CVE-2024-3010: Tenda FH1205 Buffer Overflow Vulnerability

CVE-2024-3010 Overview

CVE-2024-3010 is a stack-based buffer overflow in the Tenda FH1205 router running firmware version 2.0.0.7(775). The flaw resides in the formSetCfm function handling requests to the /goform/setcfm endpoint. Manipulation of the funcpara1 argument overflows a fixed-size stack buffer, corrupting adjacent memory and the saved return address. The attack is network-reachable and requires low privileges. Public exploit documentation has been disclosed. The vendor was contacted but did not respond to the disclosure, leaving affected devices without an official patch.

Critical Impact
Remote attackers with low-privileged access can trigger a stack overflow in the router's web management interface, enabling arbitrary code execution, device takeover, and pivoting into internal networks.

Affected Products

Tenda FH1205 router (hardware)
Tenda FH1205 firmware version 2.0.0.7(775)
Deployments exposing /goform/setcfm on the management interface

Discovery Timeline

2024-03-28 - CVE-2024-3010 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-3010

Vulnerability Analysis

The vulnerability is a stack-based buffer overflow [CWE-121] and out-of-bounds write [CWE-787] in the router's web management binary. The formSetCfm handler processes HTTP POST requests submitted to /goform/setcfm. When the handler reads the funcpara1 parameter, it copies user-controlled data into a fixed-size stack buffer without validating length. An attacker who supplies an oversized value corrupts adjacent stack memory, including the saved return address. Successful exploitation leads to arbitrary code execution in the context of the web server process, which typically runs with elevated privileges on embedded routers.

Root Cause

The root cause is missing bounds checking on the funcpara1 request parameter before it is copied into a local stack buffer. The handler uses an unsafe string copy pattern common in MIPS-based Tenda firmware, where user input is trusted without length enforcement. This design flaw allows precise control over the stack layout.

Attack Vector

Exploitation requires network access to the device's HTTP management interface and low-privileged authentication. An attacker crafts a POST request to /goform/setcfm with an oversized funcpara1 value. Devices exposing the web interface to untrusted networks or the internet are directly reachable. Attackers on the LAN can also chain the flaw with credential reuse or default passwords.

See the GitHub Exploit Documentation and VulDB entry #258296 for technical details on the vulnerable code path.

Detection Methods for CVE-2024-3010

Indicators of Compromise

Unexpected HTTP POST requests to /goform/setcfm containing abnormally large funcpara1 values
Repeated crashes or reboots of the router's httpd process
Unusual outbound connections initiated by the router to attacker-controlled infrastructure
New or modified administrative accounts on the device

Detection Strategies

Inspect HTTP request logs on network gateways for POST bodies to /goform/setcfm exceeding expected parameter length thresholds
Deploy IDS signatures that match long non-printable payloads in the funcpara1 field
Correlate router availability alerts with authentication events on the web management interface

Monitoring Recommendations

Enable syslog forwarding from the router to a centralized log store for tamper-evident retention
Monitor DNS and NetFlow telemetry for anomalous egress from router management IPs
Alert on management-plane access from non-administrative network segments

How to Mitigate CVE-2024-3010

Immediate Actions Required

Restrict access to the router's web management interface to trusted management VLANs only and disable WAN-side administration
Change default and reused administrative credentials on all Tenda FH1205 devices
Isolate affected devices behind a firewall that inspects and rate-limits requests to /goform/setcfm
Evaluate replacement of the FH1205, given the vendor's lack of response to disclosure

Patch Information

No vendor patch is available. The reporter noted that Tenda did not respond to the disclosure. Operators should treat the affected firmware as end-of-support for this issue and plan hardware replacement or network-layer compensating controls.

Workarounds

Block inbound TCP traffic to the router's HTTP management port from untrusted networks
Place the device behind a reverse proxy or WAF that enforces strict length limits on POST parameters
Segment IoT and network infrastructure devices onto a dedicated VLAN with egress filtering
Disable remote management features when not strictly required

bash

# Example iptables rules restricting management access to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.0.2.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP