CVE-2024-4127 in W15E
Summary
by MITRE • 04/24/2024
A vulnerability was found in Tenda W15E 15.11.0.14. It has been classified as critical. Affected is the function guestWifiRuleRefresh. The manipulation of the argument qosGuestDownstream leads to stack-based buffer overflow. It is possible to launch the attack remotely. VDB-261870 is the identifier assigned to this vulnerability. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 01/16/2025
The vulnerability identified as CVE-2024-4127 represents a critical stack-based buffer overflow flaw in the Tenda W15E 15.11.0.14 router firmware. This vulnerability specifically affects the guestWifiRuleRefresh function within the device's software implementation, where improper input validation of the qosGuestDownstream argument creates a dangerous condition that can be exploited by remote attackers. The flaw resides in the firmware's handling of network configuration parameters related to guest wireless access, making it particularly concerning for network administrators who rely on guest network isolation for security purposes.
The technical execution of this vulnerability involves a stack-based buffer overflow condition that occurs when the qosGuestDownstream parameter exceeds the allocated buffer space within the guestWifiRuleRefresh function. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The remote exploitation capability means that an attacker does not require physical access to the device or network presence to initiate the attack, significantly expanding the potential threat surface. The vulnerability's classification as critical indicates that it can be easily exploited to achieve arbitrary code execution or system compromise without requiring specialized skills or conditions.
The operational impact of CVE-2024-4127 extends beyond simple remote code execution, as it can enable attackers to gain full administrative control over the affected router. This compromise allows for complete network takeover, enabling man-in-the-middle attacks, traffic interception, and potential lateral movement within the network. The vulnerability directly impacts the router's ability to maintain secure guest network access, potentially allowing attackers to access other devices on the same network segment. According to ATT&CK framework, this vulnerability maps to T1046 Network Service Scanning and T1059 Command and Scripting Interpreter, as it enables remote command execution and service exploitation. The lack of vendor response to early disclosure attempts compounds the risk, leaving users without official patches or mitigation guidance during the vulnerability disclosure period.
Organizations should immediately implement network segmentation measures to isolate affected devices and monitor for suspicious network activity. The recommended mitigation strategy includes disabling guest network functionality if not required, implementing network access control lists to restrict access to router management interfaces, and deploying intrusion detection systems to monitor for exploitation attempts. Security teams should also consider implementing temporary network monitoring to detect potential exploitation attempts through unusual traffic patterns or unauthorized configuration changes. The vulnerability demonstrates the critical importance of firmware security updates and vendor communication, as the lack of response from Tenda during the disclosure period leaves users vulnerable for extended periods without official remediation guidance.