Apache Struts2 RCE

Jijith Rajan
Published on
16 Jun 2021

Apache Struts is a free and open-source framework used to build Java web applications. The use of Object Graph Navigation Language (OGNL) expressions in the Apache Struts smooth the way for attackers to execute arbitrary code remotely. On sending a malicious Content-Type, Content-Disposition, or Content-Length HTTP header with a Content-Type header containing a #cmd= string an incorrect exception handling and error message will be generated as the Jakarta Multipart parser fails to validate the file-upload attempts. This permits remote attackers to execute arbitrary commands on the vulnerable servers.

Mitigation / Precaution

  • We advise you to update Apache Struts installation to Struts 2.3.32 or Struts or above to fix this vulnerability.
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Written by
Jijith Rajan
Jijith Rajan
Cyber Security Engineer
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