CVE-2014-2196 in Wide Area Application Services
Summary
by MITRE
Cisco Wide Area Application Services (WAAS) 5.1.1 before 5.1.1e, when SharePoint prefetch optimization is enabled, allows remote SharePoint servers to execute arbitrary code via a malformed response, aka Bug ID CSCue18479.
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Analysis
by VulDB Data Team • 03/21/2022
Cisco Wide Area Application Services WAAS version 5.1.1 before 5.1.1e contains a critical vulnerability that arises from insufficient input validation within the SharePoint prefetch optimization feature. This vulnerability exists when the WAAS appliance is configured to optimize SharePoint traffic, creating a potential attack vector for remote code execution. The flaw stems from the appliance's failure to properly validate response data received from SharePoint servers, specifically when these servers send malformed responses that exploit memory handling inconsistencies in the WAAS processing engine. When a remote SharePoint server sends a specially crafted response that triggers the prefetch optimization mechanism, the WAAS appliance processes this malformed data without adequate sanitization, allowing an attacker to inject and execute arbitrary code on the affected system.
The technical implementation of this vulnerability aligns with CWE-129, which addresses insufficient validation of length parameters, and CWE-787, concerning out-of-bounds write operations. The attack surface is particularly concerning because it leverages a legitimate network optimization feature that would typically be enabled in production environments where WAAS is deployed. The vulnerability operates through the WAAS appliance's SharePoint prefetch optimization mechanism, which is designed to improve performance by pre-fetching SharePoint resources. However, the implementation lacks proper bounds checking and input sanitization when processing responses from SharePoint servers, creating a path for attackers to manipulate the data flow and execute malicious payloads. This weakness enables attackers to gain unauthorized access to the WAAS appliance and potentially escalate privileges within the network infrastructure.
The operational impact of this vulnerability extends beyond simple remote code execution, as it provides attackers with a foothold in enterprise network environments where WAAS appliances are commonly deployed. WAAS appliances typically serve as critical network optimization devices that sit between data centers and branch offices, making them attractive targets for attackers seeking persistent access to enterprise networks. Once exploited, the vulnerability allows attackers to execute arbitrary commands with the privileges of the WAAS service account, which may include administrative access to the appliance itself and potentially access to network resources that the appliance optimizes. The attack requires minimal privileges from the remote SharePoint server and can be executed without user interaction, making it particularly dangerous in environments where SharePoint servers are accessible from untrusted networks.
Organizations should implement immediate mitigations including updating to Cisco WAAS version 5.1.1e or later, which contains patches addressing the input validation flaws in the SharePoint prefetch optimization feature. Network segmentation should be implemented to limit access to WAAS appliances from untrusted SharePoint servers, and firewall rules should be configured to restrict communication between WAAS appliances and SharePoint servers to only necessary ports and protocols. The vulnerability also highlights the importance of secure configuration management and regular security assessments of network optimization appliances. According to ATT&CK framework, this vulnerability maps to T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation, making it a significant concern for enterprise security teams. Additionally, organizations should consider implementing network monitoring solutions to detect anomalous traffic patterns that might indicate exploitation attempts, as the malicious responses could be difficult to distinguish from normal SharePoint traffic without proper detection mechanisms in place.