The ParameterInterceptor component in Apache Struts before 18.104.22.168 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.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification; Allows disruption of service
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20120105 SEC Consult SA-20120104-0 :: Multiple critical vulnerabilities in Apache Struts2