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

[Petr Špaček]

On 02. 10. 23 11:06, Kurt Jaeger wrote:
> 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/

It's impossible to judge from the (lack of) details provided. Sorry!

-- 
Petr Špaček
Internet Systems Consortium