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ciac.j-036.ldap

ciac.j-036.ldap
Posted Sep 23, 1999

ciac.j-036.ldap

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ciac.j-036.ldap

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From ciac@rumpole.llnl.gov Fri Mar 19 13:17:13 1999
From: CIAC Mail User <ciac@rumpole.llnl.gov>
To: ciac-bulletin@rumpole.llnl.gov
Date: Thu, 18 Mar 1999 13:47:09 -0800 (PST)
Subject: CIAC Bulletin J-036: LDAP Buffer overflow against Microsoft Directory Services

[ For Public Release ]
-----BEGIN PGP SIGNED MESSAGE-----

__________________________________________________________

The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________

INFORMATION BULLETIN

LDAP Buffer overflow against Microsoft Directory Services

March 16, 1999 19:00 GMT Number J-036
______________________________________________________________________________
PROBLEM: ISS X-Force has a vulnerability against Microsoft Exchange's
LDAP (Lightweight Directory Access Protocol) server which
allows read access to the Exchange server directory by using an
LDAP client.
PLATFORM: Microsoft Exchange Server version 5.5.
DAMAGE: If exploited, an attacker could cause a buffer overflow which
could lead to a denial of service or allow the attacker to be
able to execute arbitrary code.
SOLUTION: Apply patch or workaround.
______________________________________________________________________________
VULNERABILITY Risk is medium. The packet to cause the buffer overflow would
ASSESSMENT: have to be a particular type or carefully crafted.
______________________________________________________________________________

[ Start ISS Advisory ]


ISS Security Advisory
March 15, 1999

LDAP Buffer overflow against Microsoft Directory Services

Synopsis:

ISS X-Force has discovered a buffer overflow exploit against Microsoft
Exchange's LDAP (Lightweight Directory Access Protocol) server which
allows read access to the Exchange server directory by using an LDAP
client. This buffer overflow consists of a malformed bind request that
overflows the buffer and can execute arbitrary code. This attack can also
cause the Exchange LDAP service to crash. This vulnerability exists in
Microsoft Exchange Server version 5.5.

Description:

This exploit occurs during the LDAP binding process. Binding involves
logging in or authenticating to a directory, and consists of sending a
username, a password, and a binding method. There are two methods in
which to use this vulnerability against an Exchange server. The first
consists of sending a particular type of invalid LDAP bind packet which
will cause an overflow to occur this will cause the LDAP service to crash.
The second uses a large malformed LDAP bind packet that is carefully
crafted to take advantage of the buffer overflow and can be used to
execute arbitrary code.

Recommendations:

Microsoft has made a patch available for the LDAP attack. Patch
information is available at:
http://www.microsoft.com/security/bulletins/ms99-009.asp

Network administrators can protect internal systems from external attack
by adding a rule to a filtering router or firewall of the type: Deny all
incoming TCP packets with a destination port of 389.

Many firewalls or packet filters may already have more restrictive
rulesets that already encompass this filtering rule, in which case the
network is already protected from an external attack. This ruleset would
include filtering all incoming traffic to TCP port 389.

Additional Information:

These vulnerabilities were primarily researched by the ISS X-Force.

________

Copyright (c) 1999 by Internet Security Systems, Inc.

Permission is hereby granted for the electronic redistribution of this
Security Advisory. It is not to be edited in any way without express
consent of the X-Force. If you wish to reprint the whole or any part of
this Security Advisory in any other medium excluding electronic medium,
please e-mail xforce@iss.net for permission.

Internet Security Systems, Inc. (ISS) is the leading provider of adaptive
network security monitoring, detection, and response software that
protects the security and integrity of enterprise information systems. By
dynamically detecting and responding to security vulnerabilities and
threats inherent in open systems, ISS's SAFEsuite family of products
provide protection across the enterprise, including the Internet,
extranets, and internal networks, from attacks, misuse, and security
policy violations. ISS has delivered its adaptive network security
solutions to organizations worldwide, including firms in the Global 2000,
nine of the ten largest U.S. commercial banks, and over 35 governmental
agencies. For more information, call ISS at 678-443-6000 or 800-776-2362
or visit the ISS Web site at http://www.iss.net.

Disclaimer
The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition. There
are NO warranties with regard to this information. In no event shall the
author be liable for any damages whatsoever arising out of or in
connection with the use or spread of this information. Any use of this
information is at the user's own risk.

X-Force PGP Key available at: http://www.iss.net/xforce/sensitive.html as
well as on MIT's PGP key server and PGP.com's key server.

X-Force Vulnerability and Threat Database: http://www.iss.net/xforce

Please send suggestions, updates, and comments to:
X-Force <xforce@iss.net> of Internet Security Systems, Inc.



[ End ISS Advisory ]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Internet Security Systems,
Inc. for the information contained in this bulletin.
______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@llnl.gov

For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 925-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

World Wide Web: http://www.ciac.org/
(or http://ciac.llnl.gov -- they're the same machine)
Anonymous FTP: ftp.ciac.org
(or ciac.llnl.gov -- they're the same machine)
Modem access: +1 (925) 423-4753 (28.8K baud)
+1 (925) 423-3331 (28.8K baud)

CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
3. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.

Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, spi-announce OR spi-notes for list-name:

E-mail to ciac-listproc@llnl.gov or majordomo@rumpole.llnl.gov:
subscribe list-name
e.g., subscribe ciac-bulletin

You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email. This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.

If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.

LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

J-026: HP-UX rpc.pcnfsd Vulnerability
J-027: Digital Unix Vulnerabilities ( at , inc )
J-028: Sun Solaris Vulnerabilities (sdtcm_convert, man/catman, CDE)
J-029: Buffer Overflows in Various FTP Servers
J-030: Microsoft BackOffice Vulnerability
J-031: Debian Linux "Super" package Buffer Overflow
J-032: Windows Backdoors Update II:
J-033: SIG X server font path Vulnerability
J-034: Cisco 7xx TCP and HTTP Vulnerabilities
J-035: Linux Blind TCP Spoofing




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