[slf4j-user] Slf4j shields from Log4shell via log4j2.formatMsgNoLookups=true

David Smiley dsmiley at apache.org
Wed Dec 22 22:24:13 CET 2021


Hello Slf4j community,

I'd like to share a happy discovery about the well-known "Log4shell"
vulnerability on Log4j2.  Apps that use Slf4j with Log4j2 backing (and
which don't otherwise call Log4j2 directly) can be mitigated
by log4j2.formatMsgNoLookups=true

https://lists.apache.org/thread/kgh63sncrsm2bls884pg87mnt8vqztmz

As I write this (with Ralph having yet to respond to my follow-up), it's
not really some final determination but it's highly encouraging.

~ David Smiley
Apache Lucene/Solr Search Developer
http://www.linkedin.com/in/davidwsmiley
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