Class: Arachni::Checks::OsCmdInjectionTiming

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

Overview

OS command injection check using timing attacks.

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

.infoObject


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# File 'components/checks/active/os_cmd_injection_timing.rb', line 46

def self.info
    {
        name:        'OS command injection (timing)',
        description: %q{
Tries to find operating system command injections using timing attacks.
},
        elements:    ELEMENTS_WITH_INPUTS,
        author:      'Tasos "Zapotek" Laskos <[email protected]> ',
        version:     '0.3.2',
        platforms:   payloads.keys,

        issue:       {
            name:            %q{Operating system command injection (timing attack)},
            description:     %q{
To perform specific actions from within a web application, it is occasionally
required to run Operating System commands and have the output of these commands
captured by the web application and returned to the client.

OS command injection occurs when user supplied input is inserted into one of these
commands without proper sanitisation and is then executed by the server.

Cyber-criminals will abuse this weakness to perform their own arbitrary commands
on the server. This can include everything from simple `ping` commands to map the
internal network, to obtaining full control of the server.

By injecting OS commands that take a specific amount of time to execute, Arachni
was able to detect time based OS command injection. This indicates that proper
input sanitisation is not occurring.
},
            references:  {
                'OWASP' => 'https://www.owasp.org/index.php/OS_Command_Injection'
            },
            tags:            %w(os command code injection timing blind),
            cwe:             78,
            severity:        Severity::HIGH,
            remedy_guidance: %q{
It is recommended that untrusted data is never used to form a command to be
executed by the OS.

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

For example, where the form field expects an IP address, only numbers and periods
should be accepted. Additionally, all control operators (`&`, `&&`, `|`, `||`,
`$`, `\`, `#`) should be explicitly denied and never accepted as valid input by
the server.
}
        }
    }
end

.payloadsObject


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# File 'components/checks/active/os_cmd_injection_timing.rb', line 20

def self.payloads
    @payloads ||= {
        unix:    'sleep __TIME__',
        windows: 'ping -n __TIME__ localhost'
    }.inject({}) do |h, (platform, payload)|
        h[platform] ||= []
        h[platform] << "#{payload}"

        ['', '\'', '"'].each do |q|
            h[platform] |= [ '&', '&&', '|', ';' ].
                map { |sep| "#{q} #{sep} #{payload} #{sep} #{q}" }
        end

        h[platform] << "` #{payload}`"
        h
    end
end

Instance Method Details

#runObject


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

def run
    audit_timeout self.class.payloads,
                   format:          [Format::STRAIGHT],
                   timeout:         4000,
                   timeout_divider: 1000,
                   add:             -1000
end