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CERT Summary CS-2001-04

   November 20, 2001

   Each quarter, the CERT Coordination Center (CERT/CC) issues the CERT
   Summary to draw attention to the types of attacks reported to our
   incident response team, as well as other noteworthy incident and
   vulnerability information. The summary includes pointers to sources of
   information for dealing with the problems.

   Past CERT summaries are available from:

          CERT Summaries
          http://www.cert.org/summaries/
   ______________________________________________________________________

   Recent Activity

   Since the last regularly scheduled CERT summary, issued in August 2001
   (CS-2001-03), we have seen a new worm known as "Nimda," as well as
   active exploitation of a vulnerability in Microsft DNS servers. In
   addition, we have published a paper on denial of service trends,
   issued a new PGP key, and updated the UNIX Security Checklist.

   For more current information on activity being reported to the
   CERT/CC, please visit the CERT/CC Current Activity page. The Current
   Activity page is a regularly updated summary of the most frequent,
   high-impact types of security incidents and vulnerabilities being
   reported to the CERT/CC. The information on the Current Activity page
   is reviewed and updated as reporting trends change.

          CERT/CC Current Activity
          http://www.cert.org/current/current_activity.html

    1. W32/Nimda Worm

       Over the past several months, we have received reports of
       malicious code known as the "W32/Nimda Worm." This worm can
       propogate itself via several methods, including email, network
       shares, or by visiting an infected web site. On September 18, the
       CERT/CC issued an advisory on Nimda.

                CERT Advisory CA-2001-26: Nimda Worm
                http://www.cert.org/advisories/CA-2001-26.html

    2. Exploitation of Vulnerability in
       SSH1 CRC-32 Compensation Attack Detector

       The CERT/CC has received multiple reports of systems being
       compromised via the CRC-32 compensation attack detector
       vulnerability (VU#945216). On November 5, the CERT/CC released an
       incident note which describes system compromises via a
       vulnerability in the SSH1 (Secure Shell Protocol v1) CRC-32 attack
       detection code. Consequentially, we are also receiving reports of
       increased scanning activity for the SSH service (22/tcp).

                Incident Note IN 2001-12: Exploitation of vulnerability
                in SSH1 CRC-32 compensation attack detector
                http://www.cert.org/incident_notes/IN-2001-12.html

                Vulnerability Note #945216: SSH CRC32 attack detection
                code contains remote integer overflow
                http://www.kb.cert.org/vuls/id/945216

    3. DNS Cache Poisoning in Microsoft DNS Servers

       The CERT/CC has received reports from sites experiencing cache
       corruption on systems running Microsoft DNS Server. We issued an
       incident note which describes this corruption and its impact on
       systems. The default configuration of this software allows data
       from malicious or incorrectly configured DNS servers to be cached
       by a Microsoft DNS server. This corruption can result in erroneous
       DNS information being returned to clients which use this server.

                Incident Note IN-2001-11: Cache Corruption on Microsoft
                DNS Servers
                http://www.cert.org/incident_notes/IN-2001-11.html

                Vulnerability Note #109475: Microsoft Windows NT and 2000
                Domain Name Servers allow non-authoritative RRs to be
                cached by default
                http://www.kb.cert.org/vuls/id/109475

    4. Trends In Denial Of Service Attack Technology

       This paper describes the current and possible future states of
       denial of service (DoS) technology. This document is in Adobe
       Acrobat format, and requires Acrobat Reader.

                Trends In Denial Of Service Attack Technology
                http://www.cert.org/archive/pdf/DoS_trends.pdf
   ______________________________________________________________________

   UNIX Security Checklist Version 2.0

   The CERT Coordination Center and the Australian Computer Emergency
   Response Team (AusCERT) have jointly published version 2.0 of the UNIX
   Security Checklist which details steps to improve the security of UNIX
   Operating Systems. We encourage system administrators to review all
   sections of this document and, if appropriate, modify their systems
   accordingly to fix potential weaknesses.

          AUSCERT UNIX Security Checklist
          http://www.cert.org/tech_tips/AUSCERT_checklist2.0.html
   ______________________________________________________________________

   New CERT/CC PGP Key

   On October 1, the CERT/CC issued a new PGP key, which should be used
   when sending sensitive information to the CERT/CC.

          CERT/CC PGP Public Key
          https://www.cert.org/pgp/cert_pgp_key.asc
          Sending Sensitive Information To The CERT/CC

          http://www.cert.org/contact_cert/encryptmail.html
   ______________________________________________________________________

   What's New and Updated

   Since the last CERT Summary, we have published new and updated
     * Advisories
       http://www.cert.org/advisories/
     * Congressional Testimony
       http://www.cert.org/congressional_testimony/
     * Incident Notes
       http://www.cert.org/incident_notes/
     * CERT/CC Statistics
       http://www.cert.org/stats/cert_stats.html
     * Tech Tips
       http://www.cert.org/tech_tips/
     * Training Schedule
       http:/www.cert.org/training/
     * UNIX Security Checklist v2.0
       http://www.cert.org/tech_tips/unix_security_checklist2.0.html
   ______________________________________________________________________

   This document is available from:
   http://www.cert.org/summaries/CS-2001-04.html
   ______________________________________________________________________

   CERT/CC Contact Information

   Email: certcert.org
          Phone: +1 412-268-7090 (24-hour hotline)
          Fax: +1 412-268-6989
          Postal address:
          CERT Coordination Center
          Software Engineering Institute
          Carnegie Mellon University
          Pittsburgh PA 15213-3890
          U.S.A.

   CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) /
   EDT(GMT-4) Monday through Friday; they are on call for emergencies
   during other hours, on U.S. holidays, and on weekends.

    Using encryption

   We strongly urge you to encrypt sensitive information sent by email.
   Our public PGP key is available from

   http://www.cert.org/CERT_PGP.key

   If you prefer to use DES, please call the CERT hotline for more
   information.

    Getting security information

   CERT publications and other security information are available from
   our web site

   http://www.cert.org/

   To subscribe to the CERT mailing list for advisories and bulletins,
   send email to majordomocert.org. Please include in the body of your
   message

   subscribe cert-advisory

   * "CERT" and "CERT Coordination Center" are registered in the U.S.
   Patent and Trademark Office.
   ______________________________________________________________________

   NO WARRANTY
   Any material furnished by Carnegie Mellon University and the Software
   Engineering Institute is furnished on an "as is" basis. Carnegie
   Mellon University makes no warranties of any kind, either expressed or
   implied as to any matter including, but not limited to, warranty of
   fitness for a particular purpose or merchantability, exclusivity or
   results obtained from use of the material. Carnegie Mellon University
   does not make any warranty of any kind with respect to freedom from
   patent, trademark, or copyright infringement.
     _________________________________________________________________

   Conditions for use, disclaimers, and sponsorship information

   Copyright ©2001 Carnegie Mellon University.

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