CVE-2023-29802 in X18
Summary
by MITRE • 04/14/2023
TOTOLINK X18 V9.1.0cu.2024_B20220329 was discovered to contain a command injection vulnerability via the ip parameter in the setDiagnosisCfg function.
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Analysis
by VulDB Data Team • 12/14/2025
The vulnerability identified as CVE-2023-29802 represents a critical command injection flaw within the TOTOLINK X18 router firmware version V9.1.0cu.2024_B20220329. This issue resides in the setDiagnosisCfg function where the ip parameter is inadequately sanitized, creating an avenue for malicious actors to execute arbitrary commands on the affected device. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly filter or escape user-supplied data before incorporating it into system commands. This type of vulnerability falls under the CWE-77 category, specifically addressing command injection weaknesses in software applications.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing command delimiters or shell metacharacters within the ip parameter of the setDiagnosisCfg function. The router's firmware processes this unvalidated input directly within system command execution contexts, allowing attackers to inject and execute arbitrary shell commands with the privileges of the affected service or application. This vulnerability is particularly dangerous as it enables attackers to gain unauthorized access to the device's underlying operating system, potentially leading to complete system compromise and persistent access. The attack surface is broad since the vulnerability is accessible through network-based interactions with the router's web interface or API endpoints.
From an operational impact perspective, this command injection vulnerability poses severe risks to network security and device integrity. Successful exploitation allows attackers to execute arbitrary code on the router, potentially enabling them to modify network configurations, install malware, or establish persistent backdoors. The compromised device could serve as a launch point for further attacks within the local network, facilitating lateral movement and privilege escalation. Additionally, attackers might leverage this vulnerability to redirect network traffic, disable security features, or exfiltrate sensitive network information. The vulnerability affects the router's core functionality and undermines the trust model of the network infrastructure, as the device becomes a potential vector for broader security breaches.
Mitigation strategies for CVE-2023-29802 should prioritize immediate firmware updates from TOTOLINK to address the command injection vulnerability. Network administrators should implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in network infrastructure. The implementation of web application firewalls and input validation mechanisms can provide additional defense-in-depth layers. Organizations should also consider monitoring network traffic for suspicious command execution patterns and implementing proper network access controls to restrict unauthorized access to router management interfaces. This vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter, emphasizing the need for robust input validation and proper privilege separation in network device implementations.