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add security coockies back into PE loader for kernel driver #1063

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Merged
xwings merged 1 commit into from
Jan 10, 2022
Merged

add security coockies back into PE loader for kernel driver #1063

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2 changes: 1 addition & 1 deletion examples/rootfs
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Submodule rootfs updated from 3a1e33 to 999e50
17 changes: 16 additions & 1 deletion qiling/loader/pe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
# Cross Platform and Multi Architecture Advanced Binary Emulation Framework
#

import os, pefile, pickle, traceback
import os, pefile, pickle, secrets, traceback
from typing import Any, MutableMapping, Optional, Mapping, Sequence

from qiling import Qiling
Expand Down Expand Up @@ -608,6 +608,21 @@ def load(self):
self.pe.parse_data_directories()
data = bytearray(self.pe.get_memory_mapped_image())
self.ql.mem.write(self.pe_image_address, bytes(data))

if self.is_driver:
# setup IMAGE_LOAD_CONFIG_DIRECTORY
if self.pe.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG']].VirtualAddress != 0:
SecurityCookie_rva = self.pe.DIRECTORY_ENTRY_LOAD_CONFIG.struct.SecurityCookie - self.pe.OPTIONAL_HEADER.ImageBase
SecurityCookie_value = default_security_cookie_value = self.ql.mem.read(self.pe_image_address+SecurityCookie_rva, self.ql.pointersize)
while SecurityCookie_value == default_security_cookie_value:
SecurityCookie_value = secrets.token_bytes(self.ql.pointersize)
# rol rcx, 10h (rcx: cookie)
# test cx, 0FFFFh
SecurityCookie_value_array = bytearray(SecurityCookie_value)
# Sanity question: We are always little endian, right?
SecurityCookie_value_array[-2:] = b'\x00\x00'
SecurityCookie_value = bytes(SecurityCookie_value_array)
self.ql.mem.write(self.pe_image_address+SecurityCookie_rva, SecurityCookie_value)

# Add main PE to ldr_data_table
mod_name = os.path.basename(self.path)
Expand Down