CVE-2021-3521
Vulnerability from cvelistv5
Published
2022-08-22 00:00
Modified
2024-08-03 17:01
Severity ?
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.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2021-3521Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1941098Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/rpm-software-management/rpm/pull/1795/Patch, Third Party Advisory
secalert@redhat.comhttps://security.gentoo.org/glsa/202210-22Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2021-3521Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1941098Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/rpm-software-management/rpm/pull/1795/Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202210-22Third Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T17:01:07.975Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
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            "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
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            "tags": [
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            ],
            "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
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            "url": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8"
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            "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": [
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          "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"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2022-10-31T00:00:00",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
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      "references": [
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
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        {
          "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
        },
        {
          "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
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        {
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        },
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          "name": "GLSA-202210-22",
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            "vendor-advisory"
          ],
          "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",
    "dateReserved": "2021-04-28T00:00:00",
    "dateUpdated": "2024-08-03T17:01:07.975Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-3521\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2022-08-22T15:15:13.473\",\"lastModified\":\"2024-11-21T06:21:45.260\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"value\":\"Se presenta un fallo en la funcionalidad de firma de RPM. Las subclaves OpenPGP se asocian a una clave primaria por medio de una \\\"firma vinculante\\\". RPM no comprueba la firma vinculante de las subclaves antes de importarlas. Si un atacante es capaz de a\u00f1adir o hacer ingenier\u00eda social para que otra parte a\u00f1ada una subclave maliciosa a una clave p\u00fablica leg\u00edtima, RPM podr\u00eda confiar err\u00f3neamente en una firma maliciosa. El mayor impacto de este fallo es la integridad de los datos. Para explotar este fallo, un atacante debe comprometer un repositorio de RPM o convencer a un administrador para que instale un RPM o una clave p\u00fablica que no sean confiables. Es recomendado encarecidamente usar s\u00f3lo RPMs y claves p\u00fablicas de fuentes confiables.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"secalert@redhat.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-347\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-347\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.17.1\",\"matchCriteriaId\":\"1074C3F6-BFE3-45EC-B03B-F39E7DC4E323\"}]}]}],\"references\":[{\"url\":\"https://access.redhat.com/security/cve/CVE-2021-3521\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1941098\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/rpm-software-management/rpm/pull/1795/\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202210-22\",\"source\":\"secalert@redhat.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://access.redhat.com/security/cve/CVE-2021-3521\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1941098\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/rpm-software-management/rpm/pull/1795/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202210-22\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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