https://issues.apache.org/bugzilla/show_bug.cgi?id=56879

            Bug ID: 56879
           Summary: Information disclosure
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Other Modules
          Assignee: [email protected]
          Reporter: [email protected]

I found that if an request is made to the server like:

GET %5c HTTP/1.1
Host: localhost

If the server is under linux, the response will be 
HTTP/1.1 400 Bad Request

If the server is under windows, the response will be 
HTTP/1.1 404 Not Found

It helps for OS fingerprinting and is the first part of an penetration testing.


I know is a low security problem, but I think is important to be fixed.

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