Vulnerability-Lookup

GHSA-423X-F92F-R5FM

Vulnerability from github – Published: 2022-05-24 19:13 – Updated: 2022-07-13 00:01

Details

Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. 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.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-28701"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-09-08T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "Another race in XENMAPSPACE_grant_table handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. 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.",
  "id": "GHSA-423x-f92f-r5fm",
  "modified": "2022-07-13T00:01:15Z",
  "published": "2022-05-24T19:13:51Z",
  "references": [
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28701"
    },
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C"
    },
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    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202208-23"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2021/dsa-4977"
    },
    {
      "type": "WEB",
      "url": "https://xenbits.xenproject.org/xsa/advisory-384.txt"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2021/09/08/2"
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      "type": "WEB",
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  "severity": [
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      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-28701 (GCVE-0-2021-28701)

Vulnerability from cvelistv5 – Published: 2021-09-08 13:02 – Updated: 2024-08-03 21:47

Summary

Severity

No CVSS data available.

CWE

unknown

Assigner

XEN mitre root Scorecard

References

8 references

URL	Tags
https://xenbits.xenproject.org/xsa/advisory-384.txt	x_refsource_MISC
http://xenbits.xen.org/xsa/advisory-384.html	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2021/09/08/2	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2021/dsa-4977	vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202208-23	vendor-advisoryx_refsource_GENTOO

Impacted products

3 products

Vendor	Product	Version
Xen	xen	Unknown: unspecified , < 4.12 (custom) Affected: 4.15.x , < unspecified (custom) Unaffected: next of xen-unstable , < unspecified (custom)
Xen	xen	Affected: 4.11.x
Xen	xen	Unknown: unspecified , < 4.12 (custom) Affected: 4.12.x , < unspecified (custom) Unaffected: next of 4.14.x , < unspecified (custom)

Credits

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Julien Grall of Amazon.'}]}}}

Show details on NVD website

JSON

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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.

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.

Action not permitted

GHSA-423X-F92F-R5FM

CVE-2021-28701 (GCVE-0-2021-28701)

Tags

Sightings

Nomenclature

Related by attack behaviour