CVE-2024-32286 in W30E
Summary
by MITRE • 04/17/2024
Tenda W30E v1.0 V1.0.1.25(633) firmware has a stack overflow vulnerability located via the page parameter in the fromVirtualSer function.
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Analysis
by VulDB Data Team • 10/26/2024
The vulnerability identified as CVE-2024-32286 affects the Tenda W30E v1.0 V1.0.1.25(633) wireless router firmware, representing a critical stack overflow flaw that resides within the fromVirtualSer function. This issue demonstrates a classic buffer management failure where the device fails to properly validate input parameters before processing them in memory. The vulnerability specifically targets the page parameter, which serves as an entry point for malicious input that can trigger the overflow condition. Such stack-based buffer overflows typically occur when a program writes more data to a fixed-length buffer than it can accommodate, leading to memory corruption that may result in arbitrary code execution or system crashes. The affected firmware version represents a widely deployed consumer-grade networking device that operates within corporate and residential environments, amplifying the potential impact of this vulnerability.
The technical implementation of this flaw demonstrates poor input validation practices within the router's web interface processing logic. When the page parameter is passed to the fromVirtualSer function, the firmware fails to implement proper bounds checking or length validation before copying user-supplied data into stack-based buffers. This weakness allows an attacker to craft malicious input that exceeds the allocated buffer space, causing the stack to overflow and potentially overwrite adjacent memory locations including return addresses and function pointers. According to CWE-121, this vulnerability maps directly to stack-based buffer overflow conditions where insufficient boundary checking permits writes beyond the buffer limits. The attack vector is particularly concerning as it operates through the web-based administrative interface, making it accessible to remote attackers without physical access to the device. This aligns with ATT&CK technique T1210 which describes exploitation of software vulnerabilities to gain access to systems through remote interfaces.
The operational impact of this vulnerability extends beyond simple device instability to encompass potential full system compromise and unauthorized access to network infrastructure. An attacker who successfully exploits this stack overflow can potentially execute arbitrary code with the privileges of the web server process, which typically runs with elevated permissions within the router's operating environment. This could enable the attacker to modify network configurations, intercept traffic, establish persistent backdoors, or use the compromised device as a pivot point for further attacks within the local network. The vulnerability affects not only the device's operational integrity but also poses significant risks to the broader network security posture, particularly in environments where these devices serve as primary network gateways. The affected Tenda W30E model represents a common consumer-grade device that may be deployed in both home and small office settings, where network security awareness is often limited, making such vulnerabilities particularly dangerous in practice.
Mitigation strategies for CVE-2024-32286 should prioritize immediate firmware updates from Tenda, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation and access controls to limit exposure of these devices to untrusted networks, while also considering the deployment of intrusion detection systems to monitor for exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and input validation, particularly for web interfaces that handle user-provided parameters. Organizations should conduct thorough vulnerability assessments of their network infrastructure to identify other potentially affected devices, as similar issues may exist in other router models or firmware versions. Additionally, implementing network monitoring solutions that can detect anomalous traffic patterns or attempts to exploit known vulnerabilities can provide early warning capabilities. Regular firmware update policies and network security awareness training for personnel managing such devices are essential to maintain operational security and prevent exploitation of similar vulnerabilities in the future.