AWS Security Blog
Open source hotpatch for Apache Log4j vulnerability
December 14, 2021:The version 2.15 Log4j was updated to the new version out today.
At Amazon Web Services (AWS), security remains our top priority. As we addressed the Apache Log4j vulnerability this weekend, I’m pleased to note that our team created and released a hotpatch as an interim mitigation step. This tool may help you mitigate the risk when updating is not immediately possible.
It’s important that you review, patch, or mitigate this vulnerability as soon as possible. We still recommend that you update Log4j to the latest version as a mitigation, but we know that can take some time, depending on your resources. To take immediate action, we recommend that you implement this newly created tool to hotpatch your Log4j deployments. A huge thanks to the Amazon Corretto team for spending days, nights, and the weekend to write, harden, and ship this code. This tool is available now at GitHub.
As with all open source software, you’re using this at your own risk. Note that the hotpatch has been tested with JDK8 and JDK11 on Linux. On JDK17, only the static agent mode works. A full list of caveats can be found in the README.
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