CVE-2022-48124 in A7100RU
Summary
by MITRE • 01/20/2023
TOTOlink A7100RU V7.4cu.2313_B20191024 was discovered to contain a command injection vulnerability via the FileName parameter in the setting/setOpenVpnCertGenerationCfg function.
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Analysis
by VulDB Data Team • 04/04/2025
The vulnerability identified as CVE-2022-48124 represents a critical command injection flaw within the TOTOlink A7100RU router firmware version V7.4cu.2313_B20191024. This issue resides in the setting/setOpenVpnCertGenerationCfg function where the FileName parameter fails to properly sanitize user input, creating an avenue for malicious command execution. The vulnerability stems from inadequate input validation and improper handling of user-supplied data within the router's web interface, allowing attackers to inject arbitrary commands that execute with the privileges of the web server process. This command injection vulnerability specifically affects the OpenVPN certificate generation functionality, which is a core security feature of the router.
The technical exploitation of this vulnerability occurs through manipulation of the FileName parameter within the setOpenVpnCertGenerationCfg API endpoint. When an attacker submits malicious input containing shell metacharacters or command delimiters, the router's firmware processes this input without proper sanitization, leading to arbitrary command execution on the underlying operating system. The vulnerability is classified as CWE-77 according to the Common Weakness Enumeration, which specifically addresses command injection flaws where user-supplied data is directly incorporated into system commands without proper validation or escaping. This weakness enables attackers to execute arbitrary code on the device, potentially compromising the entire network infrastructure.
The operational impact of CVE-2022-48124 extends beyond simple command execution, as it provides attackers with complete control over the affected router. An attacker who successfully exploits this vulnerability can manipulate network configurations, establish persistent backdoors, redirect network traffic, or use the device as a pivot point for attacking other systems within the local network. The vulnerability is particularly dangerous because it affects the OpenVPN certificate generation functionality, which is often used for secure remote access to networks. This means attackers could potentially compromise the security of VPN connections and gain unauthorized access to protected network resources. The attack surface is further expanded by the fact that this vulnerability exists in the web interface, making it accessible over the network without requiring physical access to the device. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) techniques, as it enables command execution and potential privilege escalation within the router's operating environment.
Mitigation strategies for CVE-2022-48124 should focus on immediate firmware updates from TOTOlink, as this vulnerability has likely been addressed in newer firmware releases. Network administrators should also implement network segmentation to limit the potential impact of exploitation and monitor network traffic for suspicious command execution patterns. Access controls should be strengthened by disabling unnecessary web interfaces and implementing strict authentication mechanisms. The vulnerability highlights the importance of input validation and proper sanitization of user-supplied data in network device firmware, particularly in functions that interact with system commands. Security professionals should also consider implementing intrusion detection systems that can identify and alert on suspicious command injection patterns, as well as conducting regular security assessments of network infrastructure to identify similar vulnerabilities in other network devices. Organizations should also maintain up-to-date inventory of all network devices and ensure timely application of security patches to prevent exploitation of known vulnerabilities.