Remote Code Execution in Apache Struts Framework via OGNL Expression Injection
Apache Struts versions 2.5.30 through 2.5.32 contain a critical vulnerability allowing remote code execution through OGNL expression injection in the action message handling component. An unauthenticated attacker can execute arbitrary code by sending specially crafted HTTP requests containing malicious OGNL expressions.
This section explains the vulnerability in everyday language, so anyone can understand the risk and impact.
This is a serious security hole in Apache Struts, which is popular software used to build web applications. The vulnerability allows attackers to completely take over servers running vulnerable versions of Struts without needing any password or special access.
The problem occurs because Struts doesn't properly check certain types of web requests before processing them. An attacker can send a specially crafted request to a vulnerable website that tricks the server into running any commands the attacker wants. This could let them steal data, install malware, or cause other damage.
This is particularly dangerous because it can be exploited remotely over the internet without needing to log in first. Any organization using the affected versions of Apache Struts should update their software immediately.
Affected Products
Remediation
1. Upgrade Apache Struts to version 2.5.33 or later
2. If immediate upgrade is not possible, implement WAF rules to block requests containing OGNL expressions
3. Monitor for exploitation attempts in application logs
4. Review system for indicators of compromise if exploitation suspected