Allaire JRun 3.0/3.1 under a Microsoft IIS 4.0/5.0 platform has a problem handling malformed URLs. This allows a remote user to browse the file system under the web root (normally \inetpub\wwwroot). Under Windows NT/2000(any service pack) and IIS 4.0/5.0: - JRun 3.0 (all editions) - JRun 3.1 (all editions) Upon sending a specially formed request to the web server, containing a '.jsp' extension makes the JRun handle the request. Example: http://www.victim.com/%3f.jsp This vulnerability allows anyone with remote access to the web server to browse it and any directory within the web root.
>From Macromedia Product Security Bulletin (MPSB01-13) http://www.allaire.com/handlers/index.cfm?ID=22236&Method=Full Macromedia recommends, as a best practice, turning off directory browsing for the JRun Default Server in the following applications: - Default Application (the application with '/' mapping that causes the security problem) - Demo Application Also, make sure any newly created web application that uses the '/' mapping has directory browsing off. The changes that need to be made in the JRun Management Console or JMC: - JRun Default Server/Web Applications/Default User Application/File Settings/Directory Browsing Allowed set to FALSE. - JRun Default Server/Web Applications/JRun Demo/File Settings/ Directory Browsing Allowed set to FALSE. Restart the servers after making the changes and the %3f.jsp request should now return a 403 forbidden. When this bug is fixed, the request (regardless of directory browsing setting) should return a '404 page not found'. The directory browsing property is called [file.browsedirs]. Changing the property via the JMC will cause the following changes: JRun 3.0 will write [file.browsedirs=false] in the local.properties file. (server-wide change) JRun 3.1 will write [file.browsedirs=false] in the webapp.properties of the application.
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