This post authored by Nick Biasini with contributions from Alex Chiu.

Earlier this week, a critical vulnerability in Apache Struts was publically disclosed in a security advisory. This new vulnerability, identified as CVE-2017-9805, manifests due to the way the REST plugin uses XStreamHandler with an instance of XStream for deserialization without any type filtering. As a result, a remote, unauthenticated attacker could achieve remote code execution on a host running a vulnerable version of Apache Struts.

This isn’t the only vulnerability that has been recently identified in Apache Struts. Earlier this year, Talos responded to a zero day vulnerability that was under active exploitation in the wild. Talos has observed exploitation activity targeting CVE-2017-9805 in a way that is similar to how CVE-2017-5638 was exploited back in March 2017.

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