CVE-2022-24026 in LinkHub Mesh Wi-Fi MS1G
Summary
by MITRE • 08/06/2022
A buffer overflow vulnerability exists in the GetValue functionality of TCL LinkHub Mesh Wi-Fi MS1G_00_01.00_14. A specially-crafted configuration value can lead to a buffer overflow. An attacker can modify a configuration value to trigger this vulnerability.This vulnerability represents all occurances of the buffer overflow vulnerability within the telnet_ate_monitor binary.
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Analysis
by VulDB Data Team • 08/31/2022
The buffer overflow vulnerability identified as CVE-2022-24026 affects TCL LinkHub Mesh Wi-Fi MS1G_00_01 devices, specifically within the GetValue functionality of the telnet_ate_monitor binary. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize configuration values before processing them within fixed-size memory buffers. The flaw manifests when an attacker crafts a malicious configuration value that exceeds the allocated buffer boundaries, potentially leading to memory corruption and arbitrary code execution. The vulnerability is particularly concerning as it exists within the telnet_ate_monitor binary, which suggests the issue may be present in network monitoring or administration components that handle remote configuration inputs.
The technical implementation of this vulnerability places the device at risk of unauthorized code execution through buffer overflow exploitation. When the GetValue function processes a malformed configuration parameter, it does not perform adequate bounds checking or size validation before copying data into memory buffers. This allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow or injecting malicious code. The vulnerability is classified as a classic buffer overflow according to CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent memory locations. The attack surface is expanded by the fact that this vulnerability affects the telnet_ate_monitor binary, indicating it may be accessible through telnet interfaces or similar remote management protocols.
Operationally, this vulnerability presents significant risks to network infrastructure security as it allows remote attackers to gain unauthorized access and potentially compromise the entire device. The ability to modify configuration values represents a critical attack vector that could enable privilege escalation, persistent backdoor installation, or denial of service conditions. An attacker exploiting this vulnerability could manipulate the device's operational parameters, potentially disrupting network services or establishing persistent access points within the mesh network. The impact extends beyond individual device compromise as mesh networks rely on interconnected devices, making this vulnerability particularly dangerous in enterprise or residential mesh network deployments where device compromise could affect multiple network segments. This aligns with ATT&CK technique T1059.005 for command and scripting interpreter, as the vulnerability could enable attackers to execute arbitrary commands through the compromised device.
Mitigation strategies for CVE-2022-24026 should prioritize immediate firmware updates from TCL to address the buffer overflow conditions within the telnet_ate_monitor binary. Network administrators must implement strict input validation measures and disable unnecessary telnet services where possible, preferring secure protocols like SSH for remote administration. Access controls should be tightened through network segmentation, firewall rules, and authentication mechanisms to limit exposure to potential attackers. The vulnerability requires patching at the firmware level as the buffer overflow exists within the binary itself, making runtime mitigations insufficient. Organizations should also implement monitoring for unusual configuration changes and establish baseline configurations to detect unauthorized modifications that could indicate exploitation attempts. Regular security assessments of network devices and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other network infrastructure components. The remediation process must include comprehensive testing to ensure that firmware updates do not introduce compatibility issues with existing network configurations while maintaining the security improvements necessary to protect against this specific buffer overflow vulnerability.