CVE-2024-39799 in AC3000
Summary
by MITRE • 01/14/2025
Multiple external config control vulnerabilities exists in the openvpn.cgi openvpn_server_setup() 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 configuration injection vulnerability exists in the `sel_open_interface` POST parameter.
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Analysis
by VulDB Data Team • 08/22/2025
The vulnerability identified as CVE-2024-39799 represents a critical security flaw within the Wavlink AC3000 M33A8.V5030.210505 router firmware, specifically affecting the openvpn.cgi component and its openvpn_server_setup() function. This issue falls under the category of external configuration control vulnerabilities, which are particularly dangerous as they allow attackers to manipulate system configuration parameters through external interfaces. The vulnerability is classified as a command injection flaw that can be exploited through crafted HTTP requests, making it highly accessible to remote attackers who can potentially gain unauthorized control over the affected device.
The technical exploitation of this vulnerability occurs through the manipulation of the sel_open_interface POST parameter within the openvpn_server_setup() functionality. This parameter injection vulnerability enables attackers to inject malicious commands that are subsequently executed by the underlying system. The flaw stems from inadequate input validation and sanitization of user-supplied data, allowing arbitrary commands to be passed directly to the system shell without proper authorization checks. This type of vulnerability is categorized as CWE-77 in the Common Weakness Enumeration catalog, which specifically addresses command injection flaws that occur when an application passes untrusted data to a command shell.
The operational impact of CVE-2024-39799 is severe, as authenticated attackers can leverage this vulnerability to execute arbitrary commands on the affected router with the privileges of the web application. This level of access can enable attackers to modify network configurations, establish persistent backdoors, exfiltrate sensitive data, or even use the compromised device as a pivot point for attacking other systems within the local network. The vulnerability's accessibility through HTTP requests means that an attacker does not need physical access to the device, making it particularly concerning for enterprise and home network environments where such devices are commonly deployed.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from the vendor, as the Wavlink AC3000 M33A8.V5030.210505 firmware likely contains patches addressing this specific issue. Network administrators should also implement strict access controls and authentication mechanisms to limit who can make requests to the affected CGI interface. The ATT&CK framework categorizes this type of vulnerability under T1059.001 (Command and Scripting Interpreter: PowerShell) and T1021.004 (Remote Services: SSH), as the exploitation involves command execution and remote access capabilities. Additionally, implementing network segmentation and monitoring for unusual HTTP traffic patterns can help detect potential exploitation attempts. Organizations should also consider disabling unnecessary services and features, particularly those that expose CGI interfaces to untrusted networks, as recommended in the NIST Cybersecurity Framework for managing critical infrastructure vulnerabilities.