CVE-2024-39765 in AC3000
Summary
by MITRE • 01/14/2025
Multiple OS command injection vulnerabilities exist in the internet.cgi set_add_routing() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to arbitrary command execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities.A command injection vulnerability exists in the `custom_interface` POST parameter.
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Analysis
by VulDB Data Team • 08/22/2025
The vulnerability identified as CVE-2024-39765 represents a critical security flaw within the Wavlink AC3000 M33A8.V5030.210505 router firmware, specifically within the internet.cgi set_add_routing() function. This issue manifests as multiple operating system command injection vulnerabilities that can be exploited through crafted HTTP requests targeting the device's web interface. The vulnerability stems from insufficient input validation and sanitization of user-supplied data, particularly within the custom_interface POST parameter that is processed by the routing configuration functionality. Attackers can leverage this weakness to execute arbitrary commands on the affected device with the privileges of the web server process, potentially compromising the entire network infrastructure.
The technical implementation of this vulnerability occurs when the router processes HTTP requests containing malicious payloads in the custom_interface parameter. The set_add_routing() function fails to properly sanitize or escape input values before incorporating them into system commands, creating a direct pathway for command injection attacks. This flaw aligns with CWE-77 which defines command injection as the improper handling of externally supplied input that is interpreted as commands by the operating system. The vulnerability requires authentication to exploit, meaning an attacker must first obtain valid credentials to access the web interface, but once authenticated, the command injection can be leveraged to execute arbitrary system commands. The attack surface is particularly concerning as it affects the routing configuration functionality, which typically operates with elevated privileges and can potentially allow attackers to modify network settings, redirect traffic, or establish persistent access points.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with the capability to manipulate network routing tables and potentially gain unauthorized access to internal network resources. The authenticated nature of the attack means that compromise can occur through credential theft, social engineering, or other initial access vectors, but once inside the system, attackers can perform actions such as adding malicious routes, redirecting network traffic, or even installing backdoors. The vulnerability can be exploited through standard web browser interactions, making it particularly dangerous as it requires minimal specialized tools for exploitation. This type of vulnerability is categorized under the ATT&CK technique T1059.001 which covers command and scripting interpreter execution, and represents a significant risk to network security as it allows attackers to move laterally within the network environment. The affected device's role as a network gateway makes this vulnerability particularly attractive to attackers seeking persistent access to enterprise networks.
Mitigation strategies for CVE-2024-39765 should prioritize immediate firmware updates from the vendor, as this represents a known vulnerability that requires patching at the source. Network administrators should implement network segmentation and access control measures to limit the potential impact of successful exploitation, particularly by restricting access to the device's web interface to authorized personnel only. Additional defensive measures include monitoring for unusual network traffic patterns that may indicate routing table modifications, implementing web application firewalls to detect and block malicious requests, and conducting regular security assessments of network infrastructure. The vulnerability demonstrates the importance of input validation and proper parameter sanitization in web applications, as well as the necessity of following secure coding practices to prevent command injection attacks. Organizations should also consider implementing network monitoring solutions that can detect anomalous behavior in routing configurations, as the successful exploitation of this vulnerability could result in significant network disruption and potential data exfiltration. Given the severity of command injection vulnerabilities, it is recommended that all affected devices be taken offline until proper patches are applied and security controls are verified.