The ParameterInterceptor component in Apache Struts before 2.3.1.1 does not prevent access to public constructors, which allows remote attackers to create or overwrite arbitrary files via a crafted parameter that triggers the creation of a Java object.
archives.neohapsis.com/archives/bugtraq/2012-01/0031.html
struts.apache.org/2.x/docs/s2-008.html
struts.apache.org/2.x/docs/version-notes-2311.html
www.exploit-db.com/exploits/18329
github.com/apache/struts
github.com/apache/struts/commit/25e50069d60434a30395e3a98357ffba2bed427e
github.com/apache/struts/commit/9cad25f258bb2629d263f828574d2671366c238d
nvd.nist.gov/vuln/detail/CVE-2012-0393
web.archive.org/web/20120612142634/https://sec-consult.com/files/20120104-0_Apache_Struts2_Multiple_Critical_Vulnerabilities.txt
web.archive.org/web/20140723153720/secunia.com/advisories/47393