CVE-2025-34090

{"id": "CVE-2025-34090", "cveTags": [], "metrics": {"cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.3, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2025-07-02T20:15:30.110", "references": [{"url": "https://vulncheck.com/advisories/google-chrome-appbound-cookie-encryption", "source": "disclosure@vulncheck.com"}, {"url": "https://www.cyberark.com/resources/threat-research-blog/c4-bomb-blowing-up-chromes-appbound-cookie-encryption", "source": "disclosure@vulncheck.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-276"}, {"lang": "en", "value": "CWE-426"}]}], "descriptions": [{"lang": "en", "value": "A security bypass vulnerability exists in Google Chrome AppBound cookie encryption mechanism due to insufficient validation of COM server paths during inter-process communication. A local low-privileged attacker can hijack the COM class identifier (CLSID) registration used by Chrome's elevation service and point it to a non-existent or malicious binary. When this hijack occurs, Chrome silently falls back to the legacy cookie encryption mechanism (protected only by user-DPAPI), thereby enabling cookie decryption by any user-context malware without SYSTEM-level access. This flaw bypasses the protections intended by the AppBound encryption design and allows cookie theft from Chromium-based browsers.\n\nConfirmed in Google Chrome with AppBound Encryption enabled. Other Chromium-based browsers may be affected if they implement similar COM-based encryption mechanisms."}, {"lang": "es", "value": "Existe una vulnerabilidad de omisi\u00f3n de seguridad en el mecanismo de cifrado de cookies de Google Chrome AppBound debido a una validaci\u00f3n insuficiente de las rutas del servidor COM durante la comunicaci\u00f3n entre procesos. Un atacante local con privilegios bajos puede secuestrar el registro del identificador de clase COM (CLSID) utilizado por el servicio de elevaci\u00f3n de Chrome y dirigirlo a un binario inexistente o malicioso. Cuando se produce este secuestro, Chrome recurre silenciosamente al mecanismo de cifrado de cookies heredado (protegido \u00fanicamente por la DPAPI del usuario), lo que permite que cualquier malware de contexto de usuario descifre las cookies sin acceso a nivel de sistema. Esta falla elude las protecciones previstas por el dise\u00f1o de cifrado de AppBound y permite el robo de cookies de navegadores basados en Chromium. Confirmado en Google Chrome con el cifrado de AppBound habilitado. Otros navegadores basados en Chromium podr\u00edan verse afectados si implementan mecanismos de cifrado basados en COM similares."}], "lastModified": "2025-07-03T15:13:53.147", "sourceIdentifier": "disclosure@vulncheck.com"}