Apache Struts 2 - DefaultActionMapper Prefixes OGNL Code Execution

Remote Code Evaluation will result in the entire web application and web server being compromised.Here RCE is performed over Apache Struts 2 . Remote attackers can execute arbitrary OGNL expressions through a parameter with a crafted (1) action:, (2) redirect:, or (3) redirectAction: prefix in Apache Struts 2.0.0 through 2.3.15.

Impact

A lot of information disclosure can happen.The credibility of the system has been completely compromised.The entire system is compromised as a result of a total lack of system security.The affected resource has been fully shut down.The intruder has the ability to make the resource entirely unusable.

Mitigation / Precaution

In order to patch this vulnerability, please install the official patch Apache Struts 2 made available for supported, vulnerable instances.

Written by

Sooraj V Nair

Cyber Security Engineer

Sooraj was probably the kid who opened up a remote control just to see what was inside, then had to figure out how to put it back together before anyone noticed. That curiosity eventually found its way into cybersecurity, where breaking things is actually part of the job description. Today, he explores vulnerabilities, analysis threats, and helps build safer digital spaces. His favourite question remains the same: “What happens if I try this?”