Class: Arachni::Checks::BackupDirectories

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

Overview

Author:

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

.formatsObject


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# File 'components/checks/passive/backup_directories.rb', line 12

def self.formats
    @formats ||= read_file( 'formats.txt' )
end

.infoObject


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# File 'components/checks/passive/backup_directories.rb', line 49

def self.info
    {
        name:             'Backup directories',
        description:      %q{Tries to find backed-up directories.},
        elements:         [ Element::Server ],
        author:           'Tasos "Zapotek" Laskos <[email protected]> ',
        version:          '0.1.3',
        exempt_platforms: Arachni::Platform::Manager::FRAMEWORKS,

        issue:       {
            name:            %q{Backup directory},
            description:     %q{
A common practice when administering web applications is to create a copy/backup
of a particular directory prior to making any modification.
Another common practice is to add an extension or change the name of the original
directory to signify that it is a backup (examples include `.bak`, `.orig`, `.backup`,
etc.).

During the initial recon stages of an attack, cyber-criminals will attempt to
locate backup directories by adding common extensions onto directories already
discovered on the webserver. By analysing the response headers from the server
they are able to determine if a backup directory exists.
These backup directories can then assist in the compromise of the web application.

By utilising the same method, Arachni was able to discover a possible backup directory.
},
            references: {
                'WebAppSec' => 'http://www.webappsec.org/projects/threat/classes/information_leakage.shtml'
            },
            tags:            %w(path backup file discovery),
            cwe:             530,
            severity:        Severity::MEDIUM,
            remedy_guidance: %q{
Do not keep obsolete versions of directories under the virtual web server root.

When updating the site, delete or move the directories to a directory outside the
virtual root, edit them there, and move (or copy) the directories back to the virtual
root.
Make sure that only the directories that are actually in use reside under the virtual root.

Preventing access without authentication may also be an option and stop a client
being able to view the contents of a directory6, however it is still likely that the
filenames will be able to be discovered.

Using obscure filenames is only implementing security through obscurity and is
not a recommended option.
}
        }
    }
end

Instance Method Details

#runObject


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# File 'components/checks/passive/backup_directories.rb', line 16

def run
    return if page.code != 200

    if page.parsed_url.path.to_s.empty? || page.parsed_url.path == '/'
        print_info "Backing out, couldn't extract directory name from: #{page.url}"
        return
    end

    resource = page.parsed_url.without_query
    return if audited?( resource )

    path = "#{File.dirname( resource )}/"
    name = File.basename( page.parsed_url.path )

    self.class.formats.each do |format|
        backup_name = format.gsub( '[name]', name )
        url = path + backup_name

        remark = 'Identified by converting the original directory name of ' <<
            "'#{name}' to '#{backup_name}' using format '#{format}'."

        log_remote_file_if_exists(
            url,
            false,
            remarks: {
                check: [ remark ]
            }
        )
    end

    audited( resource )
end