The Apache Software Foundation has released an advisory to address a vulnerable commons-fileupload library used in Apache Struts versions 2.3.36 and prior. A remote attacker could exploit this vulnerability to take control of an affected system. Struts versions from 2.5.12 are not affected.
By exploiting this vulnerability, it is possible to perform a Remote Code Execution (RCE) attack.
- Struts 2.3.36 and prior
Recommended Course of Action
Upgrade to the latest released version of Commons FileUpload library, which is currently 1.3.3. Deployed applications can be hardened by replacing the commons-fileupload jar file in WEB-INF/lib with the fixed jar. For Maven based Struts 2 projects, the following dependency needs to be added:
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency>