CVE-2021-3712 (GCVE-0-2021-3712)
Vulnerability from cvelistv5
Published
2021-08-24 14:50
Modified
2024-09-16 20:32
Severity ?
CWE
  • Buffer overflow
Summary
ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL's own "d2i" functions (and other similar parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array by directly setting the "data" and "length" fields in the ASN1_STRING array. This can also happen by using the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to assume that the ASN1_STRING byte array will be NUL terminated, even though this is not guaranteed for strings that have been directly constructed. Where an application requests an ASN.1 structure to be printed, and where that ASN.1 structure contains ASN1_STRINGs that have been directly constructed by the application without NUL terminating the "data" field, then a read buffer overrun can occur. The same thing can also occur during name constraints processing of certificates (for example if a certificate has been directly constructed by the application instead of loading it via the OpenSSL parsing functions, and the certificate contains non NUL terminated ASN1_STRING structures). It can also occur in the X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions. If a malicious actor can cause an application to directly construct an ASN1_STRING and then process it through one of the affected OpenSSL functions then this issue could be hit. This might result in a crash (causing a Denial of Service attack). It could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext). Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). Fixed in OpenSSL 1.0.2za (Affected 1.0.2-1.0.2y).
References
openssl-security@openssl.org http://www.openwall.com/lists/oss-security/2021/08/26/2 Mailing List, Third Party Advisory
openssl-security@openssl.org https://cert-portal.siemens.com/productcert/pdf/ssa-244969.pdf Patch, Third Party Advisory
openssl-security@openssl.org https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
openssl-security@openssl.org https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=94d23fcff9b2a7a8368dfe52214d5c2569882c11
openssl-security@openssl.org https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ccb0a11145ee72b042d10593a64eaf9e8a55ec12
openssl-security@openssl.org https://kc.mcafee.com/corporate/index?page=content&id=SB10366 Third Party Advisory
openssl-security@openssl.org https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E
openssl-security@openssl.org https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E
openssl-security@openssl.org https://lists.debian.org/debian-lts-announce/2021/09/msg00014.html Mailing List, Third Party Advisory
openssl-security@openssl.org https://lists.debian.org/debian-lts-announce/2021/09/msg00021.html Mailing List, Third Party Advisory
openssl-security@openssl.org https://security.gentoo.org/glsa/202209-02 Third Party Advisory
openssl-security@openssl.org https://security.gentoo.org/glsa/202210-02 Third Party Advisory
openssl-security@openssl.org https://security.netapp.com/advisory/ntap-20210827-0010/ Third Party Advisory
openssl-security@openssl.org https://security.netapp.com/advisory/ntap-20240621-0006/
openssl-security@openssl.org https://www.debian.org/security/2021/dsa-4963 Third Party Advisory
openssl-security@openssl.org https://www.openssl.org/news/secadv/20210824.txt Vendor Advisory
openssl-security@openssl.org https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
openssl-security@openssl.org https://www.oracle.com/security-alerts/cpujan2022.html Third Party Advisory
openssl-security@openssl.org https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
openssl-security@openssl.org https://www.tenable.com/security/tns-2021-16 Third Party Advisory
openssl-security@openssl.org https://www.tenable.com/security/tns-2022-02 Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 http://www.openwall.com/lists/oss-security/2021/08/26/2 Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://cert-portal.siemens.com/productcert/pdf/ssa-244969.pdf Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=94d23fcff9b2a7a8368dfe52214d5c2569882c11
af854a3a-2127-422b-91ae-364da2661108 https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=ccb0a11145ee72b042d10593a64eaf9e8a55ec12
af854a3a-2127-422b-91ae-364da2661108 https://kc.mcafee.com/corporate/index?page=content&id=SB10366 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://lists.apache.org/thread.html/r18995de860f0e63635f3008fd2a6aca82394249476d21691e7c59c9e%40%3Cdev.tomcat.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108 https://lists.apache.org/thread.html/rad5d9f83f0d11fb3f8bb148d179b8a9ad7c6a17f18d70e5805a713d1%40%3Cdev.tomcat.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2021/09/msg00014.html Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2021/09/msg00021.html Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.gentoo.org/glsa/202209-02 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.gentoo.org/glsa/202210-02 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.netapp.com/advisory/ntap-20210827-0010/ Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.netapp.com/advisory/ntap-20240621-0006/
af854a3a-2127-422b-91ae-364da2661108 https://www.debian.org/security/2021/dsa-4963 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.openssl.org/news/secadv/20210824.txt Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.oracle.com/security-alerts/cpujan2022.html Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.tenable.com/security/tns-2021-16 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://www.tenable.com/security/tns-2022-02 Patch, Third Party Advisory
Impacted products
Vendor Product Version
OpenSSL OpenSSL Version: Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k)
Version: Fixed in OpenSSL 1.0.2za (Affected 1.0.2-1.0.2y)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-3712\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2021-08-24T15:15:09.533\",\"lastModified\":\"2024-11-21T06:22:13.290\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not a strict requirement, ASN.1 strings that are parsed using OpenSSL\u0027s own \\\"d2i\\\" functions (and other similar parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array by directly setting the \\\"data\\\" and \\\"length\\\" fields in the ASN1_STRING array. This can also happen by using the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to assume that the ASN1_STRING byte array will be NUL terminated, even though this is not guaranteed for strings that have been directly constructed. Where an application requests an ASN.1 structure to be printed, and where that ASN.1 structure contains ASN1_STRINGs that have been directly constructed by the application without NUL terminating the \\\"data\\\" field, then a read buffer overrun can occur. The same thing can also occur during name constraints processing of certificates (for example if a certificate has been directly constructed by the application instead of loading it via the OpenSSL parsing functions, and the certificate contains non NUL terminated ASN1_STRING structures). It can also occur in the X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions. If a malicious actor can cause an application to directly construct an ASN1_STRING and then process it through one of the affected OpenSSL functions then this issue could be hit. This might result in a crash (causing a Denial of Service attack). It could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext). Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). Fixed in OpenSSL 1.0.2za (Affected 1.0.2-1.0.2y).\"},{\"lang\":\"es\",\"value\":\"Las cadenas ASN.1 se representan internamente en OpenSSL como una estructura ASN1_STRING que contiene un b\u00fafer que contiene los datos de la cadena y un campo que contiene la longitud del b\u00fafer. Esto contrasta con las cadenas C normales, que se representan como un b\u00fafer para los datos de la cadena que termina con un byte NUL (0). Aunque no es un requisito estricto, las cadenas ASN.1 que se analizan usando las propias funciones \\\"d2i\\\" de OpenSSL (y otras funciones de an\u00e1lisis similares), as\u00ed como cualquier cadena cuyo valor ha sido ajustado con la funci\u00f3n ASN1_STRING_set(), terminar\u00e1n adicionalmente con NUL la matriz de bytes en la estructura ASN1_STRING. Sin embargo, es posible que las aplicaciones construyan directamente estructuras ASN1_STRING v\u00e1lidas que no terminen en NUL la matriz de bytes, ajustando directamente los campos \\\"data\\\" y \\\"length\\\" en la matriz ASN1_STRING. Esto tambi\u00e9n puede ocurrir usando la funci\u00f3n ASN1_STRING_set0(). Se ha detectado que numerosas funciones de OpenSSL que imprimen datos ASN.1 asumen que la matriz de bytes ASN1_STRING estar\u00e1 terminada en NUL, aunque esto no est\u00e1 garantizado para las cadenas que han sido construidas directamente. Cuando una aplicaci\u00f3n pide que se imprima una estructura ASN.1, y cuando esa estructura ASN.1 contiene ASN1_STRINGs que han sido construidos directamente por la aplicaci\u00f3n sin terminar en NUL el campo \\\"data\\\", entonces puede ocurrir un desbordamiento del buffer de lectura. Lo mismo puede ocurrir durante el procesamiento de las restricciones de nombre de los certificados (por ejemplo, si un certificado ha sido construido directamente por la aplicaci\u00f3n en lugar de cargarlo por medio de las funciones de an\u00e1lisis de OpenSSL, y el certificado contiene estructuras ASN1_STRING sin terminaci\u00f3n NUL). Tambi\u00e9n puede ocurrir en las funciones X509_get1_email(), X509_REQ_get1_email() y X509_get1_ocsp(). Si un actor malicioso puede hacer que una aplicaci\u00f3n construya directamente un ASN1_STRING y luego lo procese a mediante una de las funciones de OpenSSL afectadas, este problema podr\u00eda ser alcanzado. Esto podr\u00eda resultar en un bloqueo (causando un ataque de Denegaci\u00f3n de Servicio). Tambi\u00e9n podr\u00eda resultar en la revelaci\u00f3n de contenidos de memoria privada (como claves privadas, o texto plano confidencial). Corregido en OpenSSL versi\u00f3n 1.1.1l (Afectada 1.1.1-1.1.1k). Corregido en OpenSSL versi\u00f3n 1.0.2za (Afectada 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Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202210-02\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210827-0010/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20240621-0006/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.debian.org/security/2021/dsa-4963\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.openssl.org/news/secadv/20210824.txt\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor 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/cpujan2022.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"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-2021-16\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2022-02\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]}]}}"
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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