CVE-2007-3816 in JWIG
Summary
by MITRE
** DISPUTED ** JWIG might allow context-dependent attackers to cause a denial of service (service degradation) via loops of references to external templates. NOTE: this issue has been disputed by multiple third parties who state that only the application developer can trigger the issue, so no privilege boundaries are crossed. However, it seems possible that this is a vulnerability class to which an JWIG application may be vulnerable if template contents can be influenced, but this would be an issue in the application itself, not JWIG.
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Analysis
by VulDB Data Team • 01/17/2025
The vulnerability identified as CVE-2007-3816 pertains to the JWIG template processing system, which is a Java-based web application framework. This issue represents a potential denial of service condition that arises from improper handling of template reference loops. The vulnerability manifests when external templates contain circular references that create infinite loops during template processing, leading to service degradation or complete system unavailability. The nature of this vulnerability places it within the realm of application-level denial of service attacks where the system resources become consumed through recursive template processing.
The technical flaw in JWIG stems from inadequate loop detection mechanisms within the template engine's reference resolution system. When the framework encounters external template references that form circular dependencies, it fails to implement proper cycle detection algorithms. This absence allows attackers to craft malicious template content that creates reference loops, causing the template processor to enter infinite recursive calls. The vulnerability operates at the application level rather than affecting system-level components, making it particularly challenging to detect and prevent through traditional network security measures. This behavior aligns with CWE-838, which addresses insufficient control flow management in software systems where improper handling of recursive or iterative structures leads to resource exhaustion.
From an operational perspective, the impact of this vulnerability depends heavily on the environment in which JWIG is deployed and the ability of attackers to influence template content. While the vulnerability has been disputed by third parties who argue that only application developers can trigger it due to privilege boundary considerations, the potential exists for scenarios where external input can influence template processing. The disputed nature of this vulnerability suggests that it may not represent a direct security flaw in the JWIG framework itself but rather an application design weakness that could be exploited in certain configurations. However, the possibility remains that if template contents can be manipulated by untrusted users, the framework becomes susceptible to this class of denial of service attacks.
The mitigation strategies for this vulnerability primarily focus on application-level hardening and proper template management practices. Developers should implement comprehensive input validation and sanitization for all template content, particularly when external or user-provided templates are involved. The implementation of maximum recursion limits and cycle detection mechanisms within template processing engines would provide effective protection against infinite loop scenarios. Additionally, proper template access controls and privilege separation should be enforced to prevent unauthorized template modifications that could lead to exploitation. Organizations should also consider implementing monitoring and alerting mechanisms to detect unusual template processing patterns that might indicate attempted exploitation. This vulnerability class demonstrates the importance of defensive programming practices and the need for robust error handling in template engines, aligning with ATT&CK technique T1499.004 for resource exhaustion attacks targeting application components. The disputed nature of this vulnerability highlights the complexity of determining true security boundaries in application frameworks where the line between framework limitations and application design choices can become blurred.