Update policies krb5-subdomain and ms-subdomain do not enforce controls promised in their documentation

To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a zone, BIND 9 provides a feature called update-policy. Various rules can be configured to limit the types of updates that can be performed by a client, depending on the key used when sending the update request. Unfortunately, some rule types were not initially documented, and when documentation for them was added to the Administrator Reference Manual (ARM) in change #3112, the language that was added to the ARM at that time incorrectly described the behavior of two rule types, krb5-subdomain and ms-subdomain. This incorrect documentation could mislead operators into believing that policies they had configured were more restrictive than they actually were. This affects BIND versions prior to BIND 9.11.5 and BIND 9.12.3.

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ISC BIND 安全特征问题漏洞

ISC BIND是美国Internet Systems Consortium（ISC）公司所维护的一套实现了DNS协议的开源软件。 ISC BIND 9.11.5之前版本和9.12.3之前版本中存在安全绕过漏洞。远程攻击者可利用该漏洞修改目标系统上的数据。

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