CVE-2023-48859 in A3002RU
Summary
by MITRE • 12/06/2023
TOTOLINK A3002RU version 2.0.0-B20190902.1958 has a post-authentication RCE due to incorrect access control, allows attackers to bypass front-end security restrictions and execute arbitrary code.
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Analysis
by VulDB Data Team • 03/02/2026
The vulnerability identified as CVE-2023-48859 affects the TOTOLINK A3002RU router model running firmware version 2.0.0-B20190902.1958, representing a critical post-authentication remote code execution flaw that fundamentally undermines the device's security posture. This issue stems from inadequate access control mechanisms within the router's web interface, creating a pathway for malicious actors to circumvent legitimate authentication processes and gain unauthorized system-level access. The vulnerability operates within the context of a web application that should enforce strict authorization controls, yet fails to properly validate user permissions after successful authentication, allowing attackers to escalate their privileges and execute arbitrary commands on the underlying operating system.
The technical implementation of this flaw manifests through improper access control validation where the router's authentication system, while requiring users to log in, does not adequately verify that authenticated users possess appropriate permissions for specific administrative functions. This design weakness enables attackers who have gained access to any valid user account to exploit the system's trust model and execute commands with elevated privileges. The vulnerability is particularly concerning because it operates post-authentication, meaning that even legitimate users who have successfully authenticated can be exploited by attackers who manipulate the application's access control logic to gain additional privileges. The flaw typically involves manipulation of URL parameters, form fields, or API endpoints that should be restricted to administrative users, allowing attackers to bypass these controls and execute malicious code directly on the router's operating system.
The operational impact of CVE-2023-48859 extends far beyond simple unauthorized access, as it provides attackers with complete control over the affected router's functionality and data processing capabilities. Once exploited, attackers can modify network configurations, redirect traffic through malicious proxies, install persistent backdoors, or use the compromised device as a pivot point for attacking other systems within the local network. The vulnerability creates an ideal environment for attackers to establish persistent access to the network, potentially enabling them to monitor traffic, steal credentials, or launch further attacks against connected devices. This type of vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under the T1059.007 sub-technique for Command and Scripting Interpreter, where adversaries leverage legitimate system tools to execute malicious code. The security implications are compounded by the fact that routers serve as fundamental network infrastructure components, making successful exploitation particularly damaging for organizations and individuals who rely on these devices for network connectivity and security enforcement.
Mitigation strategies for CVE-2023-48859 must prioritize immediate firmware updates from TOTOLINK, as the vendor should have released patches addressing the access control flaws. Organizations should implement network segmentation to isolate affected devices and monitor for unusual network activity that might indicate exploitation attempts. Network administrators should also consider disabling unnecessary services and ports on the affected routers, while implementing intrusion detection systems to monitor for exploitation attempts. The vulnerability aligns with CWE-285, which describes improper authorization issues in software applications, emphasizing the importance of implementing proper access control mechanisms. Security teams should conduct thorough network assessments to identify all affected devices and implement multi-factor authentication where possible to reduce the risk of unauthorized access. Additionally, regular security audits of network infrastructure components should be performed to identify similar access control vulnerabilities that could provide similar attack vectors for adversaries.