You should still update your Apache systems to permanently remediate the vulnerability, but patching takes time, and some systems may not be able to be updated immediately-or at all. Take action now to implement this vaccine and protect your Apache servers from this critical vulnerability. There are already tools developed to automatically attempt to exploit the bug. Organizations and security professionals are scrambling to update Log4j to patch the bug, while attackers are actively scanning the internet for affected systems. The simplest solution is to set up a server that will download and then run a class that changes the server’s configuration to not load things anymore. You can permanently close the vulnerability by causing the server to save a configuration file, but that is a more difficult proposition. Because the vulnerability is so easy to exploit and so ubiquitous-it’s one of the very few ways to close it in certain scenarios. In short, the fix uses the vulnerability itself to set the flag that turns it off. Logout4Shell is a vaccine to protect against exploits targeting the Log4Shell flaw: For systems that can’t be updated (or at least not updated immediately) Cybereason researchers have discovered a way to disable the vulnerability. We recommend patching affected systems as soon as possible. CYBEREASON LOGOUT4SHELL VACCINE ON GITHUB At that point, the exploit will allow the attacker to load arbitrary Java code and take control of the server. An attacker can exploit the vulnerability by simply sending a malicious code string that gets logged by Log4j. Browser search bars are also often logged and expose systems to this flaw.Įxploiting the flaw is fairly trivial. Most login screens in the world typically audit failed login attempts, meaning that virtually every authenticated page using Log4j is vulnerable. The vulnerability can allow threat actors to take control of any Java-based, internet-facing server and engage in remote code execution (RCE) attacks. Log4j is an open source Java logging library that is widely used in a range of software applications and services around the world. Apache is pervasive and comprises nearly a third of all web servers in the world-making this a potentially catastrophic flaw. The flaw has been dubbed “Log4Shell,” and has the highest possible severity rating of 10. APACHE LOG4SHELL ZERO DAY BACKGROUNDĪ vulnerability impacting Apache Log4j versions 2.0 through 2.14.1 was disclosed on the project’s GitHub on December 9, 2021. Cybereason previously announced that none of the company’s products or services were impacted by the vulnerability. It is a relatively simple fix that requires only basic Java skills to implement and is freely available to any organization. The vaccine is now freely available on GitHub. ![]() Cybereason researchers have developed and released a “vaccine” for the Apache Log4Shell vulnerability ( CVE-2021-44228).
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