CVE-2025-8019 in LBT-T300-T310
Summary
by MITRE • 07/22/2025
A vulnerability was found in Shenzhen Libituo Technology LBT-T300-T310 2.2.3.6. It has been rated as critical. Affected by this issue is the function sub_40B6F0 of the file at/appy.cgi. The manipulation of the argument wan_proto leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/24/2025
The vulnerability identified as CVE-2025-8019 represents a critical buffer overflow flaw within the LBT-T300-T310 network device firmware version 2.2.3.6 produced by Shenzhen Libituo Technology. This device operates within the realm of network infrastructure equipment, specifically targeting telecommunications and networking solutions. The vulnerability resides within the at/appy.cgi file, specifically in the sub_40B6F0 function, which processes network protocol configurations. The flaw manifests when the wan_proto argument is manipulated, creating conditions where arbitrary data can be written beyond the bounds of allocated memory buffers. This particular implementation demonstrates a classic buffer overflow vulnerability that falls under CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The remote exploitability of this vulnerability presents significant operational risks to organizations relying on this networking equipment. Attackers can leverage this flaw by sending specially crafted requests to the affected device through the web interface or API endpoints that process the wan_proto parameter. The disclosed exploit demonstrates that an attacker can achieve arbitrary code execution on the target device, potentially leading to complete system compromise. This capability enables malicious actors to gain persistent access to network infrastructure, potentially allowing them to redirect traffic, establish backdoors, or use the compromised device as a pivot point for further attacks within the network perimeter. The vulnerability's classification as critical indicates that it can be exploited without requiring authentication and that successful exploitation can result in severe consequences including data breaches, service disruption, and network infiltration.
The operational impact of CVE-2025-8019 extends beyond immediate device compromise to encompass broader network security implications. Organizations utilizing affected LBT-T300-T310 devices face potential exposure to advanced persistent threats where attackers can establish long-term access to critical network infrastructure. The vulnerability's presence in a telecommunications device means that successful exploitation could lead to man-in-the-middle attacks, traffic interception, or complete network segmentation compromises. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.007 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) when exploited for code execution. The attack surface is particularly concerning given that the exploit has been publicly disclosed, meaning that threat actors can readily implement similar techniques against unpatched systems. Organizations should immediately assess their network infrastructure for affected devices and implement network segmentation to limit potential lateral movement if compromise occurs.
Mitigation strategies for this vulnerability should encompass both immediate remediation and long-term security enhancements. The primary recommendation involves applying the vendor-provided firmware update that addresses the buffer overflow in the sub_40B6F0 function. Until patching is complete, network administrators should implement strict access controls limiting administrative access to the affected devices, disable unnecessary services, and monitor network traffic for anomalous patterns that might indicate exploitation attempts. The implementation of intrusion detection systems with signatures targeting this specific vulnerability can provide early warning capabilities. Additionally, organizations should consider network monitoring solutions that can detect unusual protocol behavior or unexpected traffic patterns that might indicate exploitation attempts. Security teams should also conduct thorough vulnerability assessments of their entire network infrastructure to identify other potentially vulnerable devices running similar firmware versions. The use of network segmentation and zero-trust principles can help limit the impact if exploitation occurs, ensuring that even if one device is compromised, the attacker cannot easily move laterally throughout the network infrastructure.