CVE-2024-42968 in FH1206
Summary
by MITRE • 08/15/2024
Tenda FH1206 v02.03.01.35 was discovered to contain a stack overflow via the Go parameter in the fromSafeUrlFilter function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
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Analysis
by VulDB Data Team • 08/17/2024
The vulnerability identified as CVE-2024-42968 affects the Tenda FH1206 router firmware version v02.03.01.35 and represents a critical stack overflow condition within the web interface handling logic. This flaw exists in the fromSafeUrlFilter function where the Go parameter is processed without adequate bounds checking or input validation. The vulnerability specifically manifests when the device receives a crafted POST request containing malicious input in the Go parameter, which leads to improper memory management during function execution. The stack overflow occurs because the application fails to validate the length of user-supplied input before copying it into a fixed-size buffer on the stack, creating a classic buffer overflow scenario that can be exploited by remote attackers.
From a technical perspective, this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which occurs when a program writes data beyond the boundaries of a fixed-length buffer allocated on the stack. The attack vector requires a remote attacker to send a specially crafted POST request to the router's web interface, exploiting the lack of proper input sanitization in the fromSafeUrlFilter function. The vulnerability enables a denial of service condition where the router's web interface becomes unresponsive or crashes entirely, rendering the device inaccessible to legitimate users. The impact extends beyond simple service disruption as the vulnerability could potentially be leveraged for more advanced exploitation techniques if the attacker can achieve code execution within the router's memory space.
The operational implications of this vulnerability are significant for network administrators and end-users who rely on the Tenda FH1206 router for their networking infrastructure. The denial of service condition affects not only the web management interface but also potentially disrupts network connectivity if the router becomes unresponsive, particularly in environments where remote management is required. The vulnerability demonstrates a fundamental flaw in the firmware's security architecture, highlighting inadequate input validation and memory management practices that are commonly addressed through secure coding guidelines. This issue affects the router's availability and reliability, potentially causing network outages and requiring manual intervention to restore service. The vulnerability also reflects poor adherence to secure software development practices and could indicate broader security weaknesses within the device's firmware codebase.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from the vendor, as the most effective solution requires patching the affected software to implement proper bounds checking and input validation. Network administrators should consider implementing network segmentation and access controls to limit exposure to the vulnerable web interface, while also monitoring for suspicious network traffic patterns that might indicate exploitation attempts. The vulnerability also underscores the importance of network security monitoring and intrusion detection systems that can identify and alert on malformed POST requests targeting web application interfaces. Organizations should implement regular firmware update policies and conduct vulnerability assessments of network infrastructure to identify similar weaknesses in other devices. Additionally, the use of web application firewalls and network access control lists can provide additional layers of protection against exploitation attempts, while the implementation of secure coding practices and regular security audits can help prevent similar issues in future firmware releases. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date firmware and implementing robust security controls for network infrastructure devices.