CVE-2021-23841 (GCVE-0-2021-23841)

Vulnerability from cvelistv5 – Published: 2021-02-16 16:55 – Updated: 2024-09-16 22:39
VLAI
Title
Null pointer deref in X509_issuer_and_serial_hash()
Summary
The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-26 20:18 UTC
CWE
  • NULL pointer dereference
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i)
Affected: Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)
Create a notification for this product.
Date Public
2021-02-16 00:00
Credits
Tavis Ormandy (Google)
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).\"}, {\"lang\": \"es\", \"value\": \"La funci\\u00f3n de la API p\\u00fablica de OpenSSL X509_issuer_and_serial_hash() intenta crear un valor hash \\u00fanico basado en los datos del emisor y del n\\u00famero de serie contenidos en un certificado X509. Sin embargo, no gestiona correctamente los errores que puedan producirse al analizar el campo del emisor (lo que podr\\u00eda ocurrir si el campo del emisor se construye de forma maliciosa). Esto puede dar lugar a un desv\\u00edo de puntero NULL y a un fallo que conduzca a un posible ataque de denegaci\\u00f3n de servicio. La funci\\u00f3n X509_issuer_and_serial_hash() nunca es llamada directamente por OpenSSL, por lo que las aplicaciones s\\u00f3lo son vulnerables si utilizan esta funci\\u00f3n directamente y lo hacen con certificados que pueden haber sido obtenidos de fuentes no fiables. Las versiones de OpenSSL 1.1.1i y posteriores est\\u00e1n afectadas por este problema. Los usuarios de estas versiones deber\\u00edan actualizar a OpenSSL 1.1.1j. Las versiones de OpenSSL 1.0.2x e inferiores se ven afectadas por este problema. Sin embargo, OpenSSL 1.0.2 est\\u00e1 fuera de soporte y ya no recibe actualizaciones p\\u00fablicas. Los clientes con soporte Premium de OpenSSL 1.0.2 deben actualizar a la versi\\u00f3n 1.0.2y. Los dem\\u00e1s usuarios deben actualizar a la versi\\u00f3n 1.1.1j. Corregido en OpenSSL 1.1.1j (Afectado 1.1.1-1.1.1i). Corregido en OpenSSL 1.0.2y (Afectado 1.0.2-1.0.2x)\"}]",
      "id": "CVE-2021-23841",
      "lastModified": "2024-11-21T05:51:55.460",
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      "published": "2021-02-16T17:15:13.377",
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      "sourceIdentifier": "openssl-security@openssl.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-476\"}]}]"
    },
    "microsoft_vex": {
      "current_release_date": "2025-09-03T22:33:59.000Z",
      "cve": "CVE-2021-23841",
      "id": "msrc_CVE-2021-23841",
      "initial_release_date": "2021-02-02T00:00:00.000Z",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Null pointer deref in X509_issuer_and_serial_hash()",
      "url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23841.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-23841\",\"sourceIdentifier\":\"openssl-security@openssl.org\",\"published\":\"2021-02-16T17:15:13.377\",\"lastModified\":\"2024-11-21T05:51:55.460\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. 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Esto puede dar lugar a un desv\u00edo de puntero NULL y a un fallo que conduzca a un posible ataque de denegaci\u00f3n de servicio. La funci\u00f3n X509_issuer_and_serial_hash() nunca es llamada directamente por OpenSSL, por lo que las aplicaciones s\u00f3lo son vulnerables si utilizan esta funci\u00f3n directamente y lo hacen con certificados que pueden haber sido obtenidos de fuentes no fiables. Las versiones de OpenSSL 1.1.1i y posteriores est\u00e1n afectadas por este problema. Los usuarios de estas versiones deber\u00edan actualizar a OpenSSL 1.1.1j. Las versiones de OpenSSL 1.0.2x e inferiores se ven afectadas por este problema. Sin embargo, OpenSSL 1.0.2 est\u00e1 fuera de soporte y ya no recibe actualizaciones p\u00fablicas. Los clientes con soporte Premium de OpenSSL 1.0.2 deben actualizar a la versi\u00f3n 1.0.2y. Los dem\u00e1s usuarios deben actualizar a la versi\u00f3n 1.1.1j. Corregido en OpenSSL 1.1.1j (Afectado 1.1.1-1.1.1i). 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      "product_status:known_affected": "16",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-23841.json",
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{\"id\": \"CVE-2021-23841\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-26T20:18:08.118870Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-26T20:18:14.332Z\"}}], \"cna\": {\"title\": \"Null pointer deref in X509_issuer_and_serial_hash()\", \"credits\": [{\"lang\": \"en\", \"value\": \"Tavis Ormandy (Google)\"}], \"metrics\": [{\"other\": {\"type\": \"unknown\", \"content\": {\"url\": \"https://www.openssl.org/policies/secpolicy.html#Moderate\", \"lang\": \"eng\", \"value\": \"Moderate\"}}}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i)\"}, {\"status\": \"affected\", \"version\": \"Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x)\"}]}], \"datePublic\": \"2021-02-16T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.openssl.org/news/secadv/20210216.txt\"}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=122a19ab48091c657f7cb1fb3af9fc07bd557bbf\"}, {\"url\": \"https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807\"}, {\"url\": \"https://www.debian.org/security/2021/dsa-4855\", \"name\": \"DSA-4855\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.gentoo.org/glsa/202103-03\", \"name\": \"GLSA-202103-03\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/70\", \"name\": \"20210526 APPLE-SA-2021-05-25-2 macOS Big Sur 11.4\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/68\", \"name\": \"20210526 APPLE-SA-2021-05-25-5 Safari 14.1.1\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2021/May/67\", \"name\": \"20210526 APPLE-SA-2021-05-25-1 iOS 14.6 and iPadOS 14.6\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\"}, {\"url\": \"https://www.tenable.com/security/tns-2021-09\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210513-0002/\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210219-0009/\"}, {\"url\": \"https://www.tenable.com/security/tns-2021-03\"}, {\"url\": \"https://support.apple.com/kb/HT212529\"}, {\"url\": \"https://support.apple.com/kb/HT212528\"}, {\"url\": \"https://support.apple.com/kb/HT212534\"}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\"}, {\"url\": \"https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240621-0006/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"NULL pointer dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2024-06-21T19:07:57.206Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-23841\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-09-16T22:39:57.576Z\", \"dateReserved\": \"2021-01-12T00:00:00.000Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2021-02-16T16:55:18.817Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.