Published:
28 March 2001
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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.126 -- Microsoft Security Bulletin MS01-018 Visual Studio VB-TSQL Object Contains Unchecked Buffer 29 March 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Visual Studio 6.0 Enterprise Edition Vendor: Microsoft Impact: Denial of Service Execute Arbitrary Code/Commands Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - - ---------------------------------------------------------------------- Title: Visual Studio VB-TSQL Object Contains Unchecked Buffer Date: 27 March 2001 Software: Visual Studio 6.0 Enterprise Edition Impact: Run code of attacker's choice Bulletin: MS01-018 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS01-018.asp. - - ---------------------------------------------------------------------- Issue: ====== The VB-TSQL debugger object that ships with Visual Studio 6.0 Enterprise Edition has an unchecked buffer in the code that processes parameters for one of the object's methods. Theobject can, by design, be programmatically accessed remotely. If the object were to be referenced by a program that contained specially malformed data within the parameter, eitherof two outcomes would result. In the less serious case, the attacker could cause the object to fail on the hosting machine. In the more serious case, the attacker could exploit the buffer overrun to run code of the attacker's choice on the hosting machine. The debugger object (vbsdicli.exe) is installed by default with Visual Studio 6.0 Enterprise Edition and runs in the context of the interactively logged-on user. The attacker could only execute a successful attack if he knew that a user had the component installed and that the user was logged in at the time of the attack. Mitigating Factors: =================== - If best practices have been followed and ports 137-139 and 445 have been blocked at an organization's router or firewall, this attack could not be executed from the Internet. - There is no way to determine remotely if a machine has the affected component installed. An attacker would need to successively target machines until he found one that was susceptible. - The vulnerability could only be exploited if an interactive user were logged on to the target machine at the time of the malicious user's attack. - Only the Enterprise Edition of Visual Studio 6.0 is affected. Visual Studio 6.0 Professional Edition is not affected. Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin http://www.microsoft.com/technet/security/bulletin/ms01-018.asp for information on obtaining this patch. Acknowledgment: =============== - BindView's Razor Team (http://razor.bindview.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. - --------------------------END INCLUDED TEXT-------------------- This security bulletin is provided as a service to AusCERT's members. 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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 iQCVAwUBOsNATih9+71yA2DNAQExIQP+LIpSl1qFIEG4GlLdmRkdSj7L3QA7PYLN ldfEcp3YfKgPRW2knwNxdOvn7xbfNXG/Ndzzv2xfICxejZCpb3seYEI5KABbBo/Q K6HEuCunRp4Q8+JgUcIdsWpVjYHRl7N17qERJPN9RhY99K95YTqruenubLdyRlud GY+1YSfOW3M= =NOjI -----END PGP SIGNATURE-----