{"containers": {"cna": {"affected": [{"product": "unspecified", "vendor": "unspecified", "versions": [{"status": "unknown", "version": "consult Xen advisory XSA-396"}]}], "credits": [{"lang": "en", "value": "{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Demi Marie Obenour and Simon Gaiser of\\nInvisible Things Lab.'}]}}}"}], "descriptions": [{"lang": "en", "value": "Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn't check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUG_ON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042"}], "metrics": [{"other": {"content": {"description": {"description_data": [{"lang": "eng", "value": "Due to race conditions and missing tests of return codes in the Linux\nPV device frontend drivers a malicious backend could gain access (read\nand write) to memory pages it shouldn't have, or it could directly\ntrigger Denial of Service (DoS) in the guest."}]}}, "type": "unknown"}}], "problemTypes": [{"descriptions": [{"description": "unknown", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2022-07-01T13:06:59", "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://xenbits.xenproject.org/xsa/advisory-396.txt"}, {"name": "[debian-lts-announce] 20220701 [SECURITY] [DLA 3065-1] linux security update", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@xen.org", "ID": "CVE-2022-23038", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "", "version": {"version_data": [{"version_affected": "?", "version_value": "consult Xen advisory XSA-396"}]}}]}, "vendor_name": ""}]}}, "configuration": {"configuration_data": {"description": {"description_data": [{"lang": "eng", "value": "All Linux guests using PV devices are vulnerable in case potentially\nmalicious PV device backends are being used."}]}}}, "credit": {"credit_data": {"description": {"description_data": [{"lang": "eng", "value": "This issue was discovered by Demi Marie Obenour and Simon Gaiser of\nInvisible Things Lab."}]}}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn't check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUG_ON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042"}]}, "impact": {"impact_data": {"description": {"description_data": [{"lang": "eng", "value": "Due to race conditions and missing tests of return codes in the Linux\nPV device frontend drivers a malicious backend could gain access (read\nand write) to memory pages it shouldn't have, or it could directly\ntrigger Denial of Service (DoS) in the guest."}]}}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "unknown"}]}]}, "references": {"reference_data": [{"name": "https://xenbits.xenproject.org/xsa/advisory-396.txt", "refsource": "MISC", "url": "https://xenbits.xenproject.org/xsa/advisory-396.txt"}, {"name": "[debian-lts-announce] 20220701 [SECURITY] [DLA 3065-1] linux security update", "refsource": "MLIST", "url": "https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html"}]}, "workaround": {"workaround_data": {"description": {"description_data": [{"lang": "eng", "value": "There is no mitigation available other than not using PV devices in case\na backend is suspected to be potentially malicious."}]}}}}}}, "cveMetadata": {"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "assignerShortName": "XEN", "cveId": "CVE-2022-23038", "datePublished": "2022-03-10T19:20:18", "dateReserved": "2022-01-10T00:00:00", "dateUpdated": "2022-07-01T13:06:59", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.0"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:xen:xen:-:*:*:*:*:*:*:*", "matchCriteriaId": "BFA1950D-1D9F-4401-AA86-CF3028EFD286", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "Linux PV device frontends vulnerable to attacks by backends T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Several Linux PV device frontends are using the grant table interfaces for removing access rights of the backends in ways being subject to race conditions, resulting in potential data leaks, data corruption by malicious backends, and denial of service triggered by malicious backends: blkfront, netfront, scsifront and the gntalloc driver are testing whether a grant reference is still in use. If this is not the case, they assume that a following removal of the granted access will always succeed, which is not true in case the backend has mapped the granted page between those two operations. As a result the backend can keep access to the memory page of the guest no matter how the page will be used after the frontend I/O has finished. The xenbus driver has a similar problem, as it doesn't check the success of removing the granted access of a shared ring buffer. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront, and pvcalls are using a functionality to delay freeing a grant reference until it is no longer in use, but the freeing of the related data page is not synchronized with dropping the granted access. As a result the backend can keep access to the memory page even after it has been freed and then re-used for a different purpose. CVE-2022-23041 netfront will fail a BUG_ON() assertion if it fails to revoke access in the rx path. This will result in a Denial of Service (DoS) situation of the guest which can be triggered by the backend. CVE-2022-23042"}, {"lang": "es", "value": "Los frontends de dispositivos Linux PV son vulnerables a ataques de backends [Este registro de informaci\u00f3n CNA se relaciona con m\u00faltiples CVEs; el texto explica qu\u00e9 aspectos/vulnerabilidades corresponden a cada CVE]. Varios frontends de dispositivos Linux PV est\u00e1n usando las interfaces de la tabla de concesi\u00f3n para eliminar los derechos de acceso de los backends de forma que est\u00e1n sujetos a condiciones de carrera, resultando en posibles filtrados de datos, corrupci\u00f3n de datos por parte de backends maliciosos y denegaci\u00f3n de servicio desencadenada por backends maliciosos: blkfront, netfront, scsifront y el controlador gntalloc est\u00e1n comprobando si una referencia de concesi\u00f3n est\u00e1 todav\u00eda en uso. Si no es el caso, asumen que una siguiente eliminaci\u00f3n del acceso concedido siempre tendr\u00e1 \u00e9xito, lo que no es cierto en caso de que el backend haya mapeado la p\u00e1gina concedida entre esas dos operaciones. Como resultado, el backend puede mantener el acceso a la p\u00e1gina de memoria del hu\u00e9sped sin importar c\u00f3mo ser\u00e1 usada la p\u00e1gina despu\u00e9s de que la E/S del frontend haya terminado. El controlador xenbus presenta un problema similar, ya que no comprueba el \u00e9xito de la eliminaci\u00f3n del acceso concedido de un buffer de anillo compartido. blkfront: CVE-2022-23036 netfront: CVE-2022-23037 scsifront: CVE-2022-23038 gntalloc: CVE-2022-23039 xenbus: CVE-2022-23040 blkfront, netfront, scsifront, usbfront, dmabuf, xenbus, 9p, kbdfront y pvcalls usan una funcionalidad para retrasar la liberaci\u00f3n de una referencia de concesi\u00f3n hasta que ya no est\u00e9 usada, pero la liberaci\u00f3n de la p\u00e1gina de datos relacionada no est\u00e1 sincronizada con la ca\u00edda del acceso concedido. Como resultado, el backend puede mantener el acceso a la p\u00e1gina de memoria incluso despu\u00e9s de que haya sido liberada y reusada para un prop\u00f3sito diferente. CVE-2022-23041 netfront fallar\u00e1 una aserci\u00f3n BUG_ON() si no consigue revocar el acceso en la ruta rx. Esto resultar\u00e1 en una situaci\u00f3n de Denegaci\u00f3n de Servicio (DoS) del hu\u00e9sped que puede ser desencadenada por el backend. CVE-2022-23042"}], "id": "CVE-2022-23038", "lastModified": "2022-11-29T02:32:06.110", "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": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-03-10T20:15:08.593", "references": [{"source": "security@xen.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html"}, {"source": "security@xen.org", "tags": ["Third Party Advisory"], "url": "https://xenbits.xenproject.org/xsa/advisory-396.txt"}], "sourceIdentifier": "security@xen.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}