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List: dragonidsuser
Subject: [Dragonidsuser] FW: CERT Advisory CA-2003-09 Buffer Overflow in Microsoft IIS 5.0
From: "Dalnodar, Sean" <SDalnodar () seic ! com>
Date: 2003-03-18 15:40:27
[Download RAW message or body]
Just curious if anyone has written a signature that has successfully
identified this attack, and wouldn't mind posting a sanitized copy of
the intercept.
At this time, we are using the following signature based off of
information in the CERT Advisory below. Right now the signature is
pretty generic, looking only for ntdll.dll in web traffic. I would like
to "tighten" this signature a bit but fear it would become ineffective
without further knowledge of the attack.
What we are using at this time:
T D A S 200 0 W IIS:NTDLL.DLL ntdll/2Edll
I am assuming the attack would look sort of like, GET
/kernel32/ntdll.dll?xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx....
(malicious commands)
Thanks for any input.
-----BEGIN PGP SIGNED MESSAGE-----
CERT Advisory CA-2003-09 Buffer Overflow in Microsoft IIS 5.0
Original issue date: March 17, 2003
Last revised: --
Source: CERT/CC
A complete revision history is at the end of this file.
Systems Affected
* Systems running Microsoft Windows 2000 with IIS 5.0 enabled
Overview
A buffer overflow vulnerability exists in Microsoft IIS 5.0 running
on
Microsoft Windows 2000. IIS 5.0 is installed and running by default
on
Microsoft Windows 2000 systems. This vulnerability may allow a
remote
attacker to run arbitrary code on the victim machine.
An exploit is publicly available for this vulnerability,
which
increases the urgency that system administrators apply a patch.
I. Description
IIS 5.0 includes support for WebDAV, which allows users to
manipulate
files stored on a web server (RFC2518). A buffer
overflow
vulnerability exists in ntdll.dll (a portion of code utilized by
the
IIS WebDAV component). By sending a specially crafted request to
an
IIS 5.0 server, an attacker may be able to execute arbitrary code
in
the Local System security context, essentially giving the
attacker
compete control of the system.
Microsoft has issued the following bulletin regarding
this
vulnerability:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/sec
urity/bulletin/ms03-007.asp
This vulnerability has been assigned the identifier CAN-2003-0109
by
the Common Vulnerabilities and Exposures (CVE) group:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0109
II. Impact
Any attacker who can reach a vulnerable web server can gain
complete
control of the system and execute arbitrary code in the Local
System
security context. Note that this may be significantly more
serious
than a simple "web defacement."
III. Solution
Apply a patch from your vendor
A patch is available from Microsoft at
http://microsoft.com/downloads/details.aspx?FamilyId=C9A38D45-5145-4844-
B62E-C69D32AC929B&displaylang=en
Disable vulnerable service
Until a patch can be applied, you may wish to disable IIS.
To
determine if IIS is running, Microsoft recommends the following:
Go to Start | Settings | Control Panel | Administrative Tools |
Services.
If the World Wide Web Publishing service is listed then IIS
is installed
To disable IIS, run the IIS lockdown tool. This tool is
available
here:
http://www.microsoft.com/downloads/release.asp?ReleaseID=43955
If you cannot disable IIS, consider using the IIS lockdown tool
to
disable WebDAV (removing WebDAV can be specified when running the
IIS
lockdown tool). Alternatively, you can disable WebDAV by following
the
instructions located in Microsoft's Knowledgebase Article 241520,
"How
to Disable WebDAV for IIS 5.0":
http://support.microsoft.com/default.aspx?scid=kb;en-us;241520
Restrict buffer size
If you cannot use either IIS lockdown tool or URLScan,
consider
restricting the size of the buffer IIS utilizes to process requests
by
using Microsoft's URL Buffer Size Registry Tool. This tool can be
run
against a local or remote Windows 2000 system running Windows
2000
Service Pack 2 or Service Pack 3. The tool, instructions on how to
use
it, and instructions on how to manually make changes to the
registry
are available here:
URL Buffer Size Registry Tool -
http://go.microsoft.com/fwlink/?LinkId=14875
Microsoft Knowledge Base Article 816930 -
http://support.microsoft.com/default.aspx?scid=kb;en-us;816930
Microsoft Knowledge Base Article 260694 -
http://support.microsoft.com/default.aspx?scid=kb;en-us;260694
You may also wish to use URLScan, which will block web requests
that
attempt to exploit this vulnerability. Information about URLScan
is
available at:
http://support.microsoft.com/default.aspx?scid=kb;[LN];326444
Appendix A. Vendor Information
This appendix contains information provided by vendors. When
vendors
report new information, this section is updated and the changes
are
noted in the revision history. If a vendor is not listed below,
we
have not received their comments.
Microsoft Corporation
Please see Microsoft Security Bulletin MS03-007.
_________________________________________________________________
Author: Ian A. Finlay
______________________________________________________________________
This document is available from:
http://www.cert.org/advisories/CA-2003-09.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 2003 Carnegie Mellon University.
Revision History
March 17, 2003: Initial release
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