named configured to answer from stale cache may terminate unexpectedly at recursive-clients soft quota

This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero. If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A

ISC BIND 安全漏洞

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 BIND 9.16.0版本至9.16.36版本、9.18.0版本至9.18.10版本、9.19.0版本至9.19.8版本存在安全漏洞，该漏洞源于如果解析器收到很多需要递归的查询，那么等待递归完成的客户端数量就会相应增加，如果在接收到新客户端查询时已经有足够多的客户端在等待，可能会发生竞争导致断言失败。

N/A

其他