Class: Arachni::Checks::AllowedMethods

Inherits:
Arachni::Check::Base show all
Defined in:
components/checks/passive/allowed_methods.rb

Overview

Allowed HTTP methods recon check.

Constant Summary

Constants included from Arachni::Check::Auditor

Arachni::Check::Auditor::DOM_ELEMENTS_WITH_INPUTS, Arachni::Check::Auditor::ELEMENTS_WITH_INPUTS, Arachni::Check::Auditor::FILE_SIGNATURES, Arachni::Check::Auditor::FILE_SIGNATURES_PER_PLATFORM, Arachni::Check::Auditor::Format, Arachni::Check::Auditor::SOURCE_CODE_SIGNATURES_PER_PLATFORM

Constants included from Arachni

BANNER, Arachni::Cookie, Form, Header, JSON, Link, LinkTemplate, NestedCookie, Severity, UIForm, UIInput, VERSION, WEBSITE, WIKI, XML

Instance Attribute Summary

Attributes included from Arachni::Check::Auditor

#framework, #page

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Arachni::Check::Base

#browser_cluster, elements, exempt_platforms, has_exempt_platforms?, has_platforms?, #initialize, platforms, #plugins, prefer, #preferred, preferred, #prepare, #session, supports_platforms?

Methods included from Arachni::Check::Auditor

#audit, #audit_differential, #audit_signature, #audit_timeout, #audited, #audited?, #buffered_audit, #each_candidate_dom_element, #each_candidate_element, has_timeout_candidates?, #http, #initialize, #log, #log_issue, #log_remote_file, #log_remote_file_if_exists, #match_and_log, #max_issues, #preferred, reset, #skip?, timeout_audit_run, #trace_taint, #with_browser, #with_browser_cluster

Methods inherited from Arachni::Component::Base

author, description, fullname, #shortname, shortname, shortname=, version

Methods included from Arachni::Component::Output

#depersonalize_output, #depersonalize_output?, #intercept_print_message

Methods included from UI::Output

#caller_location, #debug?, #debug_level, #debug_level_1?, #debug_level_2?, #debug_level_3?, #debug_level_4?, #debug_off, #debug_on, #disable_only_positives, #error_buffer, #error_log_fd, #error_logfile, #has_error_log?, #included, #log_error, #mute, #muted?, #only_positives, #only_positives?, #print_bad, #print_debug, #print_debug_backtrace, #print_debug_exception, #print_debug_level_1, #print_debug_level_2, #print_debug_level_3, #print_debug_level_4, #print_error, #print_error_backtrace, #print_exception, #print_info, #print_line, #print_ok, #print_status, #print_verbose, #reroute_to_file, #reroute_to_file?, reset_output_options, #set_error_logfile, #unmute, #verbose?, #verbose_off, #verbose_on

Methods included from Arachni::Component::Utilities

#read_file

Methods included from Utilities

#available_port, available_port_mutex, #bytes_to_kilobytes, #bytes_to_megabytes, #caller_name, #caller_path, #cookie_decode, #cookie_encode, #cookies_from_file, #cookies_from_parser, #cookies_from_response, #exception_jail, #exclude_path?, #follow_protocol?, #form_decode, #form_encode, #forms_from_parser, #forms_from_response, #full_and_absolute_url?, #generate_token, #get_path, #hms_to_seconds, #html_decode, #html_encode, #include_path?, #links_from_parser, #links_from_response, #normalize_url, #page_from_response, #page_from_url, #parse_set_cookie, #path_in_domain?, #path_too_deep?, #port_available?, #rand_port, #random_seed, #redundant_path?, #regexp_array_match, #remove_constants, #request_parse_body, #seconds_to_hms, #skip_page?, #skip_path?, #skip_resource?, #skip_response?, #to_absolute, #uri_decode, #uri_encode, #uri_parse, #uri_parse_query, #uri_parser, #uri_rewrite

Methods included from Arachni

URI, collect_young_objects, #get_long_win32_filename, jruby?, null_device, profile?, windows?

Constructor Details

This class inherits a constructor from Arachni::Check::Base

Class Method Details

.infoObject


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# File 'components/checks/passive/allowed_methods.rb', line 47

def self.info
    {
        name:        'Allowed methods',
        description: %q{Checks for supported HTTP methods.},
        elements:    [Element::Server],
        author:      'Tasos "Zapotek" Laskos <[email protected]>',
        version:     '0.2',

        issue:       {
            name:            %q{Allowed HTTP methods},
            description:     %q{
There are a number of HTTP methods that can be used on a webserver (`OPTIONS`,
`HEAD`, `GET`, `POST`, `PUT`, `DELETE` etc.).  Each of these methods perform a
different function and each have an associated level of risk when their use is
permitted on the webserver.

A client can use the `OPTIONS` method within a request to query a server to
determine which methods are allowed.

Cyber-criminals will almost always perform this simple test as it will give a
very quick indication of any high-risk methods being permitted by the server.

Arachni discovered that several methods are supported by the server.
},
            references:  {
                'Apache.org' => 'http://httpd.apache.org/docs/2.2/mod/core.html#limitexcept'
            },
            tags:            %w(http methods options),
            severity:        Severity::INFORMATIONAL,
            remedy_guidance: %q{
It is recommended that a whitelisting approach be taken to explicitly permit the
HTTP methods required by the application and block all others.

Typically the only HTTP methods required for most applications are `GET` and
`POST`. All other methods perform actions that are rarely required or perform
actions that are inherently risky.

These risky methods (such as `PUT`, `DELETE`, etc) should be protected by strict
limitations, such as ensuring that the channel is secure (SSL/TLS enabled) and
only authorised and trusted clients are permitted to use them.
}
        }
    }
end

.ranObject


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# File 'components/checks/passive/allowed_methods.rb', line 21

def self.ran
    @ran = true
end

.ran?Boolean

Returns:

  • (Boolean)

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# File 'components/checks/passive/allowed_methods.rb', line 17

def self.ran?
    !!@ran
end

Instance Method Details

#check_and_log(response) ⇒ Object


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# File 'components/checks/passive/allowed_methods.rb', line 36

def check_and_log( response )
    methods = response.headers['Allow']
    return if !methods || methods.empty?

    log vector: Element::Server.new( response.url ), proof: methods,
        response: response

    # inform the user that we have a match
    print_ok( methods )
end

#clean_upObject


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# File 'components/checks/passive/allowed_methods.rb', line 32

def clean_up
    self.class.ran
end

#runObject


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# File 'components/checks/passive/allowed_methods.rb', line 25

def run
    return if self.class.ran?

    print_status 'Checking...'
    http.request( page.url, method: :options ) { |response| check_and_log( response ) }
end