CVE-2021-41040 in Wakaama
Summary
by MITRE • 02/01/2022
In Eclipse Wakaama, ever since its inception until 2021-01-14, the CoAP parsing code does not properly sanitize network-received data.
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Analysis
by VulDB Data Team • 02/04/2022
The vulnerability identified as CVE-2021-41040 affects Eclipse Wakaama, an open-source implementation of the Lightweight M2M (LWM2M) protocol used in IoT device management. This issue has existed since the project's inception until January 14, 2021, when it was addressed through code modifications. The fundamental problem lies in the CoAP (Constrained Application Protocol) parsing functionality that fails to adequately sanitize data received from network sources, creating a potential attack surface for malicious actors.
The technical flaw manifests in the improper handling of received CoAP messages where the parsing code does not validate or sanitize incoming network data before processing. This deficiency allows attackers to craft malicious CoAP packets that could exploit the lack of input validation, potentially leading to various security consequences including buffer overflows, memory corruption, or arbitrary code execution. The vulnerability represents a classic case of insufficient input sanitization that falls under CWE-20, which specifically addresses improper input validation in software systems. The CoAP protocol is designed for resource-constrained environments and relies heavily on predictable message formats, making proper data sanitization critical for maintaining system integrity.
From an operational perspective, this vulnerability poses significant risks to IoT deployments using Eclipse Wakaama as their LWM2M server implementation. Attackers could leverage this weakness to disrupt services, gain unauthorized access to device management functions, or potentially compromise the entire LWM2M ecosystem. The impact extends beyond simple denial-of-service scenarios as the vulnerability could enable more sophisticated attacks depending on how the parsed data is subsequently handled within the application. Organizations using this software in production environments would be particularly vulnerable since the flaw existed for years without detection, potentially allowing attackers to establish persistent access or cause widespread service disruption across connected IoT devices.
The mitigation strategy for CVE-2021-41040 involves implementing proper input validation and sanitization mechanisms within the CoAP parsing code. This includes validating message lengths, checking for malformed headers, and ensuring all received data conforms to expected formats before any processing occurs. Security patches should enforce strict bounds checking and implement defensive programming practices that align with the principles outlined in the ATT&CK framework's defense evasion techniques. Organizations should prioritize updating their Eclipse Wakaama installations to versions that include the fix, while also conducting thorough security assessments of their IoT infrastructure to identify any potential exploitation attempts. The vulnerability highlights the importance of continuous security monitoring and proper input validation in network-facing applications, particularly those operating in constrained environments where traditional security controls may be limited.