CVE-2022-24015 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 log_upload binary.
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Analysis
by VulDB Data Team • 08/31/2022
The CVE-2022-24015 vulnerability represents a critical buffer overflow flaw within the TCL LinkHub Mesh Wi-Fi MS1G_00_01 device firmware, specifically impacting the GetValue functionality of the log_upload binary component. This vulnerability exposes the device to potential exploitation through manipulation of configuration values, creating a pathway for attackers to execute arbitrary code or cause system instability. The flaw resides in how the device processes configuration inputs during log upload operations, where insufficient bounds checking allows maliciously crafted data to overwrite adjacent memory regions. The vulnerability is particularly concerning as it affects the core logging functionality that is essential for device operation and monitoring. The buffer overflow occurs when the system attempts to store a configuration value that exceeds the allocated buffer size, leading to memory corruption that can be leveraged for privilege escalation or denial of service attacks. This issue demonstrates poor input validation practices and highlights the importance of implementing proper memory management controls in embedded networking devices. The vulnerability affects all instances of the buffer overflow within the log_upload binary, suggesting a systemic flaw rather than an isolated incident. The impact extends beyond simple functionality degradation as it creates potential entry points for attackers to gain unauthorized access to the device's operational environment. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a significant risk to network security infrastructure. The affected device operates in a mesh networking environment where compromise of one node could potentially affect the entire network topology.
The technical implementation of this buffer overflow vulnerability stems from inadequate input sanitization within the GetValue function of the log_upload binary. When an attacker supplies a configuration value that exceeds the predetermined buffer limits, the system fails to properly validate the input length before copying data into memory. This allows the overflow to overwrite adjacent memory locations, potentially corrupting critical program data or even overwriting return addresses to redirect execution flow. The vulnerability is particularly dangerous because it operates at the configuration level, meaning that an attacker could manipulate device settings to trigger the overflow without requiring physical access or specialized tools. The device's logging mechanism serves as the attack vector, where legitimate configuration updates become opportunities for exploitation. The memory corruption resulting from this overflow could lead to unpredictable behavior including system crashes, arbitrary code execution, or complete device compromise. The vulnerability's presence in the log_upload binary indicates that the device's logging infrastructure has insufficient security controls, making it a prime target for attackers seeking to establish persistent access or disrupt network operations. This type of vulnerability is classified under ATT&CK technique T1059, which involves executing malicious code through command injection or memory corruption methods.
The operational impact of CVE-2022-24015 extends beyond immediate device compromise to encompass broader network security implications within mesh Wi-Fi environments. When exploited, this vulnerability enables attackers to gain unauthorized access to the device's configuration settings and potentially escalate privileges to execute commands with elevated system permissions. The vulnerability creates opportunities for attackers to perform man-in-the-middle attacks, intercept network traffic, or use the compromised device as a pivot point to target other network segments. Network administrators face significant challenges in detecting exploitation attempts since the vulnerability can be triggered through legitimate configuration updates, making malicious activity appear as normal operational behavior. The mesh networking topology exacerbates the risk as a compromised device can affect connectivity and security across the entire network infrastructure. Organizations deploying TCL LinkHub devices must consider the potential for lateral movement within their networks, as the compromised device could serve as a launching point for attacks against other connected systems. The vulnerability's impact is further amplified by the fact that it affects the logging functionality, potentially allowing attackers to cover their tracks by corrupting or manipulating log data. This creates a scenario where network monitoring systems may fail to detect malicious activity, leading to prolonged exposure and increased damage potential. The vulnerability demonstrates the critical need for robust input validation and memory safety practices in embedded systems, particularly those operating in security-sensitive environments.
Mitigation strategies for CVE-2022-24015 should focus on immediate firmware updates from TCL, as the vulnerability is likely addressed through patched versions of the log_upload binary. Network segmentation and access controls should be implemented to limit the potential impact of exploitation, particularly preventing unauthorized configuration changes to affected devices. Regular monitoring of device logs for unusual configuration modifications can help detect exploitation attempts before they escalate. Device administrators should disable unnecessary logging features and implement strict input validation for all configuration parameters. Network-based intrusion detection systems should be configured to monitor for patterns consistent with buffer overflow exploitation attempts. The vulnerability highlights the importance of secure coding practices and regular security assessments of embedded firmware components. Organizations should consider implementing device authentication mechanisms to prevent unauthorized configuration changes and establish baseline configurations that minimize attack surface. Regular security audits of network infrastructure should include evaluation of embedded device firmware for known vulnerabilities. The mitigation approach should also include establishing incident response procedures specifically designed to address device compromise scenarios, including procedures for isolating affected devices and restoring system integrity. Given the nature of the vulnerability, implementing network access controls and restricting administrative access to only trusted users becomes critical. The vulnerability serves as a reminder that even seemingly benign functionality like logging can represent significant security risks when not properly secured. Organizations should also consider implementing device firmware integrity checking mechanisms to detect unauthorized modifications that could introduce similar vulnerabilities. The remediation process should include comprehensive testing to ensure that the firmware update does not introduce compatibility issues with existing network configurations.