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Bajo algunas circunstancias, Xen limpiar\u00e1 los bits de estado demasiado pronto, informando al invitado de forma incorrecta que la sentencia grant ya no se est\u00e1 utilizando. Un invitado podr\u00eda creer prematuramente que un marco de concesi\u00f3n vuelve a ser privado de forma segura y reutilizarlo de forma que contenga informaci\u00f3n sensible, mientras que el dominio en el extremo de la sentencia grant sigue utiliz\u00e1ndola. Xen 4.9, 4.8, 4.7, 4.6, y 4.5 se han visto afectadas."}], "id": "CVE-2017-12855", "lastModified": "2017-11-15T02:29:08.703", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.1, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.0, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2017-08-15T16:29:00.233", "references": [{"source": "cve@mitre.org", "url": "http://www.debian.org/security/2017/dsa-3969"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/100341"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039177"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-230.html"}, {"source": "cve@mitre.org", "url": "https://support.citrix.com/article/CTX225941"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Jan Beulich (SUSE) as the original reporter.", "bugzilla": {"description": "xen: grant_table: possibly premature clearing of GTF_writing / GTF_reading (XSA-230)", "id": "1481762", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1481762"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "details": ["Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected."], "name": "CVE-2017-12855", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2017-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-12855\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-12855\nhttp://xenbits.xen.org/xsa/advisory-230.html"], "threat_severity": "Moderate"}