Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2025-40777: If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain involving a specific combination of cached or authoritative records, the daemon will abort with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.10, 9.21.0 through 9.21.9, and 9.20.9-S1 through 9.20.10-S1.
Fixed packages 13
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | bind | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-chroot | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-debuginfo | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-debugsource | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-devel | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-dnssec-utils | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-dnssec-utils-debuginfo | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-doc | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-libs | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-libs-debuginfo | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-license | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-utils | 32:9.18.33-1.amzn2023.0.3 |
| Amazon Linux · 2023 | bind-utils-debuginfo | 32:9.18.33-1.amzn2023.0.3 |
Vulnerabilities 1
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High 7.5
A possible assertion failure when 'stale-answer-client-timeout' is set to '0'
If a `named` caching resolver is configured with `serve-stale-enable` `yes`, and with `stale-answer-client-timeout` set to `0` (the only allowable value other than `disabled`), and if the resolver, in the process of resolving a query, encounters a CNAME chain…
References
-
web
https://alas.aws.amazon.com/cve/html/CVE-2025-40777.html