Allaire Security Bulletin (ASB00-07) Microsoft Internet Information Server Exposure of Source Code with Malformed Hit Highlighting Arguments Last Revision: April 10, 2000 Summary Microsoft has announced a vulnerability for Microsoft IIS which exposes the ability to use a malformed URL to read the source code of ASP, CFML, Perl and other files that are on a server. 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 This issue is clearly explained in the Microsoft Knowledge Base: "The ISAPI filter that implements the hit-highlighting (also known as "WebHits") functionality does not adequately constrain what files can be requested. If you provide a deliberately-malformed argument in a request to hit-highlight a document, it is possible to escape the virtual folder. This can allow someone without permissions to read any file residing on the same logical drive of the server that contains the Web Root folder. It does not allow anyone without permissions to add or modify files." For example, accessing the URL: http://www.yoursite.com/null.htw?CiWebHitsFile=/yourfile.asp%20&CiRestriction=none&CiHiliteType=Full may yield the contents of the file normally available at http://www.yoursite.com/yourfile.asp itself, not the processed results of the file. Affected Software Versions Any ColdFusion Server running on Microsoft Windows NT Server 4.0 or Microsoft Windows 2000 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 are several patches and workarounds available to correct this problem. These are detailed in the following Microsoft Knowledge base article (Q251170): http://www.microsoft.com/technet/support/kb.asp?ID=251170 Please note: this issue and patch may not be required for all IIS 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 April 10, 2000 -- Bulletin first released. 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: 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. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.