CVE-2012-4572 in JBoss Enterprise Application Platform
Summary
by MITRE
Red Hat JBoss Enterprise Application Platform (EAP) before 6.1.0 and JBoss Portal before 6.1.0 does not load the implementation of a custom authorization module for a new application when an implementation is already loaded and the modules share class names, which allows local users to control certain applications authorization decisions via a crafted application.
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Analysis
by VulDB Data Team • 05/11/2021
The vulnerability described in CVE-2012-4572 represents a critical class loading issue within Red Hat JBoss Enterprise Application Platform and JBoss Portal versions prior to 6.1.0. This flaw stems from improper handling of custom authorization modules within the application server's class loading mechanism, creating a security boundary that can be exploited by local attackers to manipulate authorization decisions for applications running on the platform. The vulnerability specifically manifests when multiple authorization module implementations share identical class names, a scenario that commonly occurs in enterprise environments where custom security modules are developed and deployed alongside existing platform components.
The technical root cause of this vulnerability lies in the class loading behavior of the JBoss application server's security framework. When a custom authorization module is first loaded, the server establishes a class loader context that caches the module implementation. Subsequently, when a new application attempts to load a similar authorization module with overlapping class names, the system fails to properly isolate these implementations, instead reusing the already loaded version. This class loading inconsistency creates a scenario where local users can craft malicious applications that manipulate the authorization decision-making process by exploiting the shared class name conflict. The vulnerability is particularly dangerous because it operates at the class loading level, making it difficult to detect through traditional security scanning methods and requiring deep understanding of the application server's internal mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the authorization integrity of applications running on affected JBoss platforms. Local attackers with access to the system can potentially bypass security controls for applications that rely on custom authorization modules, leading to unauthorized access to sensitive data, system resources, and application functionality. This vulnerability affects the core security architecture of the application server, potentially allowing attackers to gain elevated privileges within applications that should be protected by custom authorization logic. The implications are particularly severe in enterprise environments where multiple applications share the same platform and rely on granular security controls to maintain data isolation and access restrictions. The vulnerability also impacts the principle of least privilege, as it allows attackers to manipulate authorization decisions that should be enforced by the platform's security subsystem rather than being controlled by the application developers or security administrators.
Mitigation strategies for CVE-2012-4572 should focus on immediate platform upgrades to JBoss EAP 6.1.0 and JBoss Portal 6.1.0, which contain the necessary fixes for the class loading behavior. Organizations should also implement strict application deployment policies that prevent the loading of custom authorization modules with overlapping class names, and consider implementing additional security controls such as runtime application monitoring and class loader isolation techniques. Security teams should conduct comprehensive audits of existing custom authorization modules to identify potential conflicts and ensure that proper class loading isolation is maintained. The vulnerability aligns with CWE-254 in the CWE Top 25, which addresses security weaknesses in class loading and object instantiation, and represents a significant concern from ATT&CK framework perspective under the Privilege Escalation and Defense Evasion tactics. Organizations should also consider implementing application whitelisting policies and monitoring for unusual class loading patterns that could indicate exploitation attempts. The fix implemented in the patched versions addresses the underlying class loader behavior by ensuring proper isolation between different authorization module implementations, preventing the reuse of cached class definitions when new applications require distinct security controls.