CVE-2024-30623 in FH1205
Summary
by MITRE • 03/29/2024
Tenda FH1205 v2.0.0.7(775) has a stack overflow vulnerability in the page parameter from fromDhcpListClient function.
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Analysis
by VulDB Data Team • 03/14/2025
The vulnerability identified as CVE-2024-30623 affects the Tenda FH1205 router firmware version v2.0.0.7(775) and represents a critical stack overflow condition within the web interface handling logic. This flaw exists in the fromDhcpListClient function where the page parameter is processed without adequate input validation or bounds checking, creating an exploitable condition that could allow remote code execution or system compromise.
The technical implementation of this vulnerability stems from improper buffer management within the router's web server component. When the fromDhcpListClient function processes the page parameter from HTTP requests, it fails to validate the length or content of user-supplied input before copying it into a fixed-size stack buffer. This classic buffer overflow scenario occurs because the firmware does not implement proper input sanitization or size constraints on the page parameter, allowing an attacker to craft malicious requests that exceed the allocated buffer space and overwrite adjacent memory locations including return addresses and control data.
From an operational perspective, this vulnerability presents significant risk to network security as it allows remote unauthenticated attackers to exploit the stack overflow condition through web interface access. The attack surface is particularly concerning given that routers typically operate in network perimeters where they are exposed to external traffic and may be located in unsecured environments. Successful exploitation could result in complete system compromise, enabling attackers to execute arbitrary code, gain persistent access, or potentially escalate privileges within the router's operating environment.
The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking allows data to overwrite adjacent memory. This weakness is particularly dangerous in embedded systems like routers where memory corruption can lead to system instability, unauthorized access, or complete device takeover. The ATT&CK framework categorizes this type of vulnerability under T1210: Exploitation of Remote Services, as it leverages web interface access to exploit a remote service with elevated privileges.
Mitigation strategies should include immediate firmware updates from Tenda to address the stack overflow condition through proper input validation and buffer size enforcement. Network administrators should implement strict firewall rules to restrict access to router management interfaces, limiting exposure to trusted internal networks only. Additionally, monitoring for unusual traffic patterns or attempts to access the affected web interface parameters can provide early detection of exploitation attempts. Organizations should also consider implementing network segmentation and regular vulnerability assessments to identify similar issues in other network equipment. The most effective long-term solution involves updating to firmware versions that properly validate all user-supplied input and implement robust memory management practices to prevent similar buffer overflow conditions from occurring in the future.