[1][USEMAP] [2][USEMAP] [3][LINK] Allaire Security Bulletin (ASB00-13) Microsoft (MS00-031): Patch Available for "Undelimited .HTR Request" and "File Fragment Reading via .HTR" Vulnerabilities Originally Posted: May 22, 2000 Last Updated: May 22, 2000 Summary Microsoft has released a patch that eliminates two security vulnerabilities in Microsoft(r) Internet Information Server. The vulnerabilities could, respectively, be used to slow an affected web server's response or to obtain the source code of certain types of files under very restricted conditions. This is not a problem with ColdFusion Server itself, but it is an issue that can affect ColdFusion users. Allaire recommends that customers follow the instructions posted on the Microsoft Web site to address this issue. Issue These issues are clearly explained in the Microsoft Security Bulletin: "The 'Undelimited .HTR Request' vulnerability is a denial of service vulnerability. If a malicious user provided a password change request that was missing an expected delimiter, the algorithm would conduct an unbounded search. This would prevent it from servicing additional .HTR requests, and could also slow the overall response of the server." And: "The '.HTR File Fragment Reading' vulnerability could allow fragments of certain types of files to be read by providing a malformed request that would cause the .HTR processing to be applied to them. However, the vulnerability could only be exploited under extremely restrictive conditions, and the most valuable data in the files would be the least likely to actually appear in the fragments sent to the user." Further: "Neither of these vulnerabilities would allow data to be added, deleted or changed on the server, nor would they allow any administrative control on the server to be usurped. Although .HTR files are used to allow web-based password administration, neither of these vulnerabilities involve[sic.] any weakness in password handling. Also, if security best practices have been followed, and unneeded script mappings have been removed, many customers will have removed the .HTR script mapping and thus be unaffected by either vulnerability." Affected Software Versions * Internet Information Server 4.0 * Internet Information Server 5.0 What Allaire is Doing This is not an Allaire product. We are recommending that customers reference the information at Microsoft's site to address this issue. What Customers Should Do There is a patch available to correct this problem. It is detailed in the following Microsoft Security Bulletin (MS00-031): [4]http://www.microsoft.com/technet/security/bulletin/ms00-031.asp Please note: this issue and patch may not be required for all users. Allaire customers should review all material in the Microsoft Security Bulletin and related documents carefully before applying the patch. As always, customers should test patch changes in a testing environment before modifying production servers. Revisions May 22, 2000 -- Bulletin first created. Reporting Security Issues Allaire is committed to addressing security issues and providing customers with the information on how they can protect themselves. If you identify what you believe may be a security issue with an Allaire product, please send an email to secure@allaire.com. We will work to appropriately address and communicate the issue. Receiving Security Bulletins When Allaire becomes aware of a security issue that we believe significantly affects our products or customers, we will notify customers when appropriate. Typically this notification will be in the form of a security bulletin explaining the issue and the response. Allaire customers who would like to receive notification of new security bulletins when they are released can sign up for our security notification service. For additional information on security issues at Allaire, please visit the Security Zone at: [5]http://www.allaire.com/security THE INFORMATION PROVIDED BY ALLAIRE IN THIS BULLETIN IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. ALLAIRE DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ALLAIRE CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF ALLAIRE CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 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