{"containers": {"cna": {"affected": [{"product": "xen", "vendor": "Xen", "versions": [{"lessThan": "4.12", "status": "unknown", "version": "unspecified", "versionType": "custom"}, {"lessThan": "unspecified", "status": "affected", "version": "4.15.x", "versionType": "custom"}, {"lessThan": "unspecified", "status": "unaffected", "version": "next of xen-unstable", "versionType": "custom"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"status": "affected", "version": "4.11.x"}]}, {"product": "xen", "vendor": "Xen", "versions": [{"lessThan": "4.12", "status": "unknown", "version": "unspecified", "versionType": "custom"}, {"lessThan": "unspecified", "status": "affected", "version": "4.12.x", "versionType": "custom"}, {"lessThan": "unspecified", "status": "unaffected", "version": "next of 4.14.x", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Julien Grall of Amazon.'}]}}}"}], "descriptions": [{"lang": "en", "value": "Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. 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Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed."}], "metrics": [{"other": {"content": {"description": {"description_data": [{"lang": "eng", "value": "A malicious guest may be able to elevate its privileges to that of the\nhost, cause host or guest Denial of Service (DoS), or cause information\nleaks."}]}}, "type": "unknown"}}], "problemTypes": [{"descriptions": [{"description": "unknown", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2022-08-14T20:11:46.000Z", "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"}, {"tags": ["x_refsource_CONFIRM"], "url": "http://xenbits.xen.org/xsa/advisory-384.html"}, {"name": "[oss-security] 20210908 Xen Security Advisory 384 v3 (CVE-2021-28701) - Another race in XENMAPSPACE_grant_table handling", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"}, {"name": "FEDORA-2021-11577e5229", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/"}, {"name": "FEDORA-2021-fed53cbc7d", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/"}, {"name": "DSA-4977", "tags": ["vendor-advisory", "x_refsource_DEBIAN"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-5a0c7bc619", "tags": ["vendor-advisory", "x_refsource_FEDORA"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/"}, {"name": "GLSA-202208-23", "tags": ["vendor-advisory", "x_refsource_GENTOO"], "url": "https://security.gentoo.org/glsa/202208-23"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@xen.org", "ID": "CVE-2021-28701", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "xen", "version": {"version_data": [{"version_affected": "?<", "version_value": "4.12"}, {"version_affected": ">=", "version_value": "4.15.x"}, {"version_affected": "!>", "version_value": "xen-unstable"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_value": "4.11.x"}]}}, {"product_name": "xen", "version": {"version_data": [{"version_affected": "?<", "version_value": "4.12"}, {"version_affected": ">=", "version_value": "4.12.x"}, {"version_affected": "!>", "version_value": "4.14.x"}]}}]}, "vendor_name": "Xen"}]}}, "configuration": {"configuration_data": {"description": {"description_data": [{"lang": "eng", "value": "All Xen versions from 4.0 onwards are affected. 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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."}]}, "impact": {"impact_data": {"description": {"description_data": [{"lang": "eng", "value": "A malicious guest may be able to elevate its privileges to that of the\nhost, cause host or guest Denial of Service (DoS), or cause information\nleaks."}]}}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "unknown"}]}]}, "references": {"reference_data": [{"name": "https://xenbits.xenproject.org/xsa/advisory-384.txt", "refsource": "MISC", "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"}, {"name": "http://xenbits.xen.org/xsa/advisory-384.html", "refsource": "CONFIRM", "url": "http://xenbits.xen.org/xsa/advisory-384.html"}, {"name": "[oss-security] 20210908 Xen Security Advisory 384 v3 (CVE-2021-28701) - Another race in XENMAPSPACE_grant_table handling", "refsource": "MLIST", "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"}, {"name": "FEDORA-2021-11577e5229", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/"}, {"name": "FEDORA-2021-fed53cbc7d", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/"}, {"name": "DSA-4977", "refsource": "DEBIAN", "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-5a0c7bc619", "refsource": "FEDORA", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/"}, {"name": "GLSA-202208-23", "refsource": "GENTOO", "url": "https://security.gentoo.org/glsa/202208-23"}]}, "workaround": {"workaround_data": {"description": {"description_data": [{"lang": "eng", "value": "Running only PV guests will avoid this vulnerability.\n\nSuppressing use of grant table v2 interfaces for HVM or PVH guests will\nalso avoid this vulnerability."}]}}}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T21:47:33.200Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "http://xenbits.xen.org/xsa/advisory-384.html"}, {"name": "[oss-security] 20210908 Xen Security Advisory 384 v3 (CVE-2021-28701) - Another race in XENMAPSPACE_grant_table handling", "tags": ["mailing-list", "x_refsource_MLIST", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"}, {"name": "FEDORA-2021-11577e5229", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/"}, {"name": "FEDORA-2021-fed53cbc7d", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/"}, {"name": "DSA-4977", "tags": ["vendor-advisory", "x_refsource_DEBIAN", "x_transferred"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"name": "FEDORA-2021-5a0c7bc619", "tags": ["vendor-advisory", "x_refsource_FEDORA", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/"}, {"name": "GLSA-202208-23", "tags": ["vendor-advisory", "x_refsource_GENTOO", "x_transferred"], "url": "https://security.gentoo.org/glsa/202208-23"}]}]}, "cveMetadata": {"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "assignerShortName": "XEN", "cveId": "CVE-2021-28701", "datePublished": "2021-09-08T13:02:28.000Z", "dateReserved": "2021-03-18T00:00:00.000Z", "dateUpdated": "2024-08-03T21:47:33.200Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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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"}], "id": "CVE-2021-28701", "lastModified": "2024-11-21T06:00:10.450", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.4, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.1, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-09-08T14:15:08.547", "references": [{"source": "security@xen.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"}, {"source": "security@xen.org", "tags": ["Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-384.html"}, {"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", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-23"}, {"source": "security@xen.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"source": "security@xen.org", "tags": ["Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "http://xenbits.xen.org/xsa/advisory-384.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-23"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-4977"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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