[exim] Re: Recent CVEs and libspf2 (and Debian)

> Dear Exim users,
>
> while the recent CVEs addressed some issues that existed in Exim, there
> seems to be at least one issue that is related to a library we
> potentially use.
>
> ZDI-23-1472 | ZDI-CAN-17578 | CVE-2023-42118 | Exim Bug 3032
>
> - https://bugs.exim.org/show_bug.cgi?id=3032
> - https://www.zerodayinitiative.com/advisories/ZDI-23-1472/
>
> Unfortunately we do not have any further details. But the libspf2 repo
> on Github https://github.com/shevek/libspf2 contains at least one pull
> request that potentially addresses the issue: https://github.com/shevek/libspf2/pull/44
>
> IMHO a CVE should be created for that issue. Or the CVE-2023-42118
> should be re-assigned to the libspf2.
>
> So, if you do not want to disable the `spf` condition and `spf`
> lookups in your Exim configuration, you could try to use a patched
> version of the libspf2 library.
>
> Dear Debian users: currently it doesn't seem as Debian provides a
> patched version (because of the above mentioned uncertainty).
>
> To patch my own systems built a libspf2 package containing the patch.
> This package is *not officially supported*! Use it on your own risk. And
> I do not promise any maintenance, updates, functionality, compatibility.
> You're on your own using it. Please do not complain, if it breaks your
> systems. But I'm happy about feedback.
>
> - Git repo for `gbp`: https://gitea.schlittermann.de/DEB/libspf2
> - Packages: https://apt.schlittermann.de/pool/main/libs/libspf2/
>
> Hopefully this private hotfix will be outdated by official packages as soon as
> possible.
>
>      Best regards from Dresden/Germany
>      Viele Grüße aus Dresden
>      Heiko Schlittermann
> --
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>