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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0389 -- Microsoft Security Bulletin MS03-019 REVISED Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (817772) 02 June 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows Media Services Publisher: Microsoft Operating System: Windows 2000 Windows NT Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote CVE Names: CAN-2003-0227 Ref: ESB-2003.0382 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ------------------------------------------------------------------- Title: Flaw in ISAPI Extension for Windows Media Services Could Cause Code Execution (817772) Date: 28 May 2003 Software: Microsoft(r) Windows NT(r) 4.0, and Windows(r) 2000 Impact: Allow an attacker to execute code of their choice Max Risk: Important Bulletin: MS03-019 Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS03-019.asp http://www.microsoft.com/security/security_bulletins/ms03-019.asp - - ------------------------------------------------------------------- Reason for Revision: ==================== On May 28th, Microsoft released the initial version of this bulletin, rating the severity of the vulnerability as Moderate. Subsequent to that release we have determined that the actions an attacker could take as a result of exploiting this vulnerability could include the ability to execute arbitrary code. As a result Microsoft has reissued this bulletin and changed the severity rating to Important. The original corrects the vulnerability and is not being re-released. Issue: ====== Microsoft Windows Media Services is a feature of Microsoft Windows 2000 Server, Advanced Server, and Datacenter Server and is also available as a downloadable version for Windows NT 4.0 Server. Windows Media Services contain support for a method of delivering media content to clients across a network known as multicast streaming. In multicast streaming however, the server has no connection or knowledge of the clients that may be receiving the stream coming from the server. To facilitate logging of client information for the server Windows 2000 includes a capability specifically designed for that purpose. To help with this problem, Windows 2000 includes logging capabilities for multicast and unicast transmissions. This capability is implemented as an Internet Services Application Programming Interface (ISAPI) extension - nsiislog.dll. When Windows Media Services are installed in Windows NT 4.0 Server or added through add/remove programs to Windows 2000, nsiislog.dll is installed to the Internet Information Services (IIS) Scripts directory on the server. There is a flaw in the way in which nsiislog.dll processes incoming requests. A vulnerability exists because an attacker could send specially formed 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, and must be downloaded to install on Windows NT 4.0. 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, and must be downloaded to install on Windows NT 4.0. - Windows Media Services are not available for Windows 2000 Professional or Windows NT 4.0 Workstation - The attacker would have to know which server on the network Windows Media Services had been installed on. Risk Rating: ============ Moderate Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletins at http://www.microsoft.com/technet/security/bulletin/ms03-019.asp http://www.microsoft.com/security/security_bulletins/ms03-019.asp for information on obtaining this patch. Acknowledgment: =============== - Brett Moore (brett@softwarecreations.co.nz) - - ------------------------------------------------------------------- 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 iQEVAwUBPte/7I0ZSRQxA/UrAQHPlwf/Tj5LV/X1JyNN8ioCm06pvrbM7PWJDq2W 22hDXp6L9QnBmaCKEwsznkE1p43tqEm14D5EvGiunuCTRqT5kB57xG6rq7u6uuyh GnTnPtGDsvKf1PuImARd+jYowwoQBmxouNfuNz0PVqnCbEfxXMZQRyZsWyqpWb6+ +tfB9stg0LlPij/6Rf34xpSQEptzKHkuv4wACiNEk6SOENvuO5YfakfhWb7+1pSt jJT0MaStts4O2hPKoRKNW8t4JhpDScfYZUy9OQV7I+221LT/MQNDc4guKFLvDZh4 polZobWlPyw2Yu+bNH9wDbm0EIrAQm7cOfjSN77brr8VuuxjtFOmHg== =8a7L - -----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----- Version: 2.6.3i Charset: noconv Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPtsoAyh9+71yA2DNAQG1TQP/VYgajKvsOHcnu1SnlL5JQQT8Urk254kG eACZx5duYStHhXj7LCz2BXjnW5LcR0maRLvLgkXr4j9YWom4yNsPndSnC5Mc1bvd mtjE8cwqIZAbjxrZjD5GxwCf4gp3piKrs0TM8CoyR1yZoU/TIDo949XWgzTrPKy/ guL/wBxeA2s= =lEHP -----END PGP SIGNATURE-----