CVE-2024-39367 in AC3000
Summary
by MITRE • 01/14/2025
An os command injection vulnerability exists in the firewall.cgi iptablesWebsFilterRun() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
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Analysis
by VulDB Data Team • 08/22/2025
This vulnerability represents a critical os command injection flaw within the Wavlink AC3000 M33A8.V5030.210505 firmware, specifically affecting the firewall.cgi component's iptablesWebsFilterRun() function. The issue stems from insufficient input validation and sanitization of user-supplied data within the web interface, allowing malicious actors to inject arbitrary operating system commands through crafted HTTP requests. The vulnerability is authenticated, meaning an attacker must first establish valid credentials to exploit the flaw, though this does not mitigate the severity of potential impacts. This type of vulnerability falls under CWE-77 which specifically addresses command injection flaws where untrusted data is incorporated into operating system commands without proper validation or sanitization.
The technical exploitation of this vulnerability occurs through the manipulation of parameters within HTTP requests sent to the firewall.cgi endpoint. When the iptablesWebsFilterRun() function processes these requests, it fails to adequately sanitize or escape input values before incorporating them into system command executions. This allows an authenticated attacker to inject malicious commands that get executed with the privileges of the web server process, typically running with elevated system permissions. The vulnerability is particularly concerning because iptables commands are fundamental to network filtering and firewall operations, meaning successful exploitation could allow complete network access control bypass, packet filtering manipulation, and potential lateral movement within the network environment.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise and network infiltration capabilities. An attacker with valid credentials could leverage this flaw to gain persistent access to the device, modify firewall rules to allow unauthorized traffic, redirect network flows, or even establish backdoor access points. The implications are severe for network security as it directly undermines the device's primary security function as a firewall. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter, and T1068 for exploit for privilege escalation, as the compromised device can serve as a foothold for further network exploration and attack progression.
Organizations should implement immediate mitigations including firmware updates from Wavlink, network segmentation to limit access to affected devices, and strict access controls to reduce the attack surface. The vulnerability highlights the critical importance of input validation and secure coding practices in network device firmware development, particularly for components handling system-level operations. Regular security assessments of network infrastructure components and implementation of network monitoring solutions can help detect exploitation attempts. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to provide additional layers of protection against such command injection attacks. The vulnerability serves as a reminder of the persistent risks associated with embedded systems and the need for comprehensive security testing throughout the development lifecycle to prevent authenticated command injection flaws that can lead to complete system compromise.