CVE-2024-6962 in Tenda
Summary
by MITRE • 07/22/2024
A vulnerability classified as critical was found in Tenda O3 1.0.0.10. This vulnerability affects the function formQosSet. The manipulation of the argument remark/ipRange/upSpeed/downSpeed/enable leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-272116. 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 • 07/26/2024
The vulnerability identified as CVE-2024-6962 represents a critical stack-based buffer overflow flaw within the Tenda O3 1.0.0.10 firmware, specifically impacting the formQosSet function. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied parameters including remark, ipRange, upSpeed, downSpeed, and enable fields. The absence of proper bounds checking allows attackers to craft malicious inputs that exceed the allocated buffer space, leading to memory corruption and potential arbitrary code execution. The flaw exists within the Quality of Service configuration handling functionality, which is a core network management component of the router's web interface. Given that the attack vector is remote, this vulnerability presents an immediate threat to any device running the affected firmware version, as it does not require physical access or local network presence for exploitation.
The technical implementation of this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when data written to a stack buffer exceeds the buffer's capacity, overwriting adjacent memory locations. The attack surface is expanded by the fact that multiple parameters within the formQosSet function are susceptible to manipulation, providing attackers with multiple potential entry points. The stack overflow can potentially overwrite return addresses, function pointers, and other critical memory structures, enabling attackers to redirect program execution flow. This type of vulnerability is particularly dangerous in network devices as it can be exploited to gain unauthorized administrative access to the router, potentially allowing for complete network compromise. The public disclosure of this exploit means that threat actors can readily leverage this vulnerability without requiring advanced technical skills, significantly increasing the risk to affected systems.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can enable full system compromise and persistent access to the network infrastructure. An attacker who successfully exploits this vulnerability could potentially gain root access to the router, allowing them to modify network configurations, intercept traffic, establish backdoors, or use the device as a pivot point for further attacks within the network. The remote exploit capability means that attackers can target vulnerable devices from anywhere on the internet, making this vulnerability particularly concerning for enterprise networks and home users alike. Network administrators face the additional challenge that the vulnerability may remain undetected for extended periods, as the exploitation does not necessarily generate obvious network traffic patterns that would trigger traditional intrusion detection systems.
Mitigation strategies for CVE-2024-6962 should prioritize immediate firmware updates from Tenda if available, though the vendor's lack of response to early disclosure creates uncertainty about official patches. Network segmentation and firewall rules can help limit the attack surface by restricting access to the router's web interface from untrusted networks. Implementing network monitoring solutions that can detect anomalous traffic patterns or attempts to exploit known vulnerabilities may provide additional defense layers. Organizations should also consider disabling unnecessary services and features, particularly those related to Quality of Service configuration that are not actively required. The vulnerability's classification as critical according to industry standards underscores the need for immediate action, as it falls under the ATT&CK framework's privilege escalation and persistence tactics, potentially enabling long-term network infiltration. Regular security assessments and vulnerability scanning should be implemented to identify similar weaknesses in other network devices within the infrastructure.