CVE-2022-48066 in A830R
Summary
by MITRE • 01/27/2023
An issue in the component global.so of Totolink A830R V4.1.2cu.5182 allows attackers to bypass authentication via a crafted cookie.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 03/28/2025
The vulnerability identified as CVE-2022-48066 resides within the global.so component of the Totolink A830R router firmware version V4.1.2cu.5182, representing a critical authentication bypass flaw that undermines the device's security posture. This issue specifically targets the router's cookie handling mechanism, which is fundamental to maintaining secure session management and user authentication. The vulnerability enables malicious actors to circumvent the standard authentication process by crafting specially formatted cookies that appear legitimate to the router's authentication system. Such a flaw fundamentally compromises the router's ability to distinguish between authorized and unauthorized users, creating an entry point for potential attackers to gain administrative access to the device.
The technical implementation of this vulnerability stems from insufficient validation of cookie values within the global.so component, which operates as a core module responsible for managing various system functions including authentication routines. When the router processes incoming requests, it relies on cookie data to verify user credentials and maintain session state. However, the flawed implementation fails to properly validate the integrity and authenticity of these cookie values, allowing attackers to manipulate cookie contents to impersonate legitimate users. This weakness aligns with CWE-287, which addresses improper authentication issues, and represents a classic example of how weak session management can lead to complete system compromise. The vulnerability specifically affects the router's web-based administration interface, where cookie-based authentication is employed to maintain user sessions.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete administrative control over the affected router. Once authenticated, malicious actors can modify network configurations, change administrator passwords, install malicious firmware, or establish backdoor access points. The attack surface is particularly concerning given that many users do not regularly update their router firmware, leaving devices vulnerable for extended periods. This vulnerability also enables attackers to perform reconnaissance activities on the local network, potentially leading to further exploitation of connected devices. According to ATT&CK framework, this represents a privilege escalation technique under T1548.001, where attackers leverage authentication bypasses to gain administrative privileges. The vulnerability can be exploited remotely without requiring physical access to the device, making it particularly dangerous for home and small office networks.
Mitigation strategies for CVE-2022-48066 should prioritize immediate firmware updates from Totolink, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should also implement additional security measures including network segmentation to limit the impact of potential compromises, monitoring for suspicious authentication attempts, and regular security audits of network infrastructure. The implementation of strong access controls, such as multi-factor authentication where available, can provide additional layers of protection. Organizations should also consider disabling unnecessary services and ports, particularly those related to the web administration interface, when not actively required. Regular vulnerability scanning and penetration testing of network devices can help identify similar authentication bypass vulnerabilities in other network equipment. Additionally, network monitoring solutions should be configured to detect unusual cookie patterns or authentication behavior that might indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date firmware across all network infrastructure devices and demonstrates how seemingly minor authentication flaws can lead to complete system compromise.