CVE-2023-26848 in A7100RU
Summary
by MITRE • 04/07/2023
TOTOlink A7100RU(V7.4cu.2313_B20191024) was discovered to contain a command injection vulnerability via the org parameter at setting/delStaticDhcpRules.
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Analysis
by VulDB Data Team • 11/12/2025
The CVE-2023-26848 vulnerability represents a critical command injection flaw in TOTOlink A7100RU routers running firmware version V7.4cu.2313_B20191024. This vulnerability exists within the web interface administration module, specifically in the setting/delStaticDhcpRules endpoint where the org parameter is improperly validated and processed. The flaw allows remote attackers to execute arbitrary commands on the affected device with the privileges of the web server process, potentially leading to complete system compromise and unauthorized access to the network infrastructure.
The technical implementation of this vulnerability stems from insufficient input sanitization and validation of the org parameter within the DHCP static rule deletion functionality. When a malicious actor submits crafted input through this parameter, the system fails to properly escape or filter special characters that could be interpreted as command delimiters or shell metacharacters. This lack of proper input validation creates an environment where attacker-controlled data can be executed as system commands, directly violating security principles of input validation and command separation. The vulnerability aligns with CWE-77 which describes improper neutralization of special elements used in commands, and specifically maps to CWE-94 which addresses the execution of arbitrary code due to improper input handling in web applications. The attack vector is particularly concerning as it requires no authentication, making it exploitable by remote adversaries who can leverage the web interface to gain system-level privileges.
The operational impact of this vulnerability extends beyond simple command execution, as it enables attackers to establish persistent access to the network infrastructure. Successful exploitation could allow adversaries to modify network configurations, redirect traffic through malicious servers, or use the compromised device as a pivot point for further attacks within the network. The affected TOTOlink A7100RU devices are commonly deployed in residential and small office environments, making them attractive targets for attackers seeking to establish backdoors or conduct man-in-the-middle attacks. This vulnerability also aligns with ATT&CK technique T1059.001 for command and script injection, and T1021.001 for remote services, as it allows for remote code execution through web-based interfaces. The compromise of such network devices can lead to data exfiltration, credential theft, and disruption of network services, potentially affecting multiple connected devices and users within the local network.
Mitigation strategies for CVE-2023-26848 should prioritize immediate firmware updates from TOTOlink, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation and access controls to limit exposure of affected devices, while monitoring for suspicious network traffic patterns that might indicate exploitation attempts. The implementation of web application firewalls and input validation rules can provide additional defense-in-depth measures to prevent exploitation attempts. Security teams should conduct comprehensive vulnerability assessments of all network devices to identify similar vulnerabilities in other router models or firmware versions, as this type of command injection flaw is often present in poorly secured network infrastructure devices. Regular security audits and patch management processes should be strengthened to prevent similar vulnerabilities from being introduced in future deployments, particularly focusing on input validation and command execution mechanisms in network device web interfaces.