cve-2021-25216
Vulnerability from cvelistv5
Published
2021-04-29 00:55
Modified
2024-09-16 22:25
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.
References
security-officer@isc.orghttp://www.openwall.com/lists/oss-security/2021/04/29/1Mailing List, Third Party Advisory
security-officer@isc.orghttp://www.openwall.com/lists/oss-security/2021/04/29/2Mailing List, Third Party Advisory
security-officer@isc.orghttp://www.openwall.com/lists/oss-security/2021/04/29/3Mailing List, Third Party Advisory
security-officer@isc.orghttp://www.openwall.com/lists/oss-security/2021/04/29/4Mailing List, Third Party Advisory
security-officer@isc.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
security-officer@isc.orghttps://kb.isc.org/v1/docs/cve-2021-25215Not Applicable
security-officer@isc.orghttps://lists.debian.org/debian-lts-announce/2021/05/msg00001.htmlMailing List, Third Party Advisory
security-officer@isc.orghttps://security.netapp.com/advisory/ntap-20210521-0006/Third Party Advisory
security-officer@isc.orghttps://www.debian.org/security/2021/dsa-4909Third Party Advisory
security-officer@isc.orghttps://www.zerodayinitiative.com/advisories/ZDI-21-657/Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/29/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/29/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/29/3Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/29/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://kb.isc.org/v1/docs/cve-2021-25215Not Applicable
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/05/msg00001.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210521-0006/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4909Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.zerodayinitiative.com/advisories/ZDI-21-657/Third Party Advisory, VDB Entry
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

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            "lang": "en",
            "value": "Upgrade to the patched release most closely related to your current version of BIND:\n\n    BIND 9.11.31\n    BIND 9.16.15\n    BIND 9.17.12\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n    BIND 9.11.31-S1\n    BIND 9.16.15-S1"
          }
        ],
        "source": {
          "discovery": "EXTERNAL"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "This vulnerability only affects servers configured to use GSS-TSIG, most often to sign dynamic updates. If another mechanism can be used to authenticate updates, the vulnerability can be avoided by choosing not to enable the use of GSS-TSIG features.\n\nPrior to the April 2021 BIND releases, on some platforms it was possible to build a working BIND installation that was not vulnerable to CVE-2021-25216 by providing the --disable-isc-spnego command-line argument when running the ./configure script in the top level of the BIND source directory, before compiling and linking named.\n\nAfter the April 2021 BIND releases, all supported branches have removed isc-spnego support. This corrects CVE-2021-25216, but requires that the system have other libraries and header files to support GSS-TSIG functionality, unless such functionality is completely disabled at build time by providing the --without-gssapi argument to the ./configurescript when selecting build options."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
    "assignerShortName": "isc",
    "cveId": "CVE-2021-25216",
    "datePublished": "2021-04-29T00:55:17.362447Z",
    "dateReserved": "2021-01-15T00:00:00",
    "dateUpdated": "2024-09-16T22:25:23.581Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-25216\",\"sourceIdentifier\":\"security-officer@isc.org\",\"published\":\"2021-04-29T01:15:08.047\",\"lastModified\":\"2024-11-21T05:54:33.850\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In BIND 9.5.0 -\u003e 9.11.29, 9.12.0 -\u003e 9.16.13, and versions BIND 9.11.3-S1 -\u003e 9.11.29-S1 and 9.16.8-S1 -\u003e 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -\u003e 9.17.1 of the BIND 9.17 development branch, BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND\u0027s default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.\"},{\"lang\":\"es\",\"value\":\"En BIND versiones 9.5.0 posteriores a 9.11.29, versiones 9.12.0 posteriores  a 9.16.13, y BIND versiones 9.11.3-S1 posteriores a 9.11.29-S1 y versiones 9.16.8-S1 posteriores a 9.16.13-S1 de BIND Supported Preview Edition, as\u00ed como las versiones 9.17.0 posteriores 9.17.1 de la rama de desarrollo BIND 9.17, los servidores BIND son vulnerables si ejecutan una versi\u00f3n afectada y est\u00e1n configurados para usar las funcionalidades GSS-TSIG.\u0026#xa0;En una configuraci\u00f3n que usa la configuraci\u00f3n predeterminada de BIND, la ruta del c\u00f3digo vulnerable no est\u00e1 expuesta, pero un servidor puede volverse vulnerable al ajustar valores expl\u00edcitamente para las opciones de configuraci\u00f3n tkey-gssapi-keytab o tkey-gssapi-credential.\u0026#xa0;Aunque la configuraci\u00f3n predeterminada no es vulnerable, GSS-TSIG es usado con frecuencia en redes donde BIND est\u00e1 integrado con Samba, as\u00ed como en entornos de servidores mixtos que combinan servidores BIND con controladores de dominio de Active Directory.\u0026#xa0;Para los servidores que cumplen con estas condiciones, la implementaci\u00f3n de ISC SPNEGO es vulnerable a varios ataques, dependiendo de la arquitectura de la CPU para la que se construy\u00f3 BIND: Para binarios con nombre compilados para plataformas de 64 bits, este fallo puede ser usado para desencadenar una sobrelectura del b\u00fafer, conllevando a un bloqueo del servidor.\u0026#xa0;Para binarios con nombre compilados para plataformas de 32 bits, este fallo puede ser usado para desencadenar un bloqueo del servidor debido a un desbordamiento del b\u00fafer y posiblemente tambi\u00e9n para lograr la Ejecuci\u00f3n de C\u00f3digo Remota.\u0026#xa0;Hemos determinado que las implementaciones est\u00e1ndar de SPNEGO est\u00e1n disponibles en las bibliotecas MIT y Heimdal Kerberos, que admiten una amplia gama de sistemas operativos, lo que hace que la implementaci\u00f3n de ISC sea innecesaria y obsoleta.\u0026#xa0;Por lo tanto, para reducir la superficie de ataque para los usuarios de BIND, eliminaremos la implementaci\u00f3n de ISC SPNEGO en las versiones de abril de BIND 9.11 y 9.\u0026#xa0;16 (ya se hab\u00eda eliminado de BIND 9.17).\u0026#xa0;Normalmente no eliminar\u00edamos algo de una ESV (versi\u00f3n de soporte extendido) estable de BIND, pero dado que las bibliotecas del sistema pueden reemplazar la implementaci\u00f3n de ISC SPNEGO, hemos hecho una excepci\u00f3n en este caso por razones de estabilidad y 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List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/2\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/3\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/4\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://kb.isc.org/v1/docs/cve-2021-25215\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Not Applicable\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210521-0006/\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2021/dsa-4909\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-21-657/\",\"source\":\"security-officer@isc.org\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2021/04/29/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://kb.isc.org/v1/docs/cve-2021-25215\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Not Applicable\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210521-0006/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2021/dsa-4909\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-21-657/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]}]}}"
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.