CVE-2024-24543 in AC9
Summary
by MITRE • 02/05/2024
Buffer Overflow vulnerability in the function setSchedWifi in Tenda AC9 v.3.0, firmware version v.15.03.06.42_multi allows a remote attacker to cause a denial of service or run arbitrary code via crafted overflow data.
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Analysis
by VulDB Data Team • 02/29/2024
The buffer overflow vulnerability identified as CVE-2024-24543 resides within the setSchedWifi function of Tenda AC9 v.3.0 routers running firmware version v.15.03.06.42_multi. This critical flaw represents a classic stack-based buffer overflow condition that occurs when the device processes incoming data without proper bounds checking. The vulnerability manifests specifically during the handling of scheduled WiFi configuration parameters, where the system fails to validate the length of input data before copying it into a fixed-size buffer. Such a condition creates an exploitable entry point that allows remote attackers to manipulate memory layout and potentially execute arbitrary code on the affected device. The flaw falls under CWE-121, which categorizes stack-based buffer overflow conditions, and aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to gain unauthorized system access and execute malicious commands through the compromised device.
The operational impact of this vulnerability extends beyond simple denial of service to encompass full system compromise capabilities for skilled attackers. When exploited, the buffer overflow can cause the router to crash and reboot continuously, resulting in persistent denial of service that disrupts network connectivity for all connected devices. However, more sophisticated exploitation techniques could allow attackers to inject and execute malicious code within the router's memory space, potentially enabling them to establish persistent backdoors, redirect network traffic, or use the compromised device as a launch point for attacks against other networked systems. The remote nature of this vulnerability means attackers do not require physical access to the device, making it particularly dangerous in enterprise and residential networks where such devices are often deployed without adequate security monitoring. Network traffic analysis reveals that the vulnerable function processes HTTP requests containing scheduled WiFi parameters, making it accessible through standard web interface interactions.
Mitigation strategies for CVE-2024-24543 must address both immediate defensive measures and long-term architectural improvements to prevent similar vulnerabilities from emerging in future firmware releases. Organizations should prioritize immediate firmware updates from Tenda when available, as these patches typically include bounds checking mechanisms and input validation routines that prevent the buffer overflow condition from being exploited. Network segmentation and access control measures should be implemented to limit exposure of these devices to untrusted networks, while intrusion detection systems can monitor for unusual traffic patterns that might indicate exploitation attempts. Security hardening practices including disabling unnecessary services, implementing strong authentication mechanisms, and conducting regular vulnerability assessments help reduce the attack surface. The vulnerability also highlights the importance of secure coding practices and input validation in embedded systems, particularly in network infrastructure devices. Organizations should consider deploying network monitoring solutions that can detect anomalous behavior in network devices, including unexpected reboots or unusual traffic patterns that might indicate exploitation attempts. Regular security audits and penetration testing of network infrastructure devices can help identify similar vulnerabilities before they can be exploited by malicious actors.