Apache Struts2 S2-001 RCE

Jijith Rajan

Published on

16 Jun 2021

Vulnerability

Apache Struts is an open-source project of the Apache Software Foundation in the United States. Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via form input beginning with a “%{“ sequence and ending with a “}” character.

Mitigation / Precaution

We recommend you to upgrade Apache Struts to the latest version.

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