{
  "GSD": {
    "alias": "CVE-2021-3450",
    "description": "The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).",
    "id": "GSD-2021-3450",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3450.html",
      "https://access.redhat.com/errata/RHSA-2021:1203",
      "https://access.redhat.com/errata/RHSA-2021:1202",
      "https://access.redhat.com/errata/RHSA-2021:1200",
      "https://access.redhat.com/errata/RHSA-2021:1199",
      "https://access.redhat.com/errata/RHSA-2021:1196",
      "https://access.redhat.com/errata/RHSA-2021:1195",
      "https://access.redhat.com/errata/RHSA-2021:1189",
      "https://access.redhat.com/errata/RHSA-2021:1024",
      "https://advisories.mageia.org/CVE-2021-3450.html",
      "https://security.archlinux.org/CVE-2021-3450",
      "https://linux.oracle.com/cve/CVE-2021-3450.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3450"
      ],
      "details": "The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).",
      "id": "GSD-2021-3450",
      "modified": "2023-12-13T01:23:34.717567Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "openssl-security@openssl.org",
        "DATE_PUBLIC": "2021-03-25",
        "ID": "CVE-2021-3450",
        "STATE": "PUBLIC",
        "TITLE": "CA certificate check bypass with X509_V_FLAG_X509_STRICT"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "OpenSSL",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j)"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "OpenSSL"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Benjamin Kaduk (Akamai), Xiang Ding (Akamai), others at Akamai"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j)."
          }
        ]
      },
      "impact": [
        {
          "lang": "eng",
          "url": "https://www.openssl.org/policies/secpolicy.html#High",
          "value": "High"
        }
      ],
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "Invalid Certificate Verification"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://www.openssl.org/news/secadv/20210325.txt",
            "refsource": "CONFIRM",
            "url": "https://www.openssl.org/news/secadv/20210325.txt"
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          {
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            "refsource": "CONFIRM",
            "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b"
          },
          {
            "name": "20210325 Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: March 2021",
            "refsource": "CISCO",
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd"
          },
          {
            "name": "[oss-security] 20210327 OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processing",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/03/27/1"
          },
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            "name": "[oss-security] 20210327 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processing",
            "refsource": "MLIST",
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          {
            "name": "[oss-security] 20210328 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processing",
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            "url": "http://www.openwall.com/lists/oss-security/2021/03/28/3"
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          {
            "name": "[oss-security] 20210328 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processing",
            "refsource": "MLIST",
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            "name": "FEDORA-2021-cbf14ab8f9",
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            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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            "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
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        {
          "affected_range": "\u003e=1.1.1h \u003c1.1.1k",
          "affected_versions": "All versions starting from 1.1.1h before 1.1.1k",
          "cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-295",
            "CWE-937"
          ],
          "date": "2023-08-04",
          "description": "The `X509_V_FLAG_X509_STRICT` flag enables additional security checks of the certificates present in a certificate chain. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a `purpose` has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named `purpose` values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A `purpose` is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the `X509_V_FLAG_X509_STRICT` verification flag and either not set a `purpose` for the certificate verification or, in the case of TLS client or server applications, override the default `purpose`.",
          "fixed_versions": [
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          ],
          "identifier": "CVE-2021-3450",
          "identifiers": [
            "CVE-2021-3450"
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          "not_impacted": "All versions before 1.1.1h, all versions starting from 1.1.1k",
          "package_slug": "conan/openssl",
          "pubdate": "2021-03-25",
          "solution": "Upgrade to version 1.1.1q or above.",
          "title": "Improper Certificate Validation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-3450",
            "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b",
            "https://www.openssl.org/news/secadv/20210325.txt"
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          "affected_versions": "All versions up to 8.0.23",
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          "cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
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            "CWE-295",
            "CWE-937"
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          "date": "2023-08-04",
          "description": "The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).",
          "fixed_versions": [],
          "identifier": "CVE-2021-3450",
          "identifiers": [
            "CVE-2021-3450"
          ],
          "not_impacted": "",
          "package_slug": "maven/mysql-connector-java",
          "pubdate": "2021-03-25",
          "solution": "Unfortunately, there is no solution available yet.",
          "title": "Improper Certificate Validation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-3450"
          ],
          "uuid": "bf44e8db-3946-4325-bd98-4568d9e2b3fd"
        },
        {
          "affected_range": "\u003c=8.0.23",
          "affected_versions": "All versions up to 8.0.23",
          "cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-295",
            "CWE-937"
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          "date": "2023-08-04",
          "description": "The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a \"purpose\" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named \"purpose\" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).",
          "fixed_versions": [
            "8.0.24"
          ],
          "identifier": "CVE-2021-3450",
          "identifiers": [
            "CVE-2021-3450"
          ],
          "not_impacted": "All versions after 8.0.23",
          "package_slug": "pypi/mysql-connector-python",
          "pubdate": "2021-03-25",
          "solution": "Upgrade to version 8.0.24 or above.",
          "title": "Improper Certificate Validation",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-3450",
            "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b",
            "https://www.openssl.org/news/secadv/20210325.txt",
            "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd",
            "https://security.netapp.com/advisory/ntap-20210326-0006/",
            "https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc",
            "http://www.openwall.com/lists/oss-security/2021/03/27/1",
            "http://www.openwall.com/lists/oss-security/2021/03/27/2",
            "http://www.openwall.com/lists/oss-security/2021/03/28/3",
            "http://www.openwall.com/lists/oss-security/2021/03/28/4",
            "https://security.gentoo.org/glsa/202103-03",
            "https://www.tenable.com/security/tns-2021-05",
            "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/",
            "https://www.tenable.com/security/tns-2021-08",
            "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10356",
            "https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html",
            "https://www.tenable.com/security/tns-2021-09",
            "https://www.oracle.com/security-alerts/cpuApr2021.html",
            "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845",
            "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013",
            "https://www.oracle.com//security-alerts/cpujul2021.html",
            "https://www.oracle.com/security-alerts/cpuoct2021.html",
            "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
            "https://www.oracle.com/security-alerts/cpuapr2022.html"
          ],
          "uuid": "31bd2f89-2664-4eb5-86a2-f3670f4585f6"
        }
      ]
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}