CVE-2021-3450 (GCVE-0-2021-3450)

Vulnerability from cvelistv5 – Published: 2021-03-25 14:25 – Updated: 2024-09-17 03:07
VLAI
Title
CA certificate check bypass with X509_V_FLAG_X509_STRICT
Summary
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).
Severity
No CVSS data available.
CWE
  • Invalid Certificate Verification
Assigner
References
URL Tags
https://www.openssl.org/news/secadv/20210325.txt x_refsource_CONFIRM
https://git.openssl.org/gitweb/?p=openssl.git%3Ba… x_refsource_CONFIRM
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
http://www.openwall.com/lists/oss-security/2021/03/27/1 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/03/27/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/03/28/3 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/03/28/4 mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202103-03 vendor-advisoryx_refsource_GENTOO
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
https://www.tenable.com/security/tns-2021-09 x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2021032… x_refsource_CONFIRM
https://security.FreeBSD.org/advisories/FreeBSD-S… x_refsource_MISC
https://www.tenable.com/security/tns-2021-05 x_refsource_CONFIRM
https://kc.mcafee.com/corporate/index?page=conten… x_refsource_CONFIRM
https://www.tenable.com/security/tns-2021-08 x_refsource_CONFIRM
https://mta.openssl.org/pipermail/openssl-announc… x_refsource_MISC
https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
https://kb.pulsesecure.net/articles/Pulse_Securit… x_refsource_CONFIRM
https://psirt.global.sonicwall.com/vuln-detail/SN… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/s… x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpujul2022.html x_refsource_MISC
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j)
Create a notification for this product.
Date Public
2021-03-25 00:00
Credits
Benjamin Kaduk (Akamai), Xiang Ding (Akamai), others at Akamai
Show details on NVD website
To clipboard 

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              "url": "https://security.gentoo.org/glsa/202103-03"
            },
            {
              "name": "FEDORA-2021-cbf14ab8f9",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
            },
            {
              "name": "https://www.tenable.com/security/tns-2021-09",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2021-09"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20210326-0006/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20210326-0006/"
            },
            {
              "name": "https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc",
              "refsource": "MISC",
              "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc"
            },
            {
              "name": "https://www.tenable.com/security/tns-2021-05",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2021-05"
            },
            {
              "name": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10356",
              "refsource": "CONFIRM",
              "url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10356"
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            {
              "name": "https://www.tenable.com/security/tns-2021-08",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2021-08"
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            {
              "name": "https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html",
              "refsource": "MISC",
              "url": "https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html"
            },
            {
              "name": "https://www.oracle.com//security-alerts/cpujul2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
            },
            {
              "name": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845",
              "refsource": "CONFIRM",
              "url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845"
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            {
              "name": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013",
              "refsource": "CONFIRM",
              "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013"
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            {
              "name": "https://www.oracle.com/security-alerts/cpuoct2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
              "refsource": "CONFIRM",
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujul2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
            }
          ]
        }
      }
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  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2021-3450",
    "datePublished": "2021-03-25T14:25:14.287Z",
    "dateReserved": "2021-03-19T00:00:00.000Z",
    "dateUpdated": "2024-09-17T03:07:10.879Z",
    "state": "PUBLISHED"
  },
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      "descriptions": "[{\"lang\": \"en\", \"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).\"}, {\"lang\": \"es\", \"value\": \"El flag X509_V_FLAG_X509_STRICT permite llevar a cabo comprobaciones de seguridad adicionales de los certificados presentes en una cadena de certificados. No est\\u00e1 establecido por defecto. A partir de la versi\\u00f3n 1.1.1h de OpenSSL, se a\\u00f1adi\\u00f3 como comprobaci\\u00f3n estricta adicional la de no permitir certificados en la cadena que tengan par\\u00e1metros de curva el\\u00edptica codificados expl\\u00edcitamente. Un error en la implementaci\\u00f3n de esta comprobaci\\u00f3n significaba que el resultado de una comprobaci\\u00f3n previa para confirmar que los certificados de la cadena son certificados de CA v\\u00e1lidos fueron sobrescritos. De este modo, se omite la comprobaci\\u00f3n de que los certificados que no son de CA no deben poder emitir otros certificados. Si se ha configurado un \\\"purpose\\\", se presenta la posibilidad de comprobar posteriormente que el certificado es una CA v\\u00e1lida. Todos los valores de \\\"purpose\\\" implementados en libcrypto llevan a cabo esta comprobaci\\u00f3n. Por lo tanto, cuando se establece un prop\\u00f3sito, la cadena de certificados seguir\\u00e1 siendo rechazada inclusive cuando se haya usado el flag strict. Se establece un prop\\u00f3sito por defecto en las rutinas de verificaci\\u00f3n de certificados de cliente servidor de libssl, pero puede ser anulado o eliminado por una aplicaci\\u00f3n. Para que se vea afectada, una aplicaci\\u00f3n debe establecer expl\\u00edcitamente el flag de verificaci\\u00f3n X509_V_FLAG_X509_STRICT y no establecer un prop\\u00f3sito para la verificaci\\u00f3n de certificados o, en el caso de las aplicaciones de cliente o servidor TLS, anular el prop\\u00f3sito por defecto. Este problema afecta a las versiones 1.1.1h y posteriores de OpenSSL. Los usuarios de estas versiones deben actualizar a OpenSSL versi\\u00f3n 1.1.1k. OpenSSL versi\\u00f3n 1.0.2 no est\\u00e1 afectado por este problema. Corregido en OpenSSL versi\\u00f3n 1.1.1k (Afectadas versiones 1.1.1h-1.1.1j)\"}]",
      "id": "CVE-2021-3450",
      "lastModified": "2024-11-21T06:21:33.633",
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      "published": "2021-03-25T15:15:13.560",
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\"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10356\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/\", \"source\": \"openssl-security@openssl.org\"}, {\"url\": \"https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html\", \"source\": \"openssl-security@openssl.org\", \"tags\": [\"Mailing List\", \"Vendor Advisory\"]}, {\"url\": \"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013\", \"source\": \"openssl-security@openssl.org\", 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      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-295\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-3450\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2021-03-25T15:15:13.560\",\"lastModified\":\"2024-11-21T06:21:33.633\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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).\"},{\"lang\":\"es\",\"value\":\"El flag X509_V_FLAG_X509_STRICT permite llevar a cabo comprobaciones de seguridad adicionales de los certificados presentes en una cadena de certificados. No est\u00e1 establecido por defecto. A partir de la versi\u00f3n 1.1.1h de OpenSSL, se a\u00f1adi\u00f3 como comprobaci\u00f3n estricta adicional la de no permitir certificados en la cadena que tengan par\u00e1metros de curva el\u00edptica codificados expl\u00edcitamente. Un error en la implementaci\u00f3n de esta comprobaci\u00f3n significaba que el resultado de una comprobaci\u00f3n previa para confirmar que los certificados de la cadena son certificados de CA v\u00e1lidos fueron sobrescritos. De este modo, se omite la comprobaci\u00f3n de que los certificados que no son de CA no deben poder emitir otros certificados. Si se ha configurado un \\\"purpose\\\", se presenta la posibilidad de comprobar posteriormente que el certificado es una CA v\u00e1lida. Todos los valores de \\\"purpose\\\" implementados en libcrypto llevan a cabo esta comprobaci\u00f3n. Por lo tanto, cuando se establece un prop\u00f3sito, la cadena de certificados seguir\u00e1 siendo rechazada inclusive cuando se haya usado el flag strict. Se establece un prop\u00f3sito por defecto en las rutinas de verificaci\u00f3n de certificados de cliente servidor de libssl, pero puede ser anulado o eliminado por una aplicaci\u00f3n. Para que se vea afectada, una aplicaci\u00f3n debe establecer expl\u00edcitamente el flag de verificaci\u00f3n X509_V_FLAG_X509_STRICT y no establecer un prop\u00f3sito para la verificaci\u00f3n de certificados o, en el caso de las aplicaciones de cliente o servidor TLS, anular el prop\u00f3sito por defecto. Este problema afecta a las versiones 1.1.1h y posteriores de OpenSSL. Los usuarios de estas versiones deben actualizar a OpenSSL versi\u00f3n 1.1.1k. OpenSSL versi\u00f3n 1.0.2 no est\u00e1 afectado por este problema. 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Advisory\"]},{\"url\":\"https://www.oracle.com//security-alerts/cpujul2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuApr2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuapr2022.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpujul2022.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2021-05\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2021-08\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2021-09\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.