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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.073 -- Microsoft Security Bulletin MS01-007 (version 2.0) Patch Available for "Network DDE Agent Request" 19 February 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Network Dynamic Data Exchange (DDE) Vendor: Microsoft Operating System: Windows 2000 Professional Windows 2000 Server Windows 2000 Advanced Server Impact: Execute Arbitrary Code/Commands Increased Privileges Administrator Compromise Access Required: Existing Account Remote Ref: ESB-2001.052 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: Patch Available for "Network DDE Agent Request" Vulnerability Released: 05 February 2001 Revised: 09 February 2001 (Version 2.0) Software: Windows 2000 Impact: Privilege elevation Bulletin: MS01-007 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS01-007.asp. - - ---------------------------------------------------------------------- Reason for Revision: ===================== The original version of this bulletin stated that terminal servers are not affected by the vulnerability. We have subsequently found that they actually are affected, and have updated both the bulletin and the narrative below to reflect this. The patch provided in the bulletin can be applied to terminal servers. Issue: ====== Network Dynamic Data Exchange (DDE) is a technology that enables applications on different Windows computers to dynamically share data. This sharing is effected via communications channels called trusted shares, which are managed by a service called the Network DDE Agent. By design, processes on the local machine can levy requests upon the Network DDE Agent, including ones that indicate what application should be run in conjunction with a particular trusted share. However, a vulnerability exists because, in Windows 2000, the Network DDE Agent runs using the Local System security context and processes all requests using this context, rather than that of the user. This would give an attacker an opportunity to cause the Network DDE Agent to run code of her choice in Local System context, as a means of gaining complete control over the local machine. Microsoft recommends that customers using Windows 2000 workstations or who allow unprivileged users to run code on Windows 2000 servers apply the patch immediately. In addition, customers operating Windows 2000 web servers should consider applying the patch to those machines as well, as a precautionary measure. If an attacker were able to gain the ability to run code in a restricted context on a web server via another vulnerability, this vulnerability would provide a way to immediately elevate her privileges and cause broader damage. Mitigating Factors: ==================== - Servers could only be affected if the attacker were given the ability to load a program of her choice onto the machine and execute it locally. Best practices recommend against this. - The machines primarily at risk, workstations and terminal servers, typically would not provide a way for the attacker to use control over the local machine to gain domain-wide privileges Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin http://www.microsoft.com/technet/security/bulletin/ms01-007.asp for information on obtaining this patch. Acknowledgment: =============== - Dildog of @Stake (http://www.atstake.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 Personal Privacy 6.5.3 iQEVAwUBOoSTjY0ZSRQxA/UrAQF7bgf7B+OTfB/db4CUH8qlNzGP4R8jiUIAMb8Y xqHcP/AfgHMicKqnS2ixUWT1KHOmDU+iVUjah1HmnMy7SBND0JbUyB1MaQ7wVW0z xmDwEM013T74FFbpQo/jahjIIwx5FWYbLpEyHhTYDupXU5i99B4lSeCEKuxnXuiE i07dO8idZ5ioTK+Lu/kFkYPy7tY3ELB34c9MwORyBv6JFsSyhjuBtzKObKivXLCC loBJWo7fJGIuCtwZ4xsb1hGzBeZTXpJn+HjTnHSc3t9LWSI+j+c7432Zc0REO8EU YKHP/AQK80H2fN/TmmRdOLlWLdgKNDIR9yPWBsQLEogNVO5R+jRBwg== =FpiH - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html 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 emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBOpEDhyh9+71yA2DNAQGp3wP+NYKszkRJHbpo/KQ6f8yTH7rqkHxzqvMz uaA1Mb1/HTp1pwydtTO8+w/ui/2tQz8dY89x942vUZClpV6LsAYFBsY1suo2Aook itVlXlGOj32DT1Wxg5OK+HvGvNwTFCaEICjmslyhXNep/rCgSiwZfd3R+FNljdM3 Yznz1D2tWnI= =LI5D -----END PGP SIGNATURE-----