cve-2022-23042
Vulnerability from cvelistv5
Published
2022-03-10 19:20
Modified
2024-08-03 03:28
Severity ?
Summary
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
References
security@xen.orghttps://lists.debian.org/debian-lts-announce/2022/07/msg00000.htmlMailing List, Third Party Advisory
security@xen.orghttps://xenbits.xenproject.org/xsa/advisory-396.txtThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/07/msg00000.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://xenbits.xenproject.org/xsa/advisory-396.txtThird Party Advisory
Impacted products
Vendor Product Version
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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. 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Esto resultar\u00e1 en una situaci\u00f3n de Denegaci\u00f3n de Servicio (DoS) del hu\u00e9sped que puede ser desencadenada por el backend. 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