CVE-2024-30629 in FH1205
Summary
by MITRE • 03/29/2024
Tenda FH1205 v2.0.0.7(775) has a stack overflow vulnerability in the list1 parameter from fromDhcpListClient function.
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Analysis
by VulDB Data Team • 08/20/2024
The Tenda FH1205 v2.0.0.7(775) router firmware contains a critical stack overflow vulnerability within its web management interface that arises from improper input validation in the fromDhcpListClient function. This vulnerability specifically affects the list1 parameter handling, creating a condition where maliciously crafted input can overwrite adjacent stack memory locations. The flaw represents a classic buffer overflow scenario where insufficient bounds checking allows an attacker to exceed the allocated buffer space and potentially execute arbitrary code with elevated privileges. Such vulnerabilities are particularly dangerous in network infrastructure devices as they can provide attackers with persistent access to the underlying network and potentially enable further lateral movement within the compromised environment. The vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is categorized as a high-risk weakness in the Common Weakness Enumeration framework.
The technical exploitation of this vulnerability occurs when an attacker submits a specially crafted payload to the list1 parameter through the web interface or API endpoints that utilize the fromDhcpListClient function. The router's firmware fails to properly validate the length of input data before copying it into a fixed-size stack buffer, allowing the attacker to overwrite return addresses, function pointers, and other critical stack variables. This type of vulnerability is particularly concerning as it can be exploited through unauthenticated network access, making it a prime target for automated scanning tools and remote attackers. The attack surface is further expanded by the fact that DHCP client list functionality is typically accessible through standard management interfaces that may not require authentication, enabling attackers to leverage this weakness without prior access credentials. According to ATT&CK framework technique T1210, this vulnerability aligns with the exploitation of vulnerabilities in remote services to gain initial access or escalate privileges within a network environment.
The operational impact of this vulnerability extends beyond simple code execution to potentially compromise the entire network infrastructure controlled by the affected router. Successful exploitation could allow attackers to gain root-level access to the device, enabling them to modify network configurations, redirect traffic, install backdoors, or use the compromised device as a pivot point for attacking other systems within the local network. The router's role as a central networking component makes it an attractive target for attackers seeking persistent access, as it can provide continuous network visibility and control over all connected devices. Network administrators may face challenges in detecting such compromises since the malicious activity could be disguised as legitimate network traffic or administrative operations. Additionally, the vulnerability could be exploited to create persistent command and control channels that would remain active even after router reboots, making detection and remediation significantly more difficult. The risk is compounded by the fact that many organizations may not regularly update their networking equipment, leaving devices vulnerable to known exploits for extended periods. This vulnerability demonstrates the critical importance of firmware security updates and proper input validation in embedded networking systems.