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S-99-21b.asc

S-99-21b.asc
Posted Jan 10, 2000

Subject 2nd Correction to Microsoft Security Bulletin

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===============================================================================
>> CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl. Links <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>> <<
>> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the <<
>> complete CERT-CC advisory texts: http://www.cert.org <<
===============================================================================
===============================================================================
Security Advisory CERT-NL
===============================================================================
Author/Source : Egon Verharen Index : S-99-21b
Distribution : World Page : 1
Classification: External Version: 1
Subject : 2nd Correction to Microsoft Security Bulletin
MS99-025 (S-99-21 en S-99-21a) Date : 25-Jul-99
===============================================================================

By courtesy of MICROSOFT we received information on a correction to MS Security
Bulletin MS99-025: Unauthorized Access to IIS Servers through ODBC Data Access
with RDS and the 1st correction to that bulletin.

Measured by the number of affected hosts, chances are, you are vulnerable too if
you installed IIS 4.0.

Now of course we could say something about corrections to corrections and
sending them out within a timeframe of a couple of days, but it only shows we
provide you with important information very (sometimes too) timely (and I am
sure this is Microsoft's answer too).
So we refrain from comments and CERT-NL recommends reading the advisory
carefully and apply the described patches.
Please also follow the NTBUGTRAQ mailinglist on this topic, especially the
following messages (archive URL's given below):

Subject: Alert: IIS RDS vulnerability and fix
Date: Fri, 23 Jul 1999 11:35:11 -0500
From: ".rain.forest.puppy." <rfp@WIRETRIP.NET>
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM


http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind9907&L=ntbugtraq&F=P&
S=&P=8667
(URL wrapped !)

Subject: Re: Alert: IIS RDS vulnerability and fix
Date: Fri, 23 Jul 1999 12:48:36 -0400
From: Russ <Russ.Cooper@RC.ON.CA>
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM


http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind9907&L=ntbugtraq&F=P&
S=&P=8559
(URL wrapped !)

Subject: Alert: Update to Microsoft Security Bulletin (MS99-025)
Date: Sat, 24 Jul 1999 12:05:19 -0400
From: Russ <Russ.Cooper@RC.ON.CA>
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM


http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind9907&L=ntbugtraq&F=P&
S=&P=8881
(URL wrapped !)

==============================================================================

Microsoft Security Bulletin (MS99-025)
- --------------------------------------

Re-Release: Unauthorized Access to IIS Servers through ODBC Data Access with
RDS

Originally Released as MS98-004: July 17, 1998
Re-Released as MS99-025: July 19, 1999
Revised: July 23, 1999

Summary
=======
Microsoft has identified a vulnerability in Microsoft(r) Data Access
Components (MDAC) that could allow a web site visitor to take unauthorized
actions on a web site hosted using Internet Information Server. The
vulnerability can be eliminated by reconfiguring or removing the affected
components of MDAC.


This vulnerability originally was reported in Microsoft Security Bulletin
MS98-004, issued July 17, 1998. It was re-released on July 19, 1999, to
remind customers of the need to address the vulnerability. It was updated on
July 23, 1999, to discuss the need to remove sample files that are affected
by the vulnerability, and to clarify that MDAC 2.0 is affected even if
deployed as a clean installation.


Frequently asked questions regarding this vulnerability can be found at
http://www.microsoft.com/security/bulletins/MS99-025faq.asp. The FAQ
contains instructions for eliminating the vulnerability.

Issue
=====
The RDS DataFactory object, a component of Microsoft Data Access Components
(MDAC), exposes unsafe methods. When installed on a system running Internet
Information Server 3.0 or 4.0, the DataFactory object may permit an
otherwise unauthorized web user to perform privileged actions, including:
- Allowing unauthorized users to execute shell commands on the
IIS system as a privileged user.
- On a multi-homed Internet-connected IIS system, using MDAC to
tunnel SQL and other ODBC data requests through the public
connection to a private back-end network.
- Allowing unauthorized accessing to secured, non-published
files on the IIS system.

Affected Software Versions
==========================
The vulnerability affects the Microsoft Data Access Components, when
installed on a web server running Internet Information Server 3.0 or 4.0.
Specifically:
- MDAC 1.5 and 2.0 are affected
- MDAC 2.1 is affected if installed as an upgrade from a
previous version of MDAC, rather than a clean installation
- Any version of MDAC is affected if Sample Pages for RDS are
installed.

NOTE: Sample Pages for RDS are provided as part of the Windows 4.0 Option
Pack and the MDAC 2.0 Software Development Kit. They are not installed by
default in the Option Pack, but are installed by default in the MDAC 2.0
SDK.

NOTE: MDAC 1.5 and IIS are installed by default installations of the Windows
NT 4.0 Option Pack.

NOTE: IIS can be installed as part of other Microsoft products, such as
Microsoft BackOffice and Microsoft Site Server. MDAC can be installed as
part of other Microsoft products, such as Visual C and Microsoft Office.

Patch Availability
==================
This vulnerability requires a configuration change to eliminate it,
rather than a patch. Details of the specific changes needed are available at

http://www.microsoft.com/security/bulletins/MS99-025faq.asp.

More Information
================
Please see the following references for more information related to this
issue.
- Microsoft Security Bulletin MS99-025: Frequently Asked Questions,
http://www.microsoft.com/security/bulletins/MS99-025faq.asp
- Microsoft Knowledge Base (KB) article Q184375,
Security Implications of RDS 1.5, IIS, and ODBC,
http://support.microsoft.com/support/kb/articles/q184/3/75.asp
- Microsoft Universal Data Access Download Page,
http://www.microsoft.com/data/download.htm
- Installing MDAC Q&A,
http://www.microsoft.com/data/MDAC21info/MDACinstQ.htm
- Microsoft Security Advisor web site,
http://www.microsoft.com/security/default.asp
- IIS Security Checklist,
http://www.microsoft.com/security/products/iis/CheckList.asp

Obtaining Support on this Issue
===============================
Microsoft Data Access Components (MDAC) is a fully supported set of
technologies. 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.

Acknowledgments
===============
Microsoft acknowledges Greg Gonzalez of ITE (http://www.ite.com) for
bringing additional information regarding this vulnerability to our
attention, and .Rain.Forest.Puppy for identifying the involvement of
Sample Pages for RDS. Microsoft also acknowledges Russ Cooper of NTBugTraq
(http://www.ntbugtraq.com) for his assistance around this issue.

Revisions
=========
- July 19, 1999: Bulletin Created as re-release of MS98-004.
- July 23, 1999: Bulletin updated to discuss involvement of Sample Pages
for RDS, and to clarify status of MDAC 2.0.

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


==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS
Phone: +31 302 305 305 BUSINESS HOURS ONLY
Fax: +31 302 305 329 BUSINESS HOURS ONLY
Snailmail: SURFnet bv
Attn. CERT-NL
P.O. Box 19035
NL - 3501 DA UTRECHT
The Netherlands

NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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