Vulnerability-Lookup

OESA-2022-1597 (CVE-2021-3981)

Vulnerability from osv_openeuler – Published: 2022-03-26 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

grub2 security update

Details

GNU GRUB is a Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn.

Security Fix(es):

A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.(CVE-2021-3981)

Severity

5.3 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3981	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "grub2-efi-aa64-cdboot-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-2.04-23.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-23.oe1.aarch64.rpm",
          "grub2-efi-aa64-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-23.oe1.aarch64.rpm",
          "grub2-debuginfo-2.04-23.oe1.aarch64.rpm"
        ],
        "noarch": [
          "grub2-efi-x64-modules-2.04-23.oe1.noarch.rpm",
          "grub2-help-2.04-23.oe1.noarch.rpm",
          "grub2-common-2.04-23.oe1.noarch.rpm",
          "grub2-efi-ia32-modules-2.04-23.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-23.oe1.noarch.rpm",
          "grub2-efi-aa64-modules-2.04-23.oe1.noarch.rpm"
        ],
        "src": [
          "grub2-2.04-23.oe1.src.rpm"
        ],
        "x86_64": [
          "grub2-efi-x64-2.04-23.oe1.x86_64.rpm",
          "grub2-pc-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-extra-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-ia32-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-2.04-23.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-23.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-23.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "grub2",
        "purl": "pkg:rpm/openEuler/grub2\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-23.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "grub2-efi-aa64-2.04-23.oe1.aarch64.rpm",
          "grub2-debuginfo-2.04-23.oe1.aarch64.rpm",
          "grub2-efi-aa64-cdboot-2.04-23.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.aarch64.rpm"
        ],
        "noarch": [
          "grub2-help-2.04-23.oe1.noarch.rpm",
          "grub2-efi-x64-modules-2.04-23.oe1.noarch.rpm",
          "grub2-efi-ia32-modules-2.04-23.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-23.oe1.noarch.rpm",
          "grub2-common-2.04-23.oe1.noarch.rpm",
          "grub2-efi-aa64-modules-2.04-23.oe1.noarch.rpm"
        ],
        "src": [
          "grub2-2.04-23.oe1.src.rpm"
        ],
        "x86_64": [
          "grub2-tools-extra-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-x64-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-ia32-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-pc-2.04-23.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-23.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP2",
        "name": "grub2",
        "purl": "pkg:rpm/openEuler/grub2\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-23.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "grub2-efi-aa64-2.04-23.oe1.aarch64.rpm",
          "grub2-debuginfo-2.04-23.oe1.aarch64.rpm",
          "grub2-efi-aa64-cdboot-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-2.04-23.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-23.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-23.oe1.aarch64.rpm"
        ],
        "noarch": [
          "grub2-efi-x64-modules-2.04-23.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-23.oe1.noarch.rpm",
          "grub2-efi-aa64-modules-2.04-23.oe1.noarch.rpm",
          "grub2-common-2.04-23.oe1.noarch.rpm",
          "grub2-efi-ia32-modules-2.04-23.oe1.noarch.rpm",
          "grub2-help-2.04-23.oe1.noarch.rpm"
        ],
        "src": [
          "grub2-2.04-23.oe1.src.rpm"
        ],
        "x86_64": [
          "grub2-efi-ia32-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-extra-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-23.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-2.04-23.oe1.x86_64.rpm",
          "grub2-pc-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-x64-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-23.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-23.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-23.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-23.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "grub2",
        "purl": "pkg:rpm/openEuler/grub2\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-23.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "GNU GRUB is a Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn.\r\n\r\nSecurity Fix(es):\r\n\r\nA flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.(CVE-2021-3981)",
  "id": "OESA-2022-1597",
  "modified": "2026-08-06T11:04:52Z",
  "published": "2022-03-26T11:04:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1597"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3981"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "grub2 security update",
  "upstream": [
    "CVE-2021-3981"
  ]
}

CVE-2021-3981 (GCVE-0-2021-3981)

Vulnerability from cvelistv5 – Published: 2022-03-08 14:02 – Updated: 2025-02-13 16:28

Summary

Severity

No CVSS data available.

CWE

CWE-276

Assigner

redhat redhat root

References

4 references

URL	Tags
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://bugzilla.redhat.com/show_bug.cgi?id=2024170	x_refsource_MISC
https://security.gentoo.org/glsa/202209-12	vendor-advisoryx_refsource_GENTOO
http://www.openwall.com/lists/oss-security/2024/01/15/3

Impacted products

1 product

Vendor	Product	Version
n/a	grub2	Affected: grub2 2.06 and previous versions

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:09:09.874Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "FEDORA-2021-73d63662b0",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2024170"
          },
          {
            "name": "GLSA-202209-12",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202209-12"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/01/15/3"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grub2",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "grub2 2.06 and previous versions"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-276",
              "description": "CWE-276",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-16T00:06:22.834Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "name": "FEDORA-2021-73d63662b0",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2024170"
        },
        {
          "name": "GLSA-202209-12",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202209-12"
        },
        {
          "url": "http://www.openwall.com/lists/oss-security/2024/01/15/3"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-3981",
    "datePublished": "2022-03-08T14:02:15.000Z",
    "dateReserved": "2021-11-19T00:00:00.000Z",
    "dateUpdated": "2025-02-13T16:28:29.161Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

OESA-2022-1597 (CVE-2021-3981)

CVE-2021-3981 (GCVE-0-2021-3981)

Tags

Sightings

Nomenclature

Related by attack behaviour