CVE-2024-33212 in FH1206
Summary
by MITRE • 04/23/2024
Tenda FH1206 V1.2.0.8(8155)_EN was discovered to contain a stack-based buffer overflow vulnerability via the funcpara1 parameter in ip/goform/setcfm.
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Analysis
by VulDB Data Team • 08/17/2024
The vulnerability identified as CVE-2024-33212 affects the Tenda FH1206 router firmware version V1.2.0.8(8155)_EN and represents a critical stack-based buffer overflow flaw that can be exploited through the funcpara1 parameter within the ip/goform/setcfm endpoint. This issue resides in the web interface handling mechanism of the router's firmware, where improper input validation allows attackers to craft malicious requests that exceed the allocated buffer space on the stack. The vulnerability manifests when the device processes requests containing excessively long strings in the funcpara1 parameter, leading to memory corruption that can potentially allow arbitrary code execution or system crashes. The affected parameter is part of the configuration management interface, making it accessible through standard web-based administrative functions that are commonly used by network administrators to configure router settings.
The technical exploitation of this vulnerability follows the typical stack-based buffer overflow pattern where an attacker can overwrite adjacent memory locations including return addresses, function pointers, and other critical control data. The flaw stems from inadequate bounds checking in the firmware's input processing routines, specifically within the setcfm form handler that manages configuration parameters. This vulnerability directly maps to CWE-121 Stack-based Buffer Overflow, which is classified as a high-severity weakness in the Common Weakness Enumeration catalog and is frequently targeted in IoT device exploitation campaigns. The attack surface is particularly concerning given that the affected parameter is part of a web-based configuration interface that may be accessible from the local network or potentially exposed to remote attackers through misconfigured firewall rules.
Operationally, this vulnerability presents significant risks to network security and system stability as it could enable attackers to gain unauthorized access to the router's administrative functions, potentially leading to complete device compromise. The stack overflow condition can result in denial of service scenarios where the device becomes unresponsive or enters a crash loop, disrupting network connectivity for all devices relying on that router. More critically, successful exploitation could allow attackers to execute arbitrary code with the privileges of the web server process, potentially enabling them to install backdoors, modify network configurations, or use the device as a pivot point for attacking other systems within the local network. The vulnerability is particularly dangerous in environments where routers are not regularly updated or monitored for security patches, as it provides a persistent entry point for attackers who may already have network access.
Mitigation strategies for CVE-2024-33212 should prioritize immediate firmware updates from Tenda if available, as this represents the most effective defense against the vulnerability. Network administrators should implement network segmentation to limit access to administrative interfaces and ensure that only authorized personnel can reach the router configuration pages. Additionally, monitoring for unusual network traffic patterns or attempts to access the ip/goform/setcfm endpoint should be implemented through network intrusion detection systems. The vulnerability aligns with tactics described in the MITRE ATT&CK framework under T1071.004 Application Layer Protocol: DNS and T1059.001 Command and Scripting Interpreter: PowerShell, as attackers may use the compromised device to establish command and control channels or execute further reconnaissance activities. Regular security assessments of network infrastructure should include verification of firmware versions and patch management processes to prevent exploitation of similar vulnerabilities in other network devices. Organizations should also consider implementing network access controls that restrict access to administrative interfaces from external networks and maintain detailed logs of configuration changes to detect potential unauthorized modifications.