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Vulnerability Assessment Details
Allaire JRun directory browsing vulnerability
Detailed Explanation for this Vulnerability Assessment
Allaire JRun 3.0/3.1 under a Microsoft IIS 4.0/5.0 platform has a
problem handling malformed URLs. This permits 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:
This vulnerability permits 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)
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
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.
Network Security Threat Level: Medium
Networks Security ID: 3592
Vulnerability Assessment Copyright: This script is Copyright (C) 2001 Felix Huber
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