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Si no lo es, la tabla de concesi\u00f3n del propietario se comprueba para ver si existe una asignaci\u00f3n de concesi\u00f3n al dominio de llamada para la p\u00e1gina en cuesti\u00f3n. Sin embargo, la funci\u00f3n no comprueba si el dominio de propietario tiene una tabla de concesi\u00f3n o no. Algunos dominios especiales como `DOMID_XEN`, `DOMID_IO` y `DOMID_COW` se crean sin tablas de concesi\u00f3n. Por lo tanto, si __gnttab_cache_flush opera en una p\u00e1gina pose\u00edda por estos dominios especiales, intentar\u00e1 desreferenciar un puntero NULL en la estructura del dominio."}], "id": "CVE-2017-14318", "lastModified": "2024-11-21T03:12:32.837", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 4.9, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 2.0, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2017-09-12T15:29:00.300", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/100817"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039349"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-232.html"}, {"source": "cve@mitre.org", "url": "https://support.citrix.com/article/CTX227185"}, {"source": "cve@mitre.org", "url": "https://www.debian.org/security/2017/dsa-4050"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/100817"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039349"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-232.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://support.citrix.com/article/CTX227185"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.debian.org/security/2017/dsa-4050"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Matthew Daley for reporting this issue.", "bugzilla": {"description": "xen: Missing check for grant table (XSA-232)", "id": "1486708", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1486708"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "details": ["An issue was discovered in Xen 4.5.x through 4.9.x. The function `__gnttab_cache_flush` handles GNTTABOP_cache_flush grant table operations. It checks to see if the calling domain is the owner of the page that is to be operated on. If it is not, the owner's grant table is checked to see if a grant mapping to the calling domain exists for the page in question. However, the function does not check to see if the owning domain actually has a grant table or not. Some special domains, such as `DOMID_XEN`, `DOMID_IO` and `DOMID_COW` are created without grant tables. Hence, if __gnttab_cache_flush operates on a page owned by these special domains, it will attempt to dereference a NULL pointer in the domain struct."], "name": "CVE-2017-14318", "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": "2017-09-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-14318\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-14318\nhttp://xenbits.xen.org/xsa/advisory-232.html"], "threat_severity": "Important"}