686166C4C147BE4E9563B8C 104357-02.tar.Z 27488 111 31772 222 316B03F737FC61DC09877C2BB822E7EE 104358-02.tar.Z 22598 110 46888 220 1665E8724D0A3DB401A00BE812630A37 102070-03.tar.Z 32763 100 14089 200 31FB11BC9D89A6D540F87624D4A2CFAE 102071-03.tar.Z 21217 100 18859 199 76DDAF2CAE25535A9AE932F3B0C98E3A 102034-02.tar.Z 23648 100 49973 199 243CD25673D87D0277F5CFE06E327347 - ------------------------------------------------------------------------------ Sun acknowledges with thanks Secure Networks, Inc. for their assistance in the preparation of this bulletin. - ------------------------------------------------------------------------------ APPENDICES A. Patches listed in this bulletin are available to all Sun customers via World Wide Web at: ftp://sunsolve1.sun.com/pub/patches/patches.html Customers with Sun support contracts can also obtain patches from local Sun answer centers and SunSITEs worldwide. B. To report or inquire about a security problem with Sun software, contact one or more of the following: - Your local Sun answer centers - Your representative computer security response team, such as CERT - Sun Security Coordination Team. Send email to: security-alert@sun.com C. 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To subscribe, supply the following in the subject line (not body): SUBSCRIBE cws your-email-address Note that your-email-address should be substituted by your email address. UNSUBSCRIBE Sender is removed from our mailing list. [****** End Sun Microsystems, Inc Advisory ********] ________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems, Secure Networks, Inc. for the information contained in this bulletin. ________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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World Wide Web: http://ciac.llnl.gov/ Anonymous FTP: ciac.llnl.gov (198.128.39.53) Modem access: +1 (510) 423-4753 (28.8K baud) +1 (510) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. CIAC-NOTES for Notes, a collection of computer security articles; 3. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 4. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. 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If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. 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