{"containers": {"cna": {"affected": [{"product": "BIND9", "vendor": "ISC", "versions": [{"status": "affected", "version": "Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.31"}, {"status": "affected", "version": "Open Source Branches 9.12 though 9.16 9.12.0 through versions before 9.16.14"}, {"status": "affected", "version": "Supported Preview Branch 9.11-S 9.11.3-S1 through versions before 9.11.31-S1"}, {"status": "affected", "version": "Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1"}, {"status": "affected", "version": "Development Branch 9.17 9.17.0 through versions before 9.17.2"}]}], "credits": [{"lang": "en", "value": "ISC would like to thank an anonymous party, working in conjunction with Trend Micro Zero Day Initiative, for reporting this issue to us."}], "datePublic": "2021-04-28T00:00:00", "descriptions": [{"lang": "en", "value": "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). 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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."}, {"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. 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. 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. 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. 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. 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. 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. 16 (ya se hab\u00eda eliminado de BIND 9.17). 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 seguridad"}], "id": "CVE-2021-25216", "lastModified": "2024-11-21T05:54:33.850", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, 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"confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-04-29T01:15:08.047", "references": [{"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/04/29/1"}, {"source": "security-officer@isc.org", "tags": ["Mailing 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"}, 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{"acknowledgement": "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges Trend Micro Zero Day Initiative as the original reporter.", "bugzilla": {"description": "bind: Vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack", "id": "1953872", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1953872"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["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.", "A flaw was found in bind. The SPNEGO implementation used by BIND, which is a negotiation mechanism used by GSSAPI to support the secure exchange of keys used to verify the authenticity of communications between parties on a network, is subject to a buffer overflow attack. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "mitigation": {"lang": "en:us", "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."}, "name": "CVE-2021-25216", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "bind97", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-04-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-25216\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25216\nhttps://kb.isc.org/docs/cve-2021-25216"], "statement": "Versions of bind package shipped with Red Hat Enterprise Linux do not enable ISC SPNEGO and therefore are not affected by this flaw.", "threat_severity": "Important", "upstream_fix": "bind 9.11.30, bind 9.16.14, bind 9.17.12"}