---------- Forwarded message ---------- From: HP Electronic Support Center To: security_info@us-support2.external.hp.com Date: Tue, 24 Feb 1998 06:51:42 -0500 Subject: Security Bulletins Digest HP Support Information Digests =============================================================================== o HP Electronic Support Center World Wide Web Service --------------------------------------------------- If you subscribed through the HP Electronic Support Center and would like to be REMOVED from this mailing list, access the HP Electronic Support Center on the World Wide Web at: http://us-support2.external.hp.com Login using your HP Electronic Support Center User ID and Password. Then select Support Information Digests. You may then unsubscribe from the appropriate digest. =============================================================================== Digest Name: Daily Security Bulletins Digest Created: Tue Feb 24 6:00:09 EST 1998 Table of Contents: Document ID Title --------------- ----------- HPSBUX9801-076 Security Vulnerability with land on HP-UX The documents are listed below. ------------------------------------------------------------------------------- Document ID: HPSBUX9801-076 Date Loaded: 980224 Title: Security Vulnerability with land on HP-UX ------------------------------------------------------------------------- **REVISED 02** HEWLETT-PACKARD SECURITY BULLETIN: #00076, 21 January 1998 Last Revised: 23 February 1998 ------------------------------------------------------------------------- The information in the following Security Bulletin should be acted upon as soon as possible. Hewlett-Packard 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: A TCP SYN packet with target host's address as both source and destination can cause system hangs. PLATFORM: HP9000 Series 7/800 running HP-UX releases 9.X, 10.X, and 11.00. DAMAGE: Users on the network can cause system hangs. SOLUTION: Apply patches listed below. AVAILABILITY: All patches are available now. CHANGE SUMMARY: R1 Adds patches for HP-UX release 10.24 (VVOS) R2 Adds patches for HP-UX release 10.16 (CMW BLS) ------------------------------------------------------------------------- I. A. Background CERT Advisory CA-97.28 discusses the widely available "land" program, a denial of service tool that is effective against HP-UX systems. land sends carefully crafted TCP packets (the source and destination are identical). **REVISED 02** B. Fixing the problem The problem can be fixed by applying the appropriate cumulative ARPA Transport patch mentioned below. HP-UX release 11.00 HP9000 Series 700/800 PHNE_14017 HP-UX release 10.30 HP9000 Series 700/800 PHNE_13671 HP-UX release 10.20 HP9000 Series 800 PHNE_13468 HP-UX release 10.24 HP9000 Series 700 PHNE_13888 HP-UX release 10.24 HP9000 Series 800 PHNE_13889 HP-UX release 10.20 HP9000 Series 800 PHNE_13468 HP-UX release 10.20 HP9000 Series 700 PHNE_13469 ---->>HP-UX release 10.16 HP9000 Series 700 PHKL_14242 ---->>HP-UX release 10.16 HP9000 Series 800 PHKL_14243 HP-UX release 10.10 HP9000 Series 800 PHNE_13470 HP-UX release 10.10 HP9000 Series 700 PHNE_13471 HP-UX release 10.01 HP9000 Series 800 PHNE_13472 HP-UX release 10.01 HP9000 Series 700 PHNE_13473 HP-UX release 10.00 HP9000 Series 800 PHNE_13474 HP-UX release 10.00 HP9000 Series 700 PHNE_13475 HP-UX release 9.04 HP9000 Series 800 PHNE_13476 HP-UX release 9.0[3,5,7] HP9000 Series 700 PHNE_13477 HP-UX release 9.01 HP9000 Series 700 PHNE_13478 HP-UX release 9.00 HP9000 Series 800 PHNE_13479 C. Impact of the patch The patch changes the implementation of the ISO OSI stack such that the host now enforces the rule that inbound packets are never from itself - if packets claim otherwise, they are simply dropped. D. To subscribe to automatically receive future NEW HP Security Bulletins from the HP Electronic Support Center via electronic mail, do the following: User 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) Click on the Technical Knowledge Database, register as a user (remember to save the User ID assigned to you, and your password), and it will connect to a HP Search Technical Knowledge DB page. Near the bottom is a hyperlink to our Security Bulletin archive. Once in the archive there is another link to our current security patch matrix. Updated daily, this matrix is categorized by platform/OS release, and by bulletin topic. F. 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: HPSBUX9801-076-------------------------------------- -+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+ This message was posted through the FIRST mailing list server. If you wish to unsubscribe from this mailing list, send the message body of "unsubscribe first-teams" to first-majordomo@FIRST.ORG -+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+#+--+