CVE-2023-27232 in A7100RU
Summary
by MITRE • 03/29/2023
TOTOlink A7100RU V7.4cu.2313_B20191024 was discovered to contain a command injection vulnerability via the wanStrategy parameter at /setting/setWanIeCfg.
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Analysis
by VulDB Data Team • 11/16/2025
The vulnerability identified as CVE-2023-27232 represents a critical command injection flaw within the TOTOlink A7100RU router firmware version V7.4cu.2313_B20191024. This issue manifests through the wanStrategy parameter in the web interface configuration endpoint at /setting/setWanIeCfg, creating a significant security risk for affected devices. The vulnerability allows remote attackers to execute arbitrary commands on the affected router by manipulating the wanStrategy parameter, potentially leading to complete system compromise and unauthorized access to network resources.
This command injection vulnerability falls under CWE-77 which specifically addresses command injection flaws in software applications. The flaw exists due to insufficient input validation and sanitization of user-supplied data within the router's web management interface. When the wanStrategy parameter is processed, the system fails to properly validate or escape special characters that could be interpreted as command delimiters or operators. This allows an attacker to inject malicious commands that are subsequently executed by the underlying operating system of the router, which typically runs a Linux-based environment with shell access capabilities.
The operational impact of this vulnerability is severe and multifaceted. An attacker with remote access to the affected router can execute arbitrary code with the privileges of the web server process, which typically runs with elevated permissions on the device. This could enable full system compromise including but not limited to unauthorized network access, data exfiltration, installation of persistent backdoors, modification of network configurations, and potential use as a launching point for attacks against other devices within the local network. The vulnerability affects the router's WAN configuration functionality, which could allow attackers to modify internet connectivity settings and potentially redirect traffic through malicious endpoints.
From an attack perspective, this vulnerability maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1021.001 for remote services. The attack surface is particularly concerning as it allows remote exploitation without requiring authentication, making it accessible to any attacker who can reach the router's web interface. The vulnerability exists in the web management interface which typically exposes a wide attack surface and may be accessible from the internet if the router's configuration allows external access. Network segmentation or firewall rules that do not properly restrict access to the router's management interface may inadvertently expose this vulnerability to external attackers.
Mitigation strategies should focus on immediate firmware updates from the vendor, as this vulnerability has been addressed in subsequent releases. Network administrators should implement strict access controls limiting access to the router's web interface to trusted networks only, and consider disabling remote management features entirely. The implementation of network monitoring solutions that can detect anomalous command execution patterns or unusual network traffic from the affected device can provide additional detection capabilities. Regular vulnerability assessments and network scanning should be conducted to identify similar vulnerabilities in other network infrastructure components. Additionally, organizations should consider implementing intrusion prevention systems that can detect and block known attack patterns associated with command injection exploits, and maintain comprehensive network security monitoring to detect unauthorized access attempts.