CVE-2013-6325 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere Application Server 7.x before 7.0.0.31, 8.0.x before 8.0.0.8, and 8.5.x before 8.5.5.2 allows remote attackers to cause a denial of service (resource consumption) via a crafted request to a web services endpoint.
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Analysis
by VulDB Data Team • 06/08/2021
IBM WebSphere Application Server versions 7.x before 7.0.0.31, 8.0.x before 8.0.0.8, and 8.5.x before 8.5.5.2 contain a vulnerability that enables remote attackers to trigger resource consumption denial of service conditions through specially crafted requests to web services endpoints. This vulnerability falls under the category of resource exhaustion attacks where malicious input causes the application server to consume excessive system resources such as memory, CPU cycles, or file descriptors, ultimately leading to service unavailability. The flaw specifically targets the web services processing functionality within the application server, making it particularly dangerous as it can affect critical business applications that rely on web services communication. Attackers can exploit this vulnerability by sending malformed or crafted requests that cause the server to enter an infinite loop or consume disproportionate amounts of computational resources during request processing. The vulnerability represents a classic example of insufficient resource management where the server fails to properly validate or limit the resources consumed during web services request handling, leading to a denial of service condition that can be triggered remotely without authentication requirements. This weakness aligns with CWE-400, which specifically addresses uncontrolled resource consumption, and demonstrates how improper input validation can lead to system instability and service disruption.
The technical implementation of this vulnerability involves the application server's web services endpoint failing to properly handle malformed requests or requests containing excessive data structures that cause the underlying processing logic to consume resources in an unbounded manner. When a crafted request reaches the web services endpoint, the server's processing mechanisms attempt to parse or validate the input, but due to inadequate bounds checking or resource allocation controls, the processing consumes increasing amounts of system resources over time. This can manifest as memory leaks, CPU saturation, or file descriptor exhaustion depending on how the server's internal resource management handles the malformed input. The vulnerability is particularly concerning because web services endpoints are commonly exposed to external traffic and are often integral to business applications, making them prime targets for exploitation. The attack can be executed through various means including malformed SOAP requests, excessive parameter values, or specially crafted XML content that triggers the server's web services processing logic to consume resources in an uncontrolled fashion. The resource consumption patterns typically follow predictable sequences where the server's performance degrades progressively until the system becomes unresponsive or crashes entirely, depending on the specific implementation and resource constraints of the affected system.
The operational impact of this vulnerability extends beyond simple service disruption to potentially affect business continuity and system availability for organizations relying on IBM WebSphere Application Server for their web services infrastructure. When exploited, the vulnerability can cause cascading failures throughout the application stack, as the resource exhaustion affects not only the specific web services endpoint but can also impact other services running on the same server instance. Organizations may experience increased system monitoring alerts, degraded performance for legitimate users, and potential service outages that can have significant financial and operational consequences. The vulnerability's remote exploitability means that attackers can target systems without requiring physical access or local credentials, making it particularly dangerous in environments where web services are exposed to untrusted networks. Additionally, the vulnerability can be exploited as part of larger attack campaigns where attackers use resource exhaustion techniques to prepare for more sophisticated attacks or to disrupt business operations for extended periods. The impact is further amplified in cloud or containerized environments where resource limits are shared among multiple applications, potentially causing broader system instability. This vulnerability directly relates to ATT&CK technique T1499.004 which covers resource exhaustion attacks and demonstrates how seemingly minor implementation flaws can lead to significant operational disruptions in enterprise computing environments.
Organizations affected by this vulnerability should prioritize immediate patching of their IBM WebSphere Application Server installations to the recommended versions that contain the necessary security fixes. The patches provided by IBM address the root cause by implementing proper bounds checking and resource management controls within the web services processing logic to prevent uncontrolled resource consumption. System administrators should also implement network-level mitigations such as rate limiting, request size restrictions, and intrusion detection systems to monitor for suspicious traffic patterns that may indicate exploitation attempts. Additionally, organizations should conduct thorough testing of the patches in staging environments before deployment to ensure compatibility with existing applications and avoid unintended service disruptions. Security monitoring should be enhanced to detect unusual resource consumption patterns or spikes in web services endpoint activity that may indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing proper input validation controls throughout application infrastructure. Regular vulnerability assessments and security audits should be conducted to identify similar resource management issues in other components of the application stack, as this type of vulnerability often indicates broader architectural weaknesses in resource handling and validation mechanisms. Organizations should also consider implementing web application firewalls and API gateways to provide additional layers of protection for their web services endpoints, creating a defense-in-depth approach to protect against resource exhaustion attacks and other related threats.