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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0443 -- Microsoft Security Bulletin MS03-022 Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (Q822343) 26 June 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows Media Services Publisher: Microsoft Operating System: Windows 2000 Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote CVE Names: CAN-2003-0349 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - - ------------------------------------------------------------------ Title: Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (822343) Date: 25 June 2003 Software: Microsoft(r) Windows(r) 2000 Impact: Allow an attacker to execute code of their choice Max Risk: Important Bulletin: MS03-022 Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS03-022.asp http://www.microsoft.com/security/security_bulletins/ms03-022.asp - - - ------------------------------------------------------------------ Issue: ====== Microsoft Windows Media Services is a feature of Microsoft Windows 2000 Server, Advanced Server, and Datacenter Server and is also available in a downloadable version for Windows NT 4.0 Server. Windows Media Services contains support for a method of delivering media content to clients across a network known as multicast streaming. In multicast streaming, the server has no connection to or knowledge of the clients that may be receiving the stream of media content coming from the server. To facilitate logging of client information for the server, Windows 2000 includes a capability specifically designed to enable logging for multicast transmissions. This logging capability is implemented as an Internet Services Application Programming Interface (ISAPI) extension - nsiislog.dll. When Windows Media Services are added through add/remove programs to Windows 2000, nsiislog.dll is installed in the Internet Information Services (IIS) Scripts directory on the server. Once Windows Media Services is installed, nsiislog.dll is automatically loaded and used by IIS. There is a flaw in the way nsiislog.dll processes incoming client requests. A vulnerability exists because an attacker could send specially formed HTTP request (communications) to the server that could cause IIS to fail or execute code on the user's system. Windows Media Services is not installed by default on Windows 2000. An attacker attempting to exploit this vulnerability would have to be aware which computers on the network had Windows Media Services installed on it and send a specific request to that server. Mitigating Factors: ==================== - Windows Media Services 4.1 is not installed by default on Windows 2000. - Windows Media Services are not available for Windows 2000 Professional. Risk Rating: ============ Important Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletins at http://www.microsoft.com/technet/security/bulletin/ms03-022.asp http://www.microsoft.com/security/security_bulletins/ms03-022.asp for information on obtaining this patch. Acknowledgment: =============== - Brett Moore (brett.moore@security-assessment.com) - - - ------------------------------------------------------------------ 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. - -----BEGIN PGP SIGNATURE----- Version: PGP 7.1 iQEVAwUBPvnLiY0ZSRQxA/UrAQHB+wgAkIHkxS7yvr0uRnuW8HLDQZGe2ejM38tP hB1FwHi2ngHwdmbFtXKTIJUxI3fR2juYJla0xy/lMbSbrPuEoGMt6KkbMEm+uhVO 8b47ot8c2oND0v+vwE75TvxVo1j8c+xA/s5NHBxSSi44NWV2Y1FT/tDOubtDDrM+ 9g+kLA20vrRZ8OctN17kN48Z8P8OUfLDbxxOMkGI1ISAe4WqGdzNUxXXSt/n3RrS gUKRWMYQmd4uIkXumMWfGYjV985H3TO+x4zMz4g4SS3mUZsjLkE+FaKc1Cjaikds lkuJxo9yeMIisgf7+p0ABaJ0WpQsCfp+2b3SyOieXGeY5JhYIP7KUQ== =Qv87 - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPvpLNyh9+71yA2DNAQE2+AP9ERwamgNZGu9rpiFywaqrLeQinYSBtYp0 JUDXrSpCqdBHpDvBcwIxw1eWMyU6f8o8jpO+9tL18LYxWS151yXAsJh8ke9IY/rR rah+lo6hZI4nWKUb4qcSRW6m47OoNozLen5JB1rATw1B70wAX0Q0npm+65KTzDo2 WQRCq0WOOYc= =QxjG -----END PGP SIGNATURE-----