CVE-2023-2686 in GSDK
Summary
by MITRE • 06/15/2023
Buffer overflow in Wi-Fi Commissioning MicriumOS example in Silicon Labs Gecko SDK v4.2.3 or earlier allows connected device to write payload onto the stack.
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Analysis
by VulDB Data Team • 06/16/2023
The vulnerability identified as CVE-2023-2686 represents a critical buffer overflow condition within the Wi-Fi Commissioning functionality of MicriumOS example implementations in Silicon Labs Gecko SDK versions 4.2.3 and earlier. This flaw exists within the embedded operating system component that handles wireless network commissioning processes, creating a pathway for malicious actors to exploit memory management weaknesses in connected IoT devices. The vulnerability specifically targets the stack memory region where incoming payload data is processed during Wi-Fi commissioning operations, allowing an attacker to overflow the allocated buffer space and potentially overwrite adjacent memory locations.
The technical implementation of this vulnerability stems from inadequate input validation and bounds checking within the Wi-Fi commissioning example code provided by Silicon Labs. When a connected device receives a specially crafted payload during the commissioning process, the system fails to properly validate the size of incoming data before copying it into a fixed-size buffer allocated on the stack. This classic buffer overflow scenario occurs because the code does not implement proper size checks or sanitization routines before accepting and processing external network data. The flaw falls under the CWE-121 buffer overflow category, specifically manifesting as a stack-based buffer overflow that can lead to arbitrary code execution or system instability.
The operational impact of this vulnerability extends significantly within IoT ecosystems that utilize Silicon Labs Gecko SDK implementations, particularly affecting devices that rely on Wi-Fi commissioning for network configuration and management. Attackers who can establish communication with vulnerable devices can potentially execute arbitrary code on the target system, leading to complete compromise of the device's functionality. This includes unauthorized access to network credentials, data exfiltration, and potential use of compromised devices as entry points for broader network infiltration. The vulnerability is particularly concerning because it affects the commissioning process itself, which is typically a trusted operation within IoT deployments, making exploitation more likely and less detectable.
Mitigation strategies for CVE-2023-2686 require immediate attention from device manufacturers and system administrators. The primary recommendation involves upgrading to Silicon Labs Gecko SDK versions that contain patches addressing this buffer overflow vulnerability, specifically targeting releases beyond version 4.2.3. Organizations should implement network segmentation and access controls to limit communication with vulnerable devices, while also monitoring for unusual network traffic patterns that might indicate exploitation attempts. Additional defensive measures include implementing input validation at multiple layers of the network stack, employing stack protection mechanisms such as stack canaries, and conducting thorough code reviews to identify similar buffer overflow patterns in other components of the system. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage, as exploitation may involve executing malicious payloads through compromised commissioning interfaces.