CVE-2022-26208 in A800R
Summary
by MITRE • 03/16/2022
Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137_B20200730, A3000RU V5.9c.5185_B20201128, and A810R V4.1.2cu.5182_B20201026 were discovered to contain a command injection vulnerability in the function setWebWlanIdx, via the webWlanIdx parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.
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Analysis
by VulDB Data Team • 03/18/2022
The vulnerability identified as CVE-2022-26208 represents a critical command injection flaw affecting multiple Totolink router models including A830R, A3100R, A950RG, A800R, A3000RU, and A810R. This vulnerability resides within the web management interface of these devices, specifically within the setWebWlanIdx function that processes the webWlanIdx parameter. The flaw enables remote attackers to execute arbitrary commands on the affected devices through specially crafted HTTP requests, fundamentally compromising the device's security posture and potentially exposing the entire network to unauthorized access.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the web management interface. When the webWlanIdx parameter is processed by the setWebWlanIdx function, the system fails to properly validate or escape user-supplied input before incorporating it into system commands. This allows attackers to inject malicious commands that are then executed with the privileges of the web server process, typically running with elevated system permissions. The vulnerability aligns with CWE-77 which specifically addresses command injection flaws in software applications, and represents a classic example of how improper input handling can lead to complete system compromise. The attack vector is particularly dangerous as it requires no authentication, making it an ideal target for automated exploitation campaigns.
The operational impact of this vulnerability extends far beyond simple command execution, as it provides attackers with complete control over the affected router devices. Once exploited, adversaries can modify network configurations, redirect traffic, establish backdoors, or use the compromised devices as launching points for further attacks within the network. The vulnerability affects not just individual devices but entire network infrastructures, as routers serve as critical gateways for network traffic. From an ATT&CK framework perspective, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1021.001 (Remote Services: Remote Desktop Protocol) as attackers can leverage the compromised devices to establish persistent access and move laterally within networks. The implications are particularly severe for enterprise environments where these devices may be used as network edge routers or access points.
Mitigation strategies for CVE-2022-26208 should prioritize immediate firmware updates from Totolink, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should also implement network segmentation and access controls to limit exposure, particularly by blocking remote management access to these devices from untrusted networks. The principle of least privilege should be enforced by disabling unnecessary web management interfaces and restricting access to authorized personnel only. Additionally, regular security audits should include verification of device firmware versions and implementation of intrusion detection systems to monitor for exploitation attempts. Organizations should consider deploying web application firewalls to detect and block malicious requests targeting the vulnerable webWlanIdx parameter, and establish monitoring protocols to identify unauthorized configuration changes on affected devices. The vulnerability underscores the critical importance of maintaining up-to-date firmware and implementing robust network security controls to prevent exploitation of similar command injection flaws in network infrastructure devices.