12/7/2023 0 Comments Matlab log4jAdditionally, Secrets Manager easily allows the rotation of credentials much more frequently. Secrets Manager addresses the issue around storing passwords and credentials in cleartext within your application and configuration files. One very powerful service is Secrets Manager. What’s great about running your workloads on EC2, is that AWS provides several additional layers of protection available right at your fingertips. For AWS EC2 Workloads, Follow These Additional Log4j Protective Practices Web Application Firewalls commonly protect against other malicious content such as SQL injection attacks and DDoS attempts. You could construct a rule that defines valid User-Agent strings accepted by your application, and drop all other traffic that doesn’t match. Barracuda Networks’ Web Application Firewall is an example of a flexible WAF. The User-Agent header is a common mechanism that transports the Log4Shell vulnerability. Web Application Firewalls on the other hand, inspect HTTP traffic inbound to your servers. Web content filters inspect outbound HTTP traffic. By implementing a web content filter for your servers, you eliminate one vector by which malicious code can be delivered. In fact, it may be easier to construct this type of policy, since your servers will likely only reach out to a few discrete websites – Ubuntu package repositories or Microsoft downloads, for example. Solutions like these could extend to your server fleet as well. For example, perhaps there are policies in place that prevent access to sites that contain inappropriate content. Many enterprises utilize a web content filter to limit user’s web traffic. After the geoblocking, we were able to reduce these attempts by 98%. Prior to the blocking, we saw daily occurrences of brute-force attempts into the servers. As a specific example, SPK enabled geoblocking for one of our customers who hosted several development and production servers which were internet facing and had port 22/SSH open to “any”. In this case, it makes sense to block internet traffic from all others. Utilize Geoblockingĭepending on your business, it may be clear that there are only a small number of countries from which you legitimately have customers originate. By restricting outbound network traffic at least by port, your applications won’t be able to reach out to random endpoints on the internet over ports 389 for example. The content instructs the target server application to reach outbound to the malicious address, and to fetch some malicious code. The vulnerable server logs the malicious payload, and parses its content. Implement Outbound Traffic RestrictionsĪt a basic level, the Log4j vulnerability relies on a mechanism whereby a malicious address is injected into an HTTP header to a target server. The following 5 best practices potentially could have protected you from the Log4Shell vulnerability as well as the “next big one” coming in the future. What we can do immediately is protect our existing environments. What’s next however? Is the next critical vulnerability already making its way into the wild? We can’t know when exactly but we can be certain that it’s a matter of time before another application, networking device, or operating system is compromised. For those unable to patch their servers, mitigations are now available to harden specific applications. It allows hackers the ability to run malicious code (RCE – Remote Code Execution) on the vulnerable server.Īs of the date of this blog post, months have gone by, and patches to address the Log4Shell vulnerability have been released. This exploit was particularly harrowing due to the fact that the software library which it targeted is so widely utilized. On December 9, 2021, a critical exploit named “ Log4j” was disclosed to the world. SPK vCAD ™ - Virtual Engineering Platform
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