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Ruby WEBrick::HTTP::DefaultFileHandler DoS

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Ruby WEBrick::HTTP::DefaultFileHandler DoS



The WEBrick::HTTP::DefaultFileHandler in WEBrick in Ruby 1.8.5 and earlier, 1.8.6 to 1.8.6-p286, 1.8.7 to 1.8.7-p71, and 1.9 to r18423 allows for a DoS (CPU consumption) via a crafted HTTP request.


  • kris katterjohn <katterjohn@gmail.com>


Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/dos/http/webrick_regex
msf auxiliary(webrick_regex) > show actions
msf auxiliary(webrick_regex) > set ACTION < action-name >
msf auxiliary(webrick_regex) > show options
    ...show and set options...
msf auxiliary(webrick_regex) > run 

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– Jim O’Gorman | President, Offensive Security