-----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN HP SharedX Denial-of-Service Vulnerability October 29, 1998 16:00 GMT Number J-015 ______________________________________________________________________________ PROBLEM: A vulnerability exist in the SharedX Receiver Service (recserv). PLATFORM: HP 9000 series 700/800. DAMAGE: Certain messages to the port can cause recserv to enter a tight processing loop. This processing could cause excessive cpu usage resulting in a denial of service. SOLUTION: Install the patches listed below. ______________________________________________________________________________ VULNERABILITY Risk is medium. Hewlett-Packard does recommend that the patches ASSESSMENT: be installed as soon as possible. ______________________________________________________________________________ [ Start Hewlett-Packard Advisory ] Document ID: HPSBUX9810-086 Date Loaded: 19981027 Title: Security Vulnerability with SharedX - ------------------------------------------------------------------------- HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #00086, 28 October 1998 - ------------------------------------------------------------------------- The information in the following Security Bulletin should be acted upon as soon as possible. Hewlett-Packard Company will not be liable for any consequences to any customer resulting from customer's failure to fully implement instructions in this Security Bulletin as soon as possible. - ------------------------------------------------------------------------- PROBLEM: The SharedX program recserv is vulnerable to a denial of service attack. PLATFORM: HP 9000 series 700/800. DAMAGE: Excessive cpu usage. SOLUTION: Install the patches listed below. AVAILABILITY: All patches are available now. - ------------------------------------------------------------------------- I. A. Background HP SharedX Receiver Service (recserv) provides a method for a receiver to allow the sharing of windows without explicitly performing any xhost commands. The Internet daemon, inetd, executes recserv when it receives a service request at the port listed in the services database. Certain messages to the port can cause recserv to enter a tight processing loop B. Fixing the problem - Install the applicable patch: HP-UX revision 10.01 HP9000 Series 7/800 PHSS_16646 HP-UX revision 10.10 HP9000 Series 7/800 PHSS_16647 HP-UX revision 10.20 HP9000 Series 7/800 PHSS_16648 HP-UX revision 11.00 HP9000 Series 7/800 PHSS_16649 Note - For HP-UX revisions prior to 10.01, update to 10.X, or 11.X and install the applicable patch. C. To subscribe to automatically receive future NEW HP Security Bulletins from the HP Electronic Support Center via electronic mail, do the following: Use your browser to get to the HP Electronic Support Center page at: http://us-support.external.hp.com (for US, Canada, Asia-Pacific, & Latin-America) http://europe-support.external.hp.com (for Europe) Login with your user ID and password (or register for one). Remember to save the User ID assigned to you, and your password. Once you are in the Main Menu: To -subscribe- to future HP Security Bulletins, click on "Support Information Digests". To -review- bulletins already released from the main Menu, click on the "Search Technical Knowledge Database." Near the bottom of the next page, click on "Browse the HP Security Bulletin Archive". Once in the archive there is another link to our current Security Patch Matrix. Updated daily, this matrix categorizes security patches by platform/OS release, and by bulletin topic. The security patch matrix is also available via anonymous ftp: us-ffs.external.hp.com ~ftp/export/patches/hp-ux_patch_matrix D. To report new security vulnerabilities, send email to security-alert@hp.com Please encrypt any exploit information using the security-alert PGP key, available from your local key server, or by sending a message with a -subject- (not body) of 'get key' (no quotes) to security-alert@hp.com. Permission is granted for copying and circulating this Bulletin to Hewlett-Packard (HP) customers (or the Internet community) for the purpose of alerting them to problems, if and only if, the Bulletin is not edited or changed in any way, is attributed to HP, and provided such reproduction and/or distribution is performed for non-commercial purposes. Any other use of this information is prohibited. HP is not liable for any misuse of this information by any third party. ________________________________________________________________________ - -----End of Document ID: HPSBUX9810-086-------------------------------------- [ End Hewlett-Packard Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Hewlett-Packard 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. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), call the CIAC voice number 925-422-8193 and leave a message, or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC duty person, and the secondary PIN number, 8550074 is for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. 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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. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) J-005: SGI IRIX at(1) Vulnerability J-006: NFS mountd Buffer Overflow Vulnerability J-007: HP OpenView Omniback II Vulnerability J-008: FreeBSD TCP RST Denial of Service Vulnerability J-009: Cisco IOS Command History Release at Login Prompt J-010: SGI Buffer Overflow Vulnerabilities ( xterm(1), Xaw library) J-011: Microsoft IE 4.01 Untrusted Scripted Paste (Cuartango Vul.) J-012: SGI IRIX routed(1M) Vulnerability J-013: SGI IRIX autofsd Vulnerability J-014: IBM AIX automountd Vulnerability -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNjjlyrnzJzdsy3QZAQHFcQQA4XxGn377oEfNy4z002QQ5Jt4B0Zuxah0 1mYMOnaKUWkDXtOJLgRxsVqCvaZVCGWE3rwJHjHpFGYKdPnshq+WKotx8z9pZA4e DbwfLkWpdVLP8A6yE11htbBEZjvBa4MeHnVON/gzOqyYOIbbLaqbi6k15wLaeBGY SH6pf12yNac= =amfC -----END PGP SIGNATURE-----