CVE-2018-15468

{"id": "CVE-2018-15468", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.9, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 6.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 6.0, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 1.5}]}, "published": "2018-08-17T18:29:00.740", "references": [{"url": "http://xenbits.xen.org/xsa/advisory-269.html", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://security.gentoo.org/glsa/201810-06", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service."}, {"lang": "es", "value": "Se ha descubierto un problema en Xen hasta las versiones 4.11.x. DUBGCTL MSR contiene varias caracter\u00edsticas de depuraci\u00f3n, de las cuales algunas virtualizan limpiamente, pero otras no. En particular, Bnach Trace Store no lo virtualiza el procesador y el software tiene que configurarse con cuidado para no bloquear el n\u00facleo. Como resultado, solo debe estar disponible para guests de total confianza. Desafortunadamente, en el caso de que vPMU est\u00e9 deshabilitado, se omiti\u00f3 toda comprobaci\u00f3n de valores, permitiendo al guest elegir cualquier configuraci\u00f3n MSR_DEBUGCTL que desee. Un administrador guest malicioso o con errores (en Intel x86 HVM o PVH) puede bloquear todo el host, provocando una denegaci\u00f3n de servicio."}], "lastModified": "2019-10-03T00:03:26.223", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CDF60B9D-F0FE-401D-9864-7A70BE5631DD", "versionEndIncluding": "4.11.0"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}