GSD-2021-3521

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
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.
Aliases
Aliases
CVE-2021-3521
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{
  "GSD": {
    "alias": "CVE-2021-3521",
    "description": "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.",
    "id": "GSD-2021-3521",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3521.html",
      "https://access.redhat.com/errata/RHSA-2022:0634",
      "https://access.redhat.com/errata/RHSA-2022:0368",
      "https://access.redhat.com/errata/RHSA-2022:0254",
      "https://linux.oracle.com/cve/CVE-2021-3521.html",
      "https://advisories.mageia.org/CVE-2021-3521.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3521"
      ],
      "details": "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.",
      "id": "GSD-2021-3521",
      "modified": "2023-12-13T01:23:35.281268Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-3521",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "RPM",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "Fixed in rpm-4.18.0-beta1, rpm-4.18.0-alpha2, rpm-4.18.0-alpha1 ."
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
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            "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."
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-347",
                "lang": "eng",
                "value": "CWE-347 - Improper Verification of Cryptographic Signature"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
          },
          {
            "name": "https://access.redhat.com/security/cve/CVE-2021-3521",
            "refsource": "MISC",
            "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
          },
          {
            "name": "https://github.com/rpm-software-management/rpm/pull/1795/",
            "refsource": "MISC",
            "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
          },
          {
            "name": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8",
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            "url": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8"
          },
          {
            "name": "https://security.gentoo.org/glsa/202210-22",
            "refsource": "MISC",
            "url": "https://security.gentoo.org/glsa/202210-22"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:rpm:rpm:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "4.17.1",
                "vulnerable": true
              }
            ],
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          }
        ]
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          "ID": "CVE-2021-3521"
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        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "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."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-347"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://access.redhat.com/security/cve/CVE-2021-3521",
              "refsource": "MISC",
              "tags": [
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              "url": "https://access.redhat.com/security/cve/CVE-2021-3521"
            },
            {
              "name": "https://github.com/rpm-software-management/rpm/pull/1795/",
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              "url": "https://github.com/rpm-software-management/rpm/pull/1795/"
            },
            {
              "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098",
              "refsource": "MISC",
              "tags": [
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                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941098"
            },
            {
              "name": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
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              "url": "https://github.com/rpm-software-management/rpm/commit/bd36c5dc9fb6d90c46fbfed8c2d67516fc571ec8"
            },
            {
              "name": "GLSA-202210-22",
              "refsource": "GENTOO",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.gentoo.org/glsa/202210-22"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-02-12T23:41Z",
      "publishedDate": "2022-08-22T15:15Z"
    }
  }
}


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  • 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.
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