CVE-2024-34945 in FH1206
Summary
by MITRE • 05/14/2024
Tenda FH1206 V1.2.0.8(8155)_EN was discovered to contain a stack-based buffer overflow vulnerability via the PPW parameter at ip/goform/WizardHandle.
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Analysis
by VulDB Data Team • 05/14/2024
The vulnerability identified as CVE-2024-34945 affects the Tenda FH1206 router model running firmware version V1.2.0.8(8155)_EN. This issue manifests as a stack-based buffer overflow within the web interface administration functionality, specifically when processing the PPW parameter through the ip/goform/WizardHandle endpoint. The vulnerability represents a critical security flaw that could enable remote code execution or system compromise. The affected device operates a web-based management interface that handles configuration requests through form-based submissions, making it susceptible to malformed input processing. This particular vulnerability falls under the CWE-121 stack-based buffer overflow category which is classified as a fundamental memory corruption vulnerability.
The technical exploitation of this vulnerability occurs when an attacker submits a specially crafted PPW parameter value that exceeds the allocated stack buffer size. The web application fails to properly validate or limit the input length before copying it into a fixed-size buffer, allowing the overflow to overwrite adjacent stack memory locations. This memory corruption can potentially overwrite return addresses, function pointers, or other critical control data structures, enabling an attacker to redirect program execution flow. The vulnerability is particularly concerning because it affects the router's administrative interface which is typically accessible over the network, making remote exploitation possible without physical access to the device. The attack surface is further expanded by the fact that this is a web-based form handler, meaning exploitation could occur through standard web browser interactions.
The operational impact of this vulnerability extends beyond simple denial of service or information disclosure. A successful exploitation could result in complete system compromise, allowing attackers to execute arbitrary code with the privileges of the web server process. This would enable attackers to gain persistent access to the network, modify router configurations, redirect traffic, or use the device as a pivot point for attacking other systems within the local network. The affected Tenda FH1206 model represents a common consumer-grade router that may be deployed in residential or small office environments, making it a valuable target for attackers seeking to establish footholds within networks. The vulnerability's presence in the wizard handling functionality suggests that it could be triggered during routine setup or configuration processes, potentially making exploitation more frequent than typical buffer overflow attacks.
Mitigation strategies for CVE-2024-34945 should prioritize immediate firmware updates from Tenda, as this is the most effective defense against the known vulnerability. Network administrators should implement strict access controls limiting administrative interface access to trusted networks only, using firewall rules to restrict access to the ip/goform/WizardHandle endpoint. Additional protective measures include monitoring network traffic for suspicious parameter values and implementing web application firewalls to detect and block malformed requests targeting the vulnerable endpoint. The vulnerability aligns with ATT&CK technique T1210 for exploiting weaknesses in remote services, and represents a common vector for initial access in network penetration testing scenarios. Organizations should also consider network segmentation to limit the potential impact if exploitation occurs, ensuring that compromised routers cannot be used as entry points for broader network attacks. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in other network infrastructure devices.