CVE-2022-37078 in A7000R
Summary
by MITRE • 08/25/2022
TOTOLINK A7000R V9.1.0u.6115_B20201022 was discovered to contain a command injection vulnerability via the lang parameter at /setting/setLanguageCfg.
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Analysis
by VulDB Data Team • 10/01/2022
The vulnerability identified as CVE-2022-37078 represents a critical command injection flaw within the TOTOLINK A7000R router firmware version V9.1.0u.6115_B20201022. This issue resides in the web interface's language configuration endpoint at /setting/setLanguageCfg where the lang parameter fails to properly sanitize user input. The vulnerability stems from insufficient input validation and sanitization mechanisms that allow malicious actors to inject arbitrary commands directly into the system's command execution pipeline. This type of vulnerability falls under CWE-77 and CWE-94 categories, representing command injection and code injection weaknesses respectively, which are among the most dangerous web application security flaws.
The technical exploitation of this vulnerability occurs when an attacker submits malicious input through the lang parameter in the HTTP request to the specified endpoint. The router's web server processes this input without adequate sanitization, leading to potential command execution with the privileges of the web server process. Since many router web interfaces operate with elevated privileges to manage system functions, successful exploitation could allow attackers to execute arbitrary system commands, potentially gaining full control over the device. The vulnerability is particularly concerning as it exists in the language configuration functionality, which is frequently accessed and could be exploited through various attack vectors including web-based exploitation, social engineering, or automated scanning tools.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete system compromise and potential network infiltration. An attacker who successfully exploits this command injection could gain persistent access to the router, modify network configurations, redirect traffic, establish backdoors, or use the device as a pivot point for attacking other systems within the local network. The affected TOTOLINK A7000R model represents a popular consumer-grade router that may be deployed in residential and small office environments, making it a valuable target for attackers seeking to establish footholds in networks. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, specifically focusing on the use of web shells and command injection to maintain persistent access to compromised systems.
Mitigation strategies for CVE-2022-37078 should include immediate firmware updates from TOTOLINK to address the command injection vulnerability, proper input validation implementation, and network segmentation to limit the impact of potential exploitation. Organizations should also implement web application firewalls to monitor and filter malicious requests targeting the affected endpoint, conduct regular vulnerability assessments of network devices, and ensure that all firmware updates are applied promptly. Additionally, network administrators should disable unnecessary web management interfaces, implement strong authentication mechanisms, and monitor network traffic for suspicious command execution patterns. The vulnerability highlights the critical importance of input validation in web applications and the necessity of following secure coding practices to prevent command injection attacks that could lead to complete system compromise.