Log4Shell, four years later: the lesson everyone said they learned and nobody did
Log4Shell (CVE-2021-44228, December 2021) is old news, but I keep seeing the same mistakes it should have cured, so here is the short version and what it was actually about. what happened Log4j is a Java logging library that is inside an enormous amount of the world's software. it had a feature where a logged string could trigger a lookup, and an attacker who could get a crafted string logged (a username, a user…