Apache’s Fix for Log4Shell Can Lead to DoS Attacks

Not only is the jaw-dropping flaw in the Apache Log4j logging library ubiquitous; Apache’s blanket of a quickly baked patch for Log4Shell also has holes.

As if finding one easily-exploited and extremely dangerous flaw in the ubiquitous Java logging library Apache Log4j hadn’t already turned the Internet security community on its ear, researchers now have found a new vulnerability in Apache’s patch issued to mitigate it.

Last Thursday security researchers began warning that a vulnerability tracked as CVE-2021-44228 in Apache Log4j was under active attack and had the potential, according to many reports, to break the internet. Dubbed Log4Shell by LunaSec, the flaw resides in the broadly deployed Java logging library and is a remote code execution (RCE) bug that’s simple to exploit in many services and products.

A barrage of attackers immediately set upon Log4Shell, initially to unleash malicious code on either servers or clients running the Java version of Minecraft by manipulating log messages, including from text typed into chat messages. Then attackers began to branch out, spawning 60 or more bigger mutations of the original exploit in one day.

To its credit, Apache hastily released a patch to fix Log4Shell with Log4j

Read More: https://threatpost.com/apache-patch-log4shell-log4j-dos-attacks/177064/