Is bind 9.18.19 a validating resolver to shield against CVE-2023-42119 ?

[Kurt Jaeger]

Hi!

In the light of the recent exim security issues[1,2]
I'm trying to find out if bind 9.18.19, if used as resolver,
does enough validation to shield exim instances from CVE-2023-42119 ?

As details and reproducers for the CVE are not available, this is a
more general question. Pointers on where I can read more about it
are highly appreciated!

There are probably two aspects to validation:
- Validating DNSSEC (the more common use case of validation)
- Validating DNS request/replies in general (bailiwick, cache polution etc).

[1] https://lists.exim.org/lurker/message/20231001.165119.aa8c29f9.en.html
[2] https://www.zerodayinitiative.com/advisories/ZDI-23-1473/

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pi at opsec.eu            +49 171 3101372                    Now what ?