CVE-2021-28696 (GCVE-0-2021-28696)

Vulnerability from cvelistv5 – Published: 2021-08-27 18:46 – Updated: 2024-08-03 21:47
VLAI?
Summary
IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).
Severity ?
No CVSS data available.
CWE
  • unknown
Assigner
XEN
References
Impacted products
Vendor Product Version
Xen xen Affected: 4.11.x
Create a notification for this product.
Credits
{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Jan Beulich of SUSE.'}]}}}
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      "published": "2021-08-27T19:15:07.633",
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      "sourceIdentifier": "security@xen.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-863\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-28696\",\"sourceIdentifier\":\"security@xen.org\",\"published\":\"2021-08-27T19:15:07.633\",\"lastModified\":\"2024-11-21T06:00:09.800\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn\u0027t have access to anymore (CVE-2021-28696).\"},{\"lang\":\"es\",\"value\":\"Problemas de mapeo de p\u00e1ginas IOMMU en x86 [Este registro de inmaneraci\u00f3n CNA se relaciona con m\u00faltiples CVEs; el texto explica qu\u00e9 aspectos/vulnerabilidades corresponden a cada CVE]. Tanto AMD como Intel permiten que las tablas ACPI especifiquen las regiones de memoria que deben dejarse sin traducir, lo que normalmente significa que estas direcciones deben pasar la fase de traducci\u00f3n sin ser alteradas. Mientras que estas son t\u00edpicamente propiedades ACPI espec\u00edficas del dispositivo, tambi\u00e9n pueden ser especificadas para aplicarse a un rango de dispositivos, o incluso a todos los dispositivos. En todos los sistemas con tales regiones, Xen fall\u00f3 al evitar que los hu\u00e9spedes deshicieran/reemplazaran tales mapeos (CVE-2021-28694). En los sistemas AMD, donde un rango discontinuo es especificado por el firmware, el rango medio supuestamente excluido tambi\u00e9n ser\u00e1 mapeado por la identidad (CVE-2021-28695). Adem\u00e1s, en los sistemas AMD, al desasignar un dispositivo f\u00edsico de un hu\u00e9sped, los mapeos de identidad se dejar\u00edan en su lugar, permitiendo a un hu\u00e9sped el acceso continuo a rangos de memoria a los que ya no deber\u00eda tener acceso 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  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Detection rules are retrieved from Rulezet.