CVE-2012-0393 in Struts
Summary
by MITRE
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.
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Analysis
by VulDB Data Team • 12/05/2024
The vulnerability identified as CVE-2012-0393 represents a critical security flaw within the Apache Struts framework that existed in versions prior to 2.3.1.1. This issue resides within the ParameterInterceptor component, which serves as a core element responsible for handling parameter binding in web applications built on the Struts framework. The flaw stems from inadequate validation mechanisms that fail to properly restrict access to public constructors during parameter processing, creating a significant attack surface for malicious actors.
The technical exploitation of this vulnerability occurs through crafted parameter manipulation that leverages the framework's object creation mechanisms. When an attacker crafts a specially designed parameter, the ParameterInterceptor component processes this input without sufficient safeguards to prevent access to public constructors. This allows adversaries to instantiate Java objects with potentially malicious intent, enabling them to create or overwrite arbitrary files on the server filesystem. The vulnerability specifically targets the framework's ability to handle parameter binding in a secure manner, bypassing normal access controls that should prevent such unauthorized object instantiation.
The operational impact of CVE-2012-0393 extends far beyond simple privilege escalation, as it enables remote code execution capabilities through file manipulation. Attackers can leverage this vulnerability to write malicious files to the server, potentially including web shells or other malicious payloads that can be executed by the application server. The remote nature of this attack means that no authentication is required to exploit the vulnerability, making it particularly dangerous for web applications that are publicly accessible. This flaw directly relates to CWE-20, which describes improper input validation, and can be mapped to ATT&CK technique T1059.007 for remote code execution through web shell deployment.
The security implications of this vulnerability are severe and have been documented in numerous security advisories and penetration testing reports. Organizations running affected versions of Apache Struts are particularly vulnerable to attacks that can result in complete system compromise, data exfiltration, and persistent backdoor access. The vulnerability demonstrates a fundamental flaw in the framework's object instantiation security model, where parameter validation fails to properly sanitize input before allowing object creation. This type of vulnerability is particularly concerning because it can be exploited through standard web application attack vectors such as parameter manipulation in URL parameters or form submissions, making it accessible to attackers with minimal specialized knowledge.
Mitigation strategies for CVE-2012-0393 require immediate action to upgrade affected systems to Apache Struts version 2.3.1.1 or later, which includes patches addressing the parameter validation issues. Organizations should also implement comprehensive input validation at multiple layers of their application architecture, including application-level parameter sanitization and web application firewall rules that can detect and block suspicious parameter patterns. Additionally, security teams should conduct thorough vulnerability assessments to identify any systems running older versions of the framework and ensure proper patch management procedures are in place to prevent similar vulnerabilities from being introduced in the future. The remediation process should include monitoring for exploitation attempts and implementing network-level controls to limit access to vulnerable applications until full patching is completed.