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CVE-2022-3924— named configured to answer from stale cache may terminate unexpectedly at recursive-clients soft quota

Quick assessment

Affected
ISC BIND 9
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 16.11% · P97
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I. Basic Information for CVE-2022-3924

Vulnerability Information
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Vulnerability Title
named configured to answer from stale cache may terminate unexpectedly at recursive-clients soft quota
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.16.12 ~ 9.16.36 -

II. Public POCs for CVE-2022-3924

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III. Intelligence Information for CVE-2022-3924

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Other References for CVE-2022-3924 (1)

Same Patch Batch · ISC · 2023-01-25 · 4 CVEs total

CVE-2022-3736 7.5 HIGH named configured to answer from stale cache may terminate unexpectedly while processing RR
CVE-2022-3488 7.5 HIGH named may terminate unexpectedly when processing ECS options in repeated responses to iter
CVE-2022-3094 7.5 HIGH An UPDATE message flood may cause named to exhaust all available memory

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC

V. Comments for CVE-2022-3924

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