Return-Path: cam@us-support.external.hp.com Date: Mon, 9 Apr 2001 07:56:04 -0700 (PDT) Message-Id: <200104091456.HAA20545@us-support.external.hp.com> Subject: security bulletins digest From: support_feedback@us-support.external.hp.com (IT Resource Center ) To: security_info@us-support.external.hp.com Reply-To: support_feedback@us-support.external.hp.com Errors-To: support_errors@us-support.external.hp.com Sender: cam@us-support.external.hp.com HP Support Information Digests =============================================================================== o IT Resource Center World Wide Web Service --------------------------------------------------- If you subscribed through the IT Resource Center and would like to be REMOVED from this mailing list, access the IT Resource Center on the World Wide Web at: http://www.itresourcecenter.hp.com/ Login using your IT Resource Center User ID and Password. Then select Support Information Digests (located under Maintenance and Support). You may then unsubscribe from the appropriate digest. =============================================================================== Digest Name: daily security bulletins digest Created: Mon Apr 9 5:40:03 PDT 2001 Table of Contents: Document ID Title --------------- ----------- HPSBUX0104-148 Sec. Vulnerability in xntpd(1M) The documents are listed below. ------------------------------------------------------------------------------- Document ID: HPSBUX0104-148 Date Loaded: 20010407 Title: Sec. Vulnerability in xntpd(1M) ------------------------------------------------------------------------- HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #0148, 06 Apr. '01 ------------------------------------------------------------------------- The information in the following Security Advisory 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 Advisory as soon as possible. ------------------------------------------------------------------------- PROBLEM: The HP-UX NTP daemon contains an exploitable vulnerability. PLATFORM: HP9000 Series 700/800 running HP-UX releases 10.XX and 11.XX. DAMAGE: Possible denial of service, increase of priviledge. SOLUTION: Install the workaround configuration detailed below. AVAILABILITY: Patches are currently being developed, whereupon this advisory will be upgraded to a bulletin. ------------------------------------------------------------------------- I. A. Background A buffer overflow has been discovered on various Unix-derived operating systems in its NTP daemon. Hewlett-Packard Company ships xntpd on HP-UX releases and has determined that it too, is vulnerable. B. Recommended solution Hewlett-Packard Company recommends that xntpd be shut down on all systems not absolutely needing time-of-day synchronization with Internet standard time servers. On those remaining time-sensitive systems modify the default configuration file (/etc/ntp.conf) to use the "restrict" clause, to restrict all but allow some. We provide an example of a simple configuration. Please refer to the man (1M) xntpd for further configuration details. # This server syncs from server 192.255.2.3 and provides # time services to client 192.27.16.30, yet # blocks all others. server 192.255.2.3 prefer server 127.127.1.1 # allow this client full access restrict 192.27.16.30 # allow this server full access restrict 192.255.2.3 # you need both of the following for the localhost restrict 127.0.0.1 restrict 127.127.1.1 # block everything else restrict default ignore NOTE: Patches are currently in development. C. 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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 Advisory to Hewlett-Packard (HP) customers (or the Internet community) for the purpose of alerting them to problems, if and only if, the Advisory 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: HPSBUX0104-148--------------------------------------