CVE-2024-42950 in FH1201
Summary
by MITRE • 08/15/2024
Tenda FH1201 v1.2.0.14 (408) was discovered to contain a stack overflow via the Go parameter in the fromSafeClientFilter function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/22/2024
The vulnerability identified as CVE-2024-42950 affects the Tenda FH1201 router model running firmware version v1.2.0.14 build 408. This device represents a common consumer-grade networking equipment that serves as a gateway for home and small office networks, making it a potentially attractive target for cyber adversaries seeking to disrupt network services or establish persistent access points. The vulnerability manifests within the web-based management interface of the device, specifically within the fromSafeClientFilter function that processes incoming HTTP requests. This function handles client filtering operations and is responsible for managing access control lists that govern which devices can communicate through the router's network services.
The technical flaw stems from improper input validation within the Go parameter processing logic of the fromSafeClientFilter function. When a crafted POST request is sent to the router's web interface, the system fails to properly bounds-check the input data before copying it onto the stack. This classic stack buffer overflow vulnerability occurs because the implementation does not validate the length of the Go parameter against the allocated buffer size, allowing an attacker to overflow the stack space and overwrite adjacent memory locations. The vulnerability is particularly concerning as it operates at the application layer, requiring only network access to the device's management interface to exploit.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it can be leveraged to cause system instability and potentially allow for more sophisticated attacks. An attacker who successfully exploits this vulnerability can cause the router to crash or restart, effectively creating a denial of service condition that disrupts network connectivity for all devices connected to the affected network. The DoS condition can be triggered repeatedly, making it a persistent threat that can be used to maintain network disruption over time. Additionally, the stack overflow could potentially be exploited to execute arbitrary code if the attacker can control the overwritten return addresses or other critical memory locations, though the current analysis suggests the primary impact remains as a denial of service vector.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from the vendor, as the device manufacturer has likely released patches addressing this specific stack overflow condition. Network administrators should implement network segmentation and access controls to limit exposure of management interfaces to trusted networks only, reducing the attack surface available to potential adversaries. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which is classified under the Common Weakness Enumeration framework as a fundamental programming error that occurs when data is copied into a buffer without proper bounds checking. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1210 Exploitation of Remote Services, as it involves exploiting a service running on a network device to gain unauthorized access or cause disruption. Organizations should also consider implementing intrusion detection systems to monitor for suspicious POST requests targeting the affected router management interface, and establish regular vulnerability assessment procedures to identify similar issues in other network equipment.