Vulnerability-Lookup

OESA-2021-1431 (CVE-2021-3521)

Vulnerability from osv_openeuler – Published: 2021-11-12 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

rpm security update

Details

The RPM Package Manager (RPM) is a powerful package management system capability as below

Security Fix(es):

The OpenPGP subkey is associated with the master key through a binding signature. RPM will not check their binding signature before importing the subkey; if the attacker can add it or the other party of social engineering adds the malicious subkey to the legal public Key, RPM may mistakenly trust malicious signatures.(CVE-2021-3521)

Severity

4.4 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-3521	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "rpm-4.15.1-26.oe1.aarch64.rpm",
          "rpm-plugin-systemd-inhibit-4.15.1-26.oe1.aarch64.rpm",
          "python2-rpm-4.15.1-26.oe1.aarch64.rpm",
          "python3-rpm-4.15.1-26.oe1.aarch64.rpm",
          "rpm-libs-4.15.1-26.oe1.aarch64.rpm",
          "rpm-debugsource-4.15.1-26.oe1.aarch64.rpm",
          "rpm-devel-4.15.1-26.oe1.aarch64.rpm",
          "rpm-build-4.15.1-26.oe1.aarch64.rpm",
          "rpm-debuginfo-4.15.1-26.oe1.aarch64.rpm"
        ],
        "noarch": [
          "rpm-help-4.15.1-26.oe1.noarch.rpm"
        ],
        "src": [
          "rpm-4.15.1-26.oe1.src.rpm"
        ],
        "x86_64": [
          "python2-rpm-4.15.1-26.oe1.x86_64.rpm",
          "rpm-debuginfo-4.15.1-26.oe1.x86_64.rpm",
          "rpm-debugsource-4.15.1-26.oe1.x86_64.rpm",
          "rpm-build-4.15.1-26.oe1.x86_64.rpm",
          "python3-rpm-4.15.1-26.oe1.x86_64.rpm",
          "rpm-devel-4.15.1-26.oe1.x86_64.rpm",
          "rpm-plugin-systemd-inhibit-4.15.1-26.oe1.x86_64.rpm",
          "rpm-4.15.1-26.oe1.x86_64.rpm",
          "rpm-libs-4.15.1-26.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "rpm",
        "purl": "pkg:rpm/openEuler/rpm\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.1-26.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "rpm-debugsource-4.15.1-30.oe1.aarch64.rpm",
          "rpm-libs-4.15.1-30.oe1.aarch64.rpm",
          "python2-rpm-4.15.1-30.oe1.aarch64.rpm",
          "rpm-plugin-systemd-inhibit-4.15.1-30.oe1.aarch64.rpm",
          "rpm-devel-4.15.1-30.oe1.aarch64.rpm",
          "rpm-build-4.15.1-30.oe1.aarch64.rpm",
          "rpm-4.15.1-30.oe1.aarch64.rpm",
          "python3-rpm-4.15.1-30.oe1.aarch64.rpm",
          "rpm-debuginfo-4.15.1-30.oe1.aarch64.rpm"
        ],
        "noarch": [
          "rpm-help-4.15.1-30.oe1.noarch.rpm"
        ],
        "src": [
          "rpm-4.15.1-30.oe1.src.rpm"
        ],
        "x86_64": [
          "rpm-plugin-systemd-inhibit-4.15.1-30.oe1.x86_64.rpm",
          "python3-rpm-4.15.1-30.oe1.x86_64.rpm",
          "rpm-4.15.1-30.oe1.x86_64.rpm",
          "rpm-libs-4.15.1-30.oe1.x86_64.rpm",
          "python2-rpm-4.15.1-30.oe1.x86_64.rpm",
          "rpm-debuginfo-4.15.1-30.oe1.x86_64.rpm",
          "rpm-build-4.15.1-30.oe1.x86_64.rpm",
          "rpm-devel-4.15.1-30.oe1.x86_64.rpm",
          "rpm-debugsource-4.15.1-30.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP2",
        "name": "rpm",
        "purl": "pkg:rpm/openEuler/rpm\u0026distro=openEuler-20.03-LTS-SP2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.1-30.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Low"
  },
  "details": "The RPM Package Manager (RPM) is a powerful package management system capability as below\r\n\r\nSecurity Fix(es):\r\n\r\nThe OpenPGP subkey is associated with the master key through a binding signature. RPM will not check their binding signature before importing the subkey; if the attacker can add it or the other party of social engineering adds the malicious subkey to the legal public Key, RPM may mistakenly trust malicious signatures.(CVE-2021-3521)",
  "id": "OESA-2021-1431",
  "modified": "2026-08-06T11:04:42Z",
  "published": "2021-11-12T11:04:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1431"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3521"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rpm security update",
  "upstream": [
    "CVE-2021-3521"
  ]
}

CVE-2021-3521 (GCVE-0-2021-3521)

Vulnerability from cvelistv5 – Published: 2022-08-22 00:00 – Updated: 2024-08-03 17:01

Summary

There is a flaw in RPM's signature functionality. OpenPGP subkeys are associated with a primary key via a "binding signature." RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources.

Severity

No CVSS data available.

CWE

CWE-347 - - Improper Verification of Cryptographic Signature

Assigner

redhat redhat root

References

5 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1941098
https://access.redhat.com/security/cve/CVE-2021-3521
https://github.com/rpm-software-management/rpm/pu…
https://github.com/rpm-software-management/rpm/co…
https://security.gentoo.org/glsa/202210-22	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
n/a	RPM	Affected: Fixed in rpm-4.18.0-beta1, rpm-4.18.0-alpha2, rpm-4.18.0-alpha1 .

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:01:07.975Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
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            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
          },
          {
            "tags": [
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            ],
            "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8"
          },
          {
            "name": "GLSA-202210-22",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202210-22"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "RPM",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Fixed in rpm-4.18.0-beta1, rpm-4.18.0-alpha2, rpm-4.18.0-alpha1 ."
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "There is a flaw in RPM\u0027s signature functionality. OpenPGP subkeys are associated with a primary key via a \"binding signature.\" RPM does not check the binding signature of subkeys prior to importing them. If an attacker is able to add or socially engineer another party to add a malicious subkey to a legitimate public key, RPM could wrongly trust a malicious signature. The greatest impact of this flaw is to data integrity. To exploit this flaw, an attacker must either compromise an RPM repository or convince an administrator to install an untrusted RPM or public key. It is strongly recommended to only use RPMs and public keys from trusted sources."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347 - Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-10-31T00:00:00.000Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
        },
        {
          "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
        },
        {
          "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
        },
        {
          "url": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8"
        },
        {
          "name": "GLSA-202210-22",
          "tags": [
            "vendor-advisory"
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          "url": "https://security.gentoo.org/glsa/202210-22"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2021-3521",
    "datePublished": "2022-08-22T00:00:00.000Z",
    "dateReserved": "2021-04-28T00:00:00.000Z",
    "dateUpdated": "2024-08-03T17:01:07.975Z",
    "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.

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

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