CVE-2021-28701

{"id": "CVE-2021-28701", "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": "CHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.1}]}, "published": "2021-09-08T14:15:08.547", "references": [{"url": "http://www.openwall.com/lists/oss-security/2021/09/08/2", "tags": ["Mailing List", "Third Party Advisory"], "source": "security@xen.org"}, {"url": "http://xenbits.xen.org/xsa/advisory-384.html", "tags": ["Vendor Advisory"], "source": "security@xen.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/", "source": "security@xen.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/", "source": "security@xen.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/", "source": "security@xen.org"}, {"url": "https://security.gentoo.org/glsa/202208-23", "tags": ["Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://www.debian.org/security/2021/dsa-4977", "tags": ["Third Party Advisory"], "source": "security@xen.org"}, {"url": "https://xenbits.xenproject.org/xsa/advisory-384.txt", "tags": ["Vendor Advisory"], "source": "security@xen.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed."}, {"lang": "es", "value": "Otra carrera en el manejo de la funci\u00f3n XENMAPSPACE_grant_table de los Hu\u00e9spedes, se les permite el acceso a determinadas p\u00e1ginas de memoria propiedad de Xen. La mayor\u00eda de estas p\u00e1ginas permanecen asignadas / asociadas a un hu\u00e9sped durante toda su vida. Las p\u00e1ginas de estado de la tabla Grant v2, sin embargo, se desasignan cuando un hu\u00e9sped cambia (de nuevo) de v2 a v1. Una liberaci\u00f3n de dichas p\u00e1ginas requiere que el hipervisor haga cumplir que ninguna petici\u00f3n paralela pueda resultar en la adici\u00f3n de un mapeo de dicha p\u00e1gina a un hu\u00e9sped. Esta aplicaci\u00f3n no exist\u00eda, permitiendo a los hu\u00e9spedes mantener el acceso a las p\u00e1ginas liberadas y quiz\u00e1s reusarlas para otros fines. Desafortunadamente, cuando fue preparada la XSA-379, no se advirti\u00f3 este problema similar"}], "lastModified": "2023-11-07T03:32:19.887", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3E095C1C-0DC6-4380-9333-477B13273E9E", "versionStartIncluding": "4.0.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"}], "operator": "OR"}]}], "sourceIdentifier": "security@xen.org"}