cve-2020-1971
Vulnerability from cvelistv5
Published
2020-12-08 15:30
Modified
2024-09-17 02:57
Severity ?
Summary
The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL's s_server, s_client and verify tools have support for the "-crl_download" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).
References
openssl-security@openssl.orghttp://www.openwall.com/lists/oss-security/2021/09/14/2Mailing List, Third Party Advisory
openssl-security@openssl.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfThird Party Advisory
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2154ab83e14ede338d2ede9bbe5cdfce5d5a6c9e
openssl-security@openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f960d81215ebf3f65e03d4d5d857fb9b666d6920
openssl-security@openssl.orghttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44676Third Party Advisory
openssl-security@openssl.orghttps://lists.apache.org/thread.html/r63c6f2dd363d9b514d0a4bcf624580616a679898cc14c109a49b750c%40%3Cdev.tomcat.apache.org%3E
openssl-security@openssl.orghttps://lists.apache.org/thread.html/rbb769f771711fb274e0a4acb1b5911c8aab544a6ac5e8c12d40c5143%40%3Ccommits.pulsar.apache.org%3E
openssl-security@openssl.orghttps://lists.debian.org/debian-lts-announce/2020/12/msg00020.htmlMailing List, Third Party Advisory
openssl-security@openssl.orghttps://lists.debian.org/debian-lts-announce/2020/12/msg00021.htmlMailing List, Third Party Advisory
openssl-security@openssl.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DGSI34Y5LQ5RYXN4M2I5ZQT65LFVDOUU/
openssl-security@openssl.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PWPSSZNZOBJU2YR6Z4TGHXKYW3YP5QG7/
openssl-security@openssl.orghttps://security.FreeBSD.org/advisories/FreeBSD-SA-20:33.openssl.ascThird Party Advisory
openssl-security@openssl.orghttps://security.gentoo.org/glsa/202012-13Third Party Advisory
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20201218-0005/Third Party Advisory
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20210513-0002/Third Party Advisory
openssl-security@openssl.orghttps://security.netapp.com/advisory/ntap-20240621-0006/
openssl-security@openssl.orghttps://www.debian.org/security/2020/dsa-4807Third Party Advisory
openssl-security@openssl.orghttps://www.openssl.org/news/secadv/20201208.txtVendor Advisory
openssl-security@openssl.orghttps://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
openssl-security@openssl.orghttps://www.oracle.com/security-alerts/cpuoct2021.htmlThird Party Advisory
openssl-security@openssl.orghttps://www.tenable.com/security/tns-2020-11Third Party Advisory
openssl-security@openssl.orghttps://www.tenable.com/security/tns-2021-09Third Party Advisory
openssl-security@openssl.orghttps://www.tenable.com/security/tns-2021-10Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/09/14/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=2154ab83e14ede338d2ede9bbe5cdfce5d5a6c9e
af854a3a-2127-422b-91ae-364da2661108https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f960d81215ebf3f65e03d4d5d857fb9b666d6920
af854a3a-2127-422b-91ae-364da2661108https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44676Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r63c6f2dd363d9b514d0a4bcf624580616a679898cc14c109a49b750c%40%3Cdev.tomcat.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rbb769f771711fb274e0a4acb1b5911c8aab544a6ac5e8c12d40c5143%40%3Ccommits.pulsar.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/12/msg00020.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/12/msg00021.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DGSI34Y5LQ5RYXN4M2I5ZQT65LFVDOUU/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PWPSSZNZOBJU2YR6Z4TGHXKYW3YP5QG7/
af854a3a-2127-422b-91ae-364da2661108https://security.FreeBSD.org/advisories/FreeBSD-SA-20:33.openssl.ascThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202012-13Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20201218-0005/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210513-0002/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240621-0006/
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4807Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openssl.org/news/secadv/20201208.txtVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuoct2021.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/security/tns-2020-11Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/security/tns-2021-09Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/security/tns-2021-10Third Party Advisory
Impacted products
Vendor Product Version
OpenSSL OpenSSL Version: Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h)
Version: Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)
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      "descriptions": [
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          "value": "The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL\u0027s s_server, s_client and verify tools have support for the \"-crl_download\" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL\u0027s parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w)."
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      "title": "EDIPARTYNAME NULL pointer dereference"
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  "cveMetadata": {
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    "assignerShortName": "openssl",
    "cveId": "CVE-2020-1971",
    "datePublished": "2020-12-08T15:30:16.835255Z",
    "dateReserved": "2019-12-03T00:00:00",
    "dateUpdated": "2024-09-17T02:57:20.238Z",
    "state": "PUBLISHED"
  },
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    "nvd": "{\"cve\":{\"id\":\"CVE-2020-1971\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2020-12-08T16:15:11.730\",\"lastModified\":\"2024-11-21T05:11:45.673\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The X.509 GeneralName type is a generic type for representing different types of names. One of those name types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1) Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an attacker can control both items being compared then that attacker could trigger a crash. For example if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a certificate. This checking happens prior to the signatures on the certificate and CRL being verified. OpenSSL\u0027s s_server, s_client and verify tools have support for the \\\"-crl_download\\\" option which implements automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL\u0027s parser will accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue. Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected 1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w).\"},{\"lang\":\"es\",\"value\":\"El tipo GeneralName X.509 es un tipo gen\u00e9rico para representar diferentes tipos de nombres.\u0026#xa0;Uno de esos tipos de nombres se conoce como EDIPartyName.\u0026#xa0;OpenSSL proporciona una funci\u00f3n GENERAL_NAME_cmp que compara diferentes instancias de GENERAL_NAME para ver si son iguales o no.\u0026#xa0;Esta funci\u00f3n se comporta incorrectamente cuando ambos GENERAL_NAME contienen un EDIPARTYNAME.\u0026#xa0;Es posible que se produzca una desreferencia del puntero NULL y un bloqueo que conduzca a un posible ataque de denegaci\u00f3n de servicio.\u0026#xa0;El propio OpenSSL usa la funci\u00f3n GENERAL_NAME_cmp para dos prop\u00f3sitos:\u0026#xa0;1) Comparaci\u00f3n de nombres de puntos de distribuci\u00f3n de CRL entre una CRL disponible y un punto de distribuci\u00f3n de CRL insertado en un certificado X509 2) Al comparar que un firmante de token de respuesta de marca de tiempo coincide con el nombre de autoridad de marca de tiempo (expuesto por medio de las funciones API TS_RESP_verify_response y TS_RESP_verify_token) Si un atacante puede controlar ambos elementos que se est\u00e1n comparando, entonces ese atacante podr\u00eda desencadenar un bloqueo.\u0026#xa0;Por ejemplo, si el atacante puede enga\u00f1ar a un cliente o servidor para que compruebe un certificado malicioso con una CRL maliciosa, esto puede ocurrir.\u0026#xa0;Tome en cuenta que algunas aplicaciones descargan autom\u00e1ticamente las CRL basadas en una URL insertada en un certificado.\u0026#xa0;Esta comprobaci\u00f3n ocurre antes de que se verifiquen las firmas en el certificado y la CRL.\u0026#xa0;Las herramientas s_server, s_client y verify de OpenSSL tienen soporte para la opci\u00f3n \\\"-crl_download\\\"\u0026#xa0;que implementa la descarga autom\u00e1tica de CRL y se ha demostrado que este ataque funciona contra esas herramientas.\u0026#xa0;Tome en cuenta que un error no relacionado significa que las versiones afectadas de OpenSSL no pueden analizar ni construir codificaciones correctas de EDIPARTYNAME.\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versiones 1.1.1i (Afectado versiones 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versiones 1.0.2x (Afectado versiones 1.0.2-1.0.2w).\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.1.1i (Afectada versi\u00f3n 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2x (Afectada versi\u00f3n 1.0.2-1.0.2w).\u0026#xa0;Sin embargo, es posible construir un EDIPARTYNAME malformado que el analizador de OpenSSL aceptar\u00e1 y, por lo tanto, desencadenar\u00e1 este ataque.\u0026#xa0;Todas las versiones de OpenSSL 1.1.1 y 1.0.2 est\u00e1n afectadas por este problema.\u0026#xa0;Otras versiones de OpenSSL no son compatibles y no se han comprobado.\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.1.1i (Afectada versi\u00f3n 1.1.1-1.1.1h).\u0026#xa0;Corregido en OpenSSL versi\u00f3n 1.0.2x (Afectada versi\u00f3n 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}