github - ghsa-j6wm-c7q8-jcx7

GHSA-J6WM-C7Q8-JCX7

Vulnerability from github – Published: 2022-05-24 17:44 – Updated: 2022-05-24 17:44

Details

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grbu2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-3418"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-281"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-03-15T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grbu2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.",
  "id": "GHSA-j6wm-c7q8-jcx7",
  "modified": "2022-05-24T17:44:39Z",
  "published": "2022-05-24T17:44:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3418"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933757"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2021-3418 (GCVE-0-2021-3418)

Vulnerability from cvelistv5 – Published: 2021-03-15 21:17 – Updated: 2024-08-03 16:53

Summary

If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

Severity ?

No CVSS data available.

CWE

CWE-281

Assigner

redhat

References

URL

Tags

https://bugzilla.redhat.com/show_bug.cgi?id=1933757

x_refsource_MISC

Impacted products

	Vendor	Product	Version
	n/a	grub2	Affected: Fixed in 2.06

Show details on NVD website

JSON

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          "dateUpdated": "2024-08-03T16:53:17.504Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933757"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grub2",
          "vendor": "n/a",
          "versions": [
            {
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              "version": "Fixed in 2.06"
            }
          ]
        }
      ],
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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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      ],
      "providerMetadata": {
        "dateUpdated": "2021-03-18T14:44:25",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933757"
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      ],
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          "ASSIGNER": "secalert@redhat.com",
          "ID": "CVE-2021-3418",
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        },
        "affects": {
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            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
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                      "version": {
                        "version_data": [
                          {
                            "version_value": "Fixed in 2.06"
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                },
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  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-J6WM-C7Q8-JCX7

CVE-2021-3418 (GCVE-0-2021-3418)

Tags

Sightings

Nomenclature