For our Windows NT friends:
-- Karen Ann Smith karenann@unm.edu Director, NMR Facility Adj. Asst. Prof. Dept. of Chemistry Clark Hall University of New Mexico Albuquerque, NM 87131 505.277.4031 url: http://www.unm.edu/~karenann Feed a hungry child with just a click!! http://www.thehungersite.com Join SETI for an out-of-this-world screen. http://setiathome.ssl.berkeley.edu/ May you celebrate the Winter Solstice season with joy and happiness according to your own customs. --------------99B1945BE62FD59FBDF9793A Content-Type: message/rfc822 Content-Transfer-Encoding: 7bit Content-Disposition: inlineReturn-Path: <owner-security-managers@list.unm.edu> Received: from lyra.unm.edu(localhost[127.0.0.1]) (7927 bytes) by lyra.unm.edu via sendmail with P:smtp/D:altuser/T:local (sender: <owner-security-managers@list.unm.edu> owner: <real-karenann>) id <m11yhHQ-00018UC@lyra.unm.edu> for <<karenann@unm.edu>>; Thu, 16 Dec 1999 13:13:40 -0700 (MST) (Smail-3.2.0.101 1997-Dec-17 #1 built 1999-Oct-14) Resent-Message-Id: <m11yhHQ-00018UC@lyra.unm.edu> Resent-Date: Thu, 16 Dec 1999 13:13:40 -0700 (MST) Received: from mlx3.unm.edu([129.24.8.189]) (7339 bytes) by lyra.unm.edu via sendmail with P:smtp/D:aliases_listserv/T:pipe (sender: <dave@unm.edu>) id <m11yhG4-00018BC@lyra.unm.edu> for <security-managers@list.unm.edu>; Thu, 16 Dec 1999 13:12:16 -0700 (MST) (Smail-3.2.0.101 1997-Dec-17 #1 built 1999-Oct-14) Received: (qmail 23827 invoked by uid 27593); 16 Dec 1999 20:12:14 -0000 Received: (qmail 23819 invoked from network); 16 Dec 1999 20:12:13 -0000 Received: from ben13.unm.edu (129.24.8.113) by mlx3.unm.edu with SMTP; 16 Dec 1999 20:12:13 -0000 Message-Id: <D1A11CCE78ADD111A35500805FD43F5867C270@RED-MSG-04> Date: Thu, 16 Dec 1999 11:47:11 -0800 Reply-To: security-managers@list.unm.edu Sender: owner-security-managers@list.unm.edu From: Microsoft Product Security <secnotif@MICROSOFT.COM> To: MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM Subject: Microsoft Security Bulletin (MS99-056) Resent-To: security-managers@unm.edu Resent-From: "David Grisham CIRT Security Admin." <dave@unm.edu> X-Sender: Microsoft Product Security Notification Service <MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM> X-Received: (qmail 23588 invoked by uid 5097); 16 Dec 1999 20:11:45 -0000 X-Received: (qmail 23547 invoked from network); 16 Dec 1999 20:11:44 -0000 X-Received: from grape.ease.lsoft.com (209.119.1.39) by mlx3.unm.edu with SMTP; 16 Dec 1999 20:11:44 -0000 X-Received: from guava (209.119.0.39) by grape.ease.lsoft.com (LSMTP for OpenVMS v1.1b) with SMTP id <8.00080465@grape.ease.lsoft.com>; Thu, 16 Dec 1999 14:53:01 -0500 X-Received: from ANNOUNCE.MICROSOFT.COM by ANNOUNCE.MICROSOFT.COM (LISTSERV-TCP/IP release 1.8d) with spool id 0678 for MICROSOFT_SECURITY@ANNOUNCE.MICROSOFT.COM; Thu, 16 Dec 1999 14:50:12 -0500 X-Received: from 131.107.3.121 by GUAVA.EASE.LSOFT.COM (SMTPL release 1.0d) with TCP; Thu, 16 Dec 1999 14:43:57 -0500 X-Received: from 157.54.9.108 by mail5.microsoft.com (InterScan E-Mail VirusWall NT); Thu, 16 Dec 1999 11:47:31 -0800 (Pacific Standard Time) X-Received: by INET-IMC-05 with Internet Mail Service (5.5.2650.21) id <Y0KGCKWL>; Thu, 16 Dec 1999 11:47:31 -0800 X-Mailer: Internet Mail Service (5.5.2650.21) X-Listprocessor-Version: 8.1 -- ListProcessor(tm) by CREN
The following is a Security Bulletin from the Microsoft Product Security Notification Service.
Please do not reply to this message, as it was sent from an unattended mailbox. ********************************
Microsoft Security Bulletin (MS99-056) --------------------------------------
Patch Available for "Syskey Keystream Reuse" Vulnerability Originally Posted: December 16, 1999
Summary ======= Microsoft has released a patch that eliminates a vulnerability in Syskey, a utility that provides additional protection for Microsoft(r) Windows NT(r) password databases. The vulnerability allows a particular cryptanalytic attack to be effective against Syskey, significantly reducing the strength of the protection it offers. The patch eliminates the vulnerability and restores strong protection to the password database.
Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/security/bulletins/MS99-056faq.asp.
Issue ===== Syskey is a utility that strongly encrypts the hashed password information in the SAM database in order to protect it against offline password cracking attacks. However, Syskey reuses the keystream used to perform some of the encryption. This significantly reduces the strength of the protection it provides by enabling a well-known cryptanalytic attack to be used against it.
A patch is available that eliminates the key reuse vulnerability and again makes it computationally infeasible to mount a brute-force attack against the SAM database when Syskey has been applied.
Affected Software Versions ========================== - Microsoft Windows NT Workstation 4.0 - Microsoft Windows NT Server 4.0 - Microsoft Windows NT Server 4.0, Enterprise Edition - Microsoft Windows NT Server 4.0, Terminal Server Edition
Patch Availability ================== - x86: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16798 - alpha: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16799
NOTE: Additional security patches are available at the Microsoft Download Center (www.microsoft.com/downloads)
More Information ================ Please see the following references for more information related to this issue. - Microsoft Security Bulletin MS99-056: Frequently Asked Questions, http://www.microsoft.com/security/bulletins/MS99-056faq.asp. - Microsoft Knowledge Base (KB) article Q248183, Syskey Utility Reuses Keystream, http://support.microsoft.com/support/kb/articles/q248/1/83.asp. (Note: It may take 24 hours from the original posting of this bulletin for this KB article to be visible.) - Microsoft Knowledge Base (KB) article Q143475, Windows NT System Key Permits Strong Encryption of the SAM, http://support.microsoft.com/support/kb/articles/q143/4/75.asp. - Microsoft Security Advisor web site, http://www.microsoft.com/security/default.asp.
Obtaining Support on this Issue =============================== This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/support/contact/default.asp.
Acknowledgments =============== Microsoft acknowledges Bindview's RAZOR Security Team (www.bindview.com) for bringing this issue to our attention.
Revisions ========= - December 16, 1999: Bulletin Created.
------------------------------------------------------------------------
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