CVE-2024-39359 in AC3000
Summary
by MITRE • 01/14/2025
A stack-based buffer overflow vulnerability exists in the wireless.cgi DeleteMac() 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 this vulnerability.
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Analysis
by VulDB Data Team • 08/22/2025
This vulnerability represents a critical stack-based buffer overflow in the wireless.cgi component of Wavlink AC3000 M33A8.V5030.210505 firmware, classified under CWE-121 which specifically addresses stack-based buffer overflow conditions. The flaw resides within the DeleteMac() function that processes HTTP requests without adequate input validation or bounds checking. When an authenticated attacker submits a malicious HTTP request containing oversized data to the wireless.cgi endpoint, the application fails to properly validate the input length before copying it to a fixed-size stack buffer. This fundamental programming error creates a condition where attacker-controlled data can overwrite adjacent stack memory locations, potentially corrupting program execution flow and allowing arbitrary code execution.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables full system compromise through authenticated remote code execution. Attackers exploiting this vulnerability can execute arbitrary commands with the privileges of the web server process, typically running as root or system-level user. The attack requires authentication, limiting the attack surface to users with valid credentials, but this still represents a significant risk in environments where administrative access might be compromised or where the device is accessible to untrusted users. The vulnerability affects the device's wireless management functionality, potentially allowing attackers to modify wireless settings, disable security features, or establish persistent access points.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for spearphishing attachments, as it enables attackers to execute malicious commands and potentially deliver additional payloads. The stack-based buffer overflow creates a predictable attack surface that can be exploited through standard penetration testing methodologies. The vulnerability demonstrates poor input validation practices and inadequate memory management that violates security best practices outlined in OWASP Top Ten and NIST SP 800-53 security controls. Organizations should immediately implement network segmentation to limit access to administrative interfaces and ensure that only authorized personnel can make authenticated requests to wireless management endpoints.
Mitigation strategies should include firmware updates from Wavlink to address the buffer overflow condition, implementation of network access controls to restrict administrative access, and deployment of intrusion detection systems to monitor for suspicious HTTP requests to wireless.cgi endpoints. The vulnerability highlights the importance of secure coding practices including input validation, bounds checking, and stack protection mechanisms. Network administrators should also consider implementing web application firewalls to filter malicious requests and establish monitoring procedures for unauthorized access attempts to wireless management interfaces. Regular security assessments of network devices and firmware updates form essential components of defense-in-depth strategies to protect against similar vulnerabilities in network infrastructure equipment.