Class: Arachni::Checks::CodeInjectionTiming

Inherits:
Arachni::Check::Base show all
Defined in:
components/checks/active/code_injection_timing.rb

Overview

Tries to inject code strings which, if executed, will cause an identifiable delay in execution.

If that delay can be verified then the vector via which it was introduced is flagged as vulnerable.

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, #clean_up, 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/active/code_injection_timing.rb', line 47

def self.info
    {
        name:        'Code injection (timing)',
        description: %q{
Injects code snippets and assess whether or not the injection was successful using
a time delay.
},
        elements:    ELEMENTS_WITH_INPUTS,
        author:      'Tasos "Zapotek" Laskos <[email protected]>',
        version:     '0.3.2',
        platforms:   payloads.keys,

        issue:       {
            name:            %q{Code injection (timing attack)},
            description:     %q{
A modern web application will be reliant on several different programming languages.

These languages can be broken up in two flavours. These are client-side languages
(such as those that run in the browser -- like JavaScript) and server-side
languages (which are executed by the server -- like ASP, PHP, JSP, etc.) to form
the dynamic pages (client-side code) that are then sent to the client.

Because all server-side code should be executed by the server, it should only ever
come from a trusted source.

Code injection occurs when the server takes untrusted code (ie. from the client)
and executes it.

Cyber-criminals will abuse this weakness to execute arbitrary code on the server,
which could result in complete server compromise.

By injecting server-side code that is known to take a specific amount of time to
execute, Arachni was able to detect time-based code injection. This indicates that
proper input sanitisation is not occurring.
},
            references:  {
                'PHP'    => 'http://php.net/manual/en/function.eval.php',
                'Perl'   => 'http://perldoc.perl.org/functions/eval.html',
                'Python' => 'http://docs.python.org/py3k/library/functions.html#eval',
                'ASP'    => 'http://www.aspdev.org/asp/asp-eval-execute/',
                'Ruby'   => 'http://en.wikipedia.org/wiki/Eval#Ruby'
            },
            tags:            %w(code injection timing blind),
            cwe:             94,
            severity:        Severity::HIGH,
            remedy_guidance: %q{
It is recommended that untrusted input is never processed as server-side code.

To validate input, the application should ensure that the supplied value contains
only the data that are required to perform the relevant action.

For example, where a username is required, then no non-alpha characters should not
be accepted.
}
        }
    }
end

.payloadsObject


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# File 'components/checks/active/code_injection_timing.rb', line 29

def self.payloads
    @payloads ||= {
        ruby:   'sleep(__TIME__/1000);',
        php:    'sleep(__TIME__/1000);',
        perl:   'sleep(__TIME__/1000);',
        python: 'import time;time.sleep(__TIME__/1000);',
        java:   'Thread.sleep(__TIME__);',
        asp:    'Thread.Sleep(__TIME__);',
    }.inject({}) do |h, (platform, payload)|
        h[platform] = [ ' %s', ';%s', "\";%s#", "';%s#" ].map { |s| s % payload }
        h
    end
end

Instance Method Details

#runObject


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# File 'components/checks/active/code_injection_timing.rb', line 43

def run
    audit_timeout( self.class.payloads, format: [Format::STRAIGHT], timeout: 4000 )
end