CVE-2021-3418

{"id": "CVE-2021-3418", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.4, "accessVector": "LOCAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 3.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.4, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 0.5}]}, "published": "2021-03-15T22:15:13.907", "references": [{"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933757", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "secalert@redhat.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-281"}]}], "descriptions": [{"lang": "en", "value": "If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism."}, {"lang": "es", "value": "Si los certificados que firmaron grub est\u00e1n instalados en db, grub puede ser arrancado directamente. Entonces arrancar\u00e1 cualquier kernel sin comprobaci\u00f3n de firma. El kernel arrancado pensar\u00e1 que ha sido arrancado en modo secureboot e implementar\u00e1 el bloqueo, aunque podr\u00eda haber sido manipulado. Este fallo es una reintroducci\u00f3n de CVE-2020-15705 y s\u00f3lo afecta a las versiones de grbu2 anteriores a la 2.06 y a las distribuciones que usan el mecanismo shim_lock"}], "lastModified": "2021-03-22T16:45:49.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "01F8D62F-70BB-4718-A095-D68540C17EEA", "versionEndExcluding": "2.06"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}