7540094 2001-11-20 14:15 -0500 /221 rader/ CERT Advisory <cert-advisory@cert.org>
Sänt av: owner-root@lysator.liu.se
Importerad: 2001-11-20 22:47 av Brevbäraren
Extern mottagare: cert-advisory@cert.org
Mottagare: Bellman -- The Recursive Hacker <14586>
Mottaget: 2001-11-20 22:50
Mottagare: Bugtraq (import) <19826>
Sänt: 2001-11-21 02:42
Ärende: CERT Summary CS-2001-04
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From: CERT Advisory <cert-advisory@cert.org>
To: cert-advisory@cert.org
Message-ID: <CS-2001-04.1@cert.org>
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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: cert@cert.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 majordomo@cert.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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