Class: Arachni::Checks::CodeInjection

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

Overview

It's designed to work with PHP, Perl, Python, Java, ASP and Ruby but still needs some more testing.

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, 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

.code_stringsObject


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# File 'components/checks/active/code_injection.rb', line 38

def self.code_strings
    # code strings to be injected to the webapp
    @code_strings ||= {
        php:    "print #{rand1}*#{rand2};",
        perl:   "print #{rand1}*#{rand2};",
        python: "print #{rand1}*#{rand2}",
        asp:    "Response.Write\x28#{rand1}*#{rand2}\x29"
    }
end

.infoObject


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# File 'components/checks/active/code_injection.rb', line 63

def self.info
    {
        name:        'Code injection',
        description: %q{
Injects code snippets and assess whether or not execution was successful.
},
        elements:    ELEMENTS_WITH_INPUTS,
        author:      'Tasos "Zapotek" Laskos <[email protected]>',
        version:     '0.2.5',
        platforms:   payloads.keys,

        issue:       {
            name:            %q{Code injection},
            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.

Arachni was able to inject specific server-side code and have the executed output
from the code contained within the server response. 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/',
            },
            tags:            %w(code injection regexp),
            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

.optionsObject


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# File 'components/checks/active/code_injection.rb', line 31

def self.options
    @options ||= {
        signatures: (rand1.to_i * rand2.to_i).to_s,
        format:     [Format::STRAIGHT]
    }
end

.payloadsObject


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# File 'components/checks/active/code_injection.rb', line 48

def self.payloads
    return @payloads if @payloads

    @payloads = {}
    code_strings.each do |platform, payload|
        @payloads[platform] = [ ';%s', "\";%s#", "';%s#" ].
            map { |var| var % payload } | [payload]
    end
    @payloads
end

.rand1Object


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# File 'components/checks/active/code_injection.rb', line 23

def self.rand1
    @rand1 ||= '28763'
end

.rand2Object


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# File 'components/checks/active/code_injection.rb', line 27

def self.rand2
    @rand2 ||= '4196403'
end

Instance Method Details

#runObject


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# File 'components/checks/active/code_injection.rb', line 59

def run
    audit( self.class.payloads, self.class.options )
end