Hi Dragan,
Thanks a lot for your question.
We are working on a reliable way to test this to our satisfaction. Initial examination suggests that https://log4shell.huntress.com/ may be a good way to perform such a test, though it's provided by a third party which we can't ourselves vouch for.
You can also have a look at the recent statement from ElasticSearch: https://discuss.elastic.co/t/apache-log4j2-remote-code-execution-rce-vulnerability-cve-2021-44228-esa-2021-31/291476
I hope this helps a little bit!

On Tue, 14 Dec 2021 at 16:46, Dragan Espenschied <dragan.espenschied@rhizome.org> wrote:
Thank you Lea!
Is there a recommended way for testing if the configuration is effective and the lookup is indeed disabled?
Yours,
Dragan

On Tue, Dec 14, 2021 at 3:00 PM Léa Lacroix <lea.lacroix@wikimedia.de> wrote:
Hello all,

Here's an important security message from the Wikibase development team. 

We are aware of the vulnerability in log4j announced on December 9, 2021: CVE-2021-44228 [1] aka log4shell [2]. In our Wikibase Docker install, the only piece of software affected by this vulnerability is the version of Elasticsearch we currently use, 6.5.4. This is an older version of Elasticsearch. For now, users of the wikibase-release-pipeline Docker images should circumvent this vulnerability by disabling log4j lookups.

To circumvent the vulnerability, you can add the following Java option to the ES_JAVA_OPTS variable specified in your docker-compose(-extra).yml file and restart your Docker images:

 -Dlog4j2.formatMsgNoLookups=true

This patch is also available on our github mirror [3].

Going forward we will carefully vet any new software or new versions of existing software to ensure the log4shell vulnerability is not present.

Feel free to respond here or on our questions page [4] with any questions or concerns. Thanks for your attention. This announcement is also available as a web page here [5].

Best regards,
Léa Lacroix

[1] https://www.cve.org/CVERecord?id=CVE-2021-44228

[2] https://en.wikipedia.org/wiki/Log4Shell

[3] https://github.com/wmde/wikibase-release-pipeline/commit/6b1342e94b1d75df1035d87d20c6e1eff47c340e

[4] https://www.mediawiki.org/wiki/Talk:Wikibase/FAQ?dtenable=1

[5] https://www.mediawiki.org/wiki/Wikibase/Announcements/2021-12-14

--
Léa Lacroix
Community Engagement Coordinator

Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de

Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.

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-- 
Dragan Espenschied
Preservation Director
Rhizome at the New Museum
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--
Léa Lacroix
Community Engagement Coordinator

Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de

Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.

Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das Finanzamt für Körperschaften I Berlin, Steuernummer 27/029/42207.