exploit the possibilities

exchange.ldap.txt

exchange.ldap.txt
Posted Aug 17, 1999
Authored by X-Force

Buffer overflow in Microsoft Exchange's LDAP (Lightweight Directory Access Protocol) server allows read access to the Exchange server directory by using an LDAP client. Remote arbitrary code execution and Denial of Service attacks possible. Patch available.

tags | exploit, remote, denial of service, overflow, arbitrary, code execution, protocol
MD5 | b4359f9fb45f3a589a661ba72ffa6996

exchange.ldap.txt

Change Mirror Download
Date: Mon, 15 Mar 1999 21:55:24 -0500 (EST)
From: X-Force <xforce@iss.net>
To: alert@iss.net
Cc: X-Force <xforce@iss.net>
Subject: ISSalert: ISS Security Advisory: LDAP Buffer overflow against Microsoft Directory Services

TO UNSUBSCRIBE: email "unsubscribe alert" in the body of your message to
majordomo@iss.net Contact alert-owner@iss.net for help with any problems!
---------------------------------------------------------------------------


-----BEGIN PGP SIGNED MESSAGE-----

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 vulnerablility 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.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3a
Charset: noconv

iQCVAwUBNu3GuzRfJiV99eG9AQF48wP+J1/vW040sA5f9Nz56JEF9s6d/tpainG1
Qw7Jxbry374IFinJZfk/K5FJkdbjJfMcyGfgWJjNriYZJ0EKFkQcRK7XNAUe8AGu
LWaBW4l0v1Qox3ueR3GdCskQ8haK9vpxkFkbPmlefIWKMsVhncQPloJwU3/WyPNV
uLJBWqHEpkU=
=Zp+/
-----END PGP SIGNATURE-----

------------------------------------------------------------------------------

Date: Tue, 16 Mar 1999 22:28:11 -0800
From: aleph1@UNDERGROUND.ORG
To: BUGTRAQ@netspace.org
Subject: Microsoft Security Bulletin (MS99-009)

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 (MS99-009)
--------------------------------------

Patch Available for "Malformed Bind Request" Vulnerability

Originally Posted: March 16, 1999

Summary
=======
Microsoft has released a patch that eliminates a vulnerability in the LDAP
Bind function for Microsoft (r) Exchange (r) 5.5. The vulnerability could
allow denial of service attacks against an Exchange server or, under certain
conditions, could allow arbitrary code to be run on the server.

A fully supported patch is available, and Microsoft recommends that
customers who are at risk from this attack download and install it.

Issue
=====
The Bind function in the Exchange 5.5 Directory Service has an unchecked
buffer that poses two threats to safe operation. The first is a denial of
service threat. A malformed Bind request could overflow the buffer, causing
the Exchange Directory service to crash. The server would not need to be
rebooted, but the Exchange Directory service, and possibly dependent
services as well, would need to be restarted in order to resume messaging
service. The second threat is more esoteric and would be far more difficult
to exploit. A carefully-constructed Bind request could cause arbitrary code
to execute on the server via a classic buffer overrun technique. Neither
attack could occur accidentally.

Customers who are using Exchange but who have turned off LDAP support in the
Directory Service are not at risk from this vulnerability. Customers also
can reduce their vulnerability to attacks from external sources by filtering
incoming packets destined for TCP port 389, the LDAP service port.

Microsoft has no reports of any customers being affected by this
vulnerability. However, Microsoft is proactively releasing a patch that
corrects the problem.

Affected Software Versions
==========================
- Microsoft Exchange Server 5.5

What Microsoft is Doing
=======================
Microsoft has released patches that fix the problem identified. The patches
are available for download from the sites listed below in What Customers
Should Do.

Microsoft also has sent this security bulletin to customers
subscribing to the Microsoft Product Security Notification Service.
See http://www.microsoft.com/security/services/bulletin.asp for
more information about this free customer service.

Microsoft has published the following Knowledge Base (KB) article on this
issue:
- Microsoft Knowledge Base (KB) article Q221989,
XADM: Buffer Overrun in Exchange 5.5 LDAP Service,
http://support.microsoft.com/support/kb/articles/q221/9/89.asp
(Note: It might take 24 hours from the original posting of
this bulletin for the KB article to be visible in the Web-based
Knowledge Base.)

What Customers Should Do
========================
Microsoft highly recommends that customers evaluate the degree of risk that
this vulnerability poses to their systems and determine whether to download
and install the patch. The patch can be found at:
- X86-based Exchange:
ftp://ftp.microsoft.com/bussys/exchange/exchange-public/
fixes/Eng/Exchg5.5/PostSP2/DIR-fix/PSP2DIRI.EXE
- Alpha-based Exchange:
ftp://ftp.microsoft.com/bussys/exchange/exchange-public/
fixes/Eng/Exchg5.5/PostSP2/DIR-fix/PSP2DIRA.EXE

(Note: The above URLs have been wrapped for readability)

More Information
================
Please see the following references for more information related to this
issue.
- Microsoft Security Bulletin MS99-009,
Patch Available for "Malformed Bind Request"
Vulnerability (the Web-posted version of this bulletin),
http://www.microsoft.com/security/bulletins/ms99-009.asp.
- Microsoft Knowledge Base (KB) article Q221989,
XADM: Buffer Overrun in Exchange 5.5 LDAP Service.
http://support.microsoft.com/support/kb/articles/q221/9/89.asp
(Note: It might take 24 hours from the original posting of
this bulletin for the KB article to be visible in the Web-based
Knowledge Base.)

Obtaining Support on this Issue
===============================
If you require technical assistance with this issue, please
contact Microsoft Technical Support. For information on contacting
Microsoft Technical Support, please see
http://support.microsoft.com/support/contact/default.asp.

Revisions
=========
- March 16, 1999: Bulletin Created


For additional security-related information about Microsoft
products, please visit http://www.microsoft.com/security


------------------------------------------------------------------------

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS"
WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER
EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS
SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN
IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE
FOREGOING LIMITATION MAY NOT APPLY.

(c) 1999 Microsoft Corporation. All rights reserved. Terms of Use.

*******************************************************************
You have received this e-mail bulletin as a result of your registration
to the Microsoft Product Security Notification Service. You may
unsubscribe from this e-mail notification service at any time by sending
an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUEST@ANNOUNCE.MICROSOFT.COM
The subject line and message body are not used in processing the request,
and can be anything you like.

For more information on the Microsoft Security Notification Service
please visit http://www.microsoft.com/security/bulletin.htm. For
security-related information about Microsoft products, please visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

April 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Apr 1st
    21 Files
  • 2
    Apr 2nd
    35 Files
  • 3
    Apr 3rd
    21 Files
  • 4
    Apr 4th
    16 Files
  • 5
    Apr 5th
    15 Files
  • 6
    Apr 6th
    1 Files
  • 7
    Apr 7th
    2 Files
  • 8
    Apr 8th
    23 Files
  • 9
    Apr 9th
    19 Files
  • 10
    Apr 10th
    15 Files
  • 11
    Apr 11th
    14 Files
  • 12
    Apr 12th
    11 Files
  • 13
    Apr 13th
    2 Files
  • 14
    Apr 14th
    5 Files
  • 15
    Apr 15th
    14 Files
  • 16
    Apr 16th
    19 Files
  • 17
    Apr 17th
    19 Files
  • 18
    Apr 18th
    8 Files
  • 19
    Apr 19th
    4 Files
  • 20
    Apr 20th
    5 Files
  • 21
    Apr 21st
    1 Files
  • 22
    Apr 22nd
    0 Files
  • 23
    Apr 23rd
    0 Files
  • 24
    Apr 24th
    0 Files
  • 25
    Apr 25th
    0 Files
  • 26
    Apr 26th
    0 Files
  • 27
    Apr 27th
    0 Files
  • 28
    Apr 28th
    0 Files
  • 29
    Apr 29th
    0 Files
  • 30
    Apr 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close