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Thread: ridiculously long URL requested

  1. #1
    Join Date
    Jan 2007
    Adelaide, Australia

    ridiculously long URL requested

    Can it be considered a possible way to circumvent apache security by sending the server a super long request to attempt to overflow a buffer? I have had this turn up in my access log: - - [28/Mar/2007:18:09:25 +0930] "POST /_vti_bin/_vti_aut/fp30reg.dll HTTP/1.1" 406 280 "-" "-" - - [28/Mar/2007:18:09:26 +0930] "SEARCH /\x90\x04H\x04H\x04H\x04H\x04H\x04H\x04H\x04H\x04H\ x04...
    This x04H pattern repeats for about 3 pages worth and is all part of a url requested from my server and terminates with the same as above.

    This was in my error log:

    [Wed Mar 28 18:09:25 2007] [error] [client] mod_security: Access denied with code 406. Pattern match "^$" at HEADER("USER-AGENT") [severity "EMERGENCY"] [hostname "mechdaves.broadband.hostname.from.isp"] [uri "/_vti_bin/_vti_aut/fp30reg.dll"]
    [Wed Mar 28 18:09:26 2007] [error] [client] request failed: URI too long (longer than 8190)

    To me it seems like some sort of probe to find a weak windows machine (see the windows dll name). Any ideas?


  2. #2
    A quick google shows that those are IIS related exploits, so you may assume a warm smug feeling
    The second error log entry suggests that your web server has got that type of buffer overflow attempt covered. The first one is interesting as a pattern match of ^$ suggests a blank user agent - ie the program making the request does not even pretend to be any particular browser, which apparently your web server protects against.

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