CVE-2014-3285 in Wide Area Application Services
Summary
by MITRE
Cisco Wide Area Application Services (WAAS) 5.3(.5a) and earlier, when SharePoint acceleration is enabled, does not properly parse SharePoint responses, which allows remote attackers to cause a denial of service (application-optimization handler reload) via a crafted SharePoint application, aka Bug ID CSCue47674.
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Analysis
by VulDB Data Team • 03/22/2022
Cisco Wide Area Application Services WAAS version 5.3.5a and earlier contains a critical vulnerability in its application optimization handler that manifests when SharePoint acceleration is enabled. This vulnerability stems from improper parsing of SharePoint responses, creating a condition where maliciously crafted SharePoint applications can trigger an application-optimization handler reload. The flaw represents a classic buffer overflow or parsing error condition that falls under CWE-129, which encompasses improper validation of the length of input data. The vulnerability operates at the application layer and can be exploited remotely without authentication, making it particularly dangerous in enterprise environments where WAAS appliances are deployed to optimize network traffic between branch offices and data centers.
The technical exploitation of this vulnerability occurs when the WAAS appliance receives a malformed SharePoint response that it cannot properly parse. During the parsing process, the application-optimization handler attempts to process the malformed data and encounters an unexpected condition that triggers an automatic reload of the handler process. This reload operation causes a temporary disruption in service, effectively creating a denial of service condition that impacts the availability of the WAAS optimization services. The flaw demonstrates characteristics of CWE-121, which deals with stack-based buffer overflow conditions, though the exact mechanism likely involves heap-based memory corruption during response parsing. The vulnerability specifically affects the SharePoint acceleration feature, indicating that the issue is within the WAAS module responsible for optimizing Microsoft SharePoint traffic.
The operational impact of this vulnerability extends beyond simple service disruption, as it can compromise the entire WAAS infrastructure and potentially affect the optimization of other applications that rely on the same handler process. Organizations using WAAS for critical network optimization services may experience significant performance degradation or complete service outages when exploited. The vulnerability affects the core functionality of the WAAS appliance, which is designed to accelerate application traffic across wide area networks, making it a prime target for attackers seeking to disrupt business operations. From an attacker perspective, this vulnerability maps to ATT&CK technique T1499.004, which covers network denial of service attacks, and T1595.001, involving network infiltration through application layer attacks.
Organizations should immediately implement mitigations including disabling SharePoint acceleration on affected WAAS appliances until a patch is applied, monitoring for anomalous SharePoint traffic patterns, and implementing network segmentation to limit the potential impact of exploitation. The vulnerability highlights the importance of proper input validation and error handling in application optimization services, as outlined in the OWASP Top 10 security principles. Cisco has released patches addressing this vulnerability in later versions of WAAS, and organizations should prioritize upgrading to patched versions to eliminate the risk of exploitation. Additionally, implementing network monitoring solutions that can detect unusual handler reload patterns and automated response mechanisms can provide early warning of potential exploitation attempts. The vulnerability serves as a reminder of the critical need for robust input validation in enterprise optimization appliances and demonstrates how seemingly minor parsing flaws can have significant operational consequences in network infrastructure.