CVE-2022-24167 in Tenda
Summary
by MITRE • 02/04/2022
Tenda routers G1 and G3 v15.11.0.17(9502)_CN were discovered to contain a command injection vulnerability in the function formSetDMZ. This vulnerability allows attackers to execute arbitrary commands via the dmzHost1 parameter.
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Analysis
by VulDB Data Team • 02/05/2022
The vulnerability identified as CVE-2022-24167 affects Tenda routers G1 and G3 models running firmware version v15.11.0.17(9502)_CN, representing a critical command injection flaw within the device management interface. This vulnerability resides in the formSetDMZ function, which processes network configuration parameters for DMZ (Demilitarized Zone) settings. The specific parameter dmzHost1 serves as the attack vector, where improper input validation allows malicious actors to inject arbitrary commands that execute with elevated privileges on the router's underlying operating system.
The technical nature of this vulnerability aligns with CWE-77 and CWE-94, categorizing it as a command injection weakness that enables arbitrary code execution. The flaw stems from insufficient sanitization of user-supplied input within the web application's backend processing logic, specifically in how the dmzHost1 parameter is handled during DMZ configuration updates. Attackers can exploit this by crafting malicious input that gets directly passed to system commands without proper filtering or escaping mechanisms, effectively bypassing authentication and authorization controls.
Operationally, this vulnerability poses significant risks to network security and device integrity. Successful exploitation allows remote attackers to execute arbitrary commands on the affected routers, potentially leading to complete system compromise, unauthorized network access, data exfiltration, or the installation of persistent backdoors. The attack surface extends beyond simple command execution to include potential lateral movement within the network, as compromised routers often serve as gateways to internal systems. Network administrators may face unauthorized changes to routing tables, DNS configurations, or firewall rules, creating opportunities for man-in-the-middle attacks or network disruption.
Mitigation strategies should focus on immediate firmware updates from Tenda's official sources to address the command injection vulnerability. Network segmentation and access controls should be implemented to limit exposure of these devices to untrusted networks. Regular security audits of network infrastructure, including vulnerability scanning and penetration testing, should be conducted to identify similar weaknesses. Additionally, implementing network monitoring solutions that detect anomalous command execution patterns can provide early warning of exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1059 (Command and Scripting Interpreter) and T1566 (Phishing) as attackers may use this vulnerability to establish persistent access and further compromise the network environment. Organizations should also consider implementing network access control lists and disabling unnecessary services to reduce the attack surface of these devices.