Vulnerability-Lookup

GHSA-CCQW-RPFW-2M25

Vulnerability from github – Published: 2021-11-22 00:00 – Updated: 2022-08-16 00:00

Details

certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table's address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-28710"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-11-21T15:15:00Z",
    "severity": "HIGH"
  },
  "details": "certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table\u0027s address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries.",
  "id": "GHSA-ccqw-rpfw-2m25",
  "modified": "2022-08-16T00:00:43Z",
  "published": "2021-11-22T00:00:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28710"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202208-23"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-390.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-28710 (GCVE-0-2021-28710)

Vulnerability from cvelistv5 – Published: 2021-11-21 14:18 – Updated: 2024-08-03 21:47

Summary

Severity

No CVSS data available.

CWE

unknown

Assigner

XEN mitre root

References

3 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-390.txt	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202208-23	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
Xen	xen	Unknown: unspecified , < 4.12 (custom) Affected: 4.15.x , < unspecified (custom) Unaffected: next of xen-unstable , < unspecified (custom)

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Jan Beulich of SUSE.'}]}}}

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JSON

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{
  "containers": {
    "adp": [
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          "dateUpdated": "2024-08-03T21:47:33.159Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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              "x_transferred"
            ],
            "url": "https://xenbits.xenproject.org/xsa/advisory-390.txt"
          },
          {
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            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
          },
          {
            "name": "GLSA-202208-23",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202208-23"
          }
        ],
        "title": "CVE Program Container"
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    "cna": {
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          "vendor": "Xen",
          "versions": [
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              "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "{\u0027credit_data\u0027: {\u0027description\u0027: {\u0027description_data\u0027: [{\u0027lang\u0027: \u0027eng\u0027, \u0027value\u0027: \u0027This issue was discovered by Jan Beulich of SUSE.\u0027}]}}}"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table\u0027s address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "description": {
                "description_data": [
                  {
                    "lang": "eng",
                    "value": "A malicious guest may be able to escalate its privileges to that of\nthe host."
                  }
                ]
              }
            },
            "type": "unknown"
          }
        }
      ],
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      "providerMetadata": {
        "dateUpdated": "2022-08-14T20:09:18.000Z",
        "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "shortName": "XEN"
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      "references": [
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          "url": "https://xenbits.xenproject.org/xsa/advisory-390.txt"
        },
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          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/"
        },
        {
          "name": "GLSA-202208-23",
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          "url": "https://security.gentoo.org/glsa/202208-23"
        }
      ],
      "x_legacyV4Record": {
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                      "version": {
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                            "version_affected": "?\u003c",
                            "version_value": "4.12"
                          },
                          {
                            "version_affected": "\u003e=",
                            "version_value": "4.15.x"
                          },
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                            "version_affected": "!\u003e",
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            }
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            },
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                  "value": "Suppressing the use of shared page tables avoids the vulnerability.\nThis can be achieved globally by passing \"iommu=no-sharept\" on the\nhypervisor command line.  This can also be achieved on a per-guest basis\nvia the \"passthrough=sync_pt\" xl guest configuration file option."
                }
              ]
            }
          }
        }
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.