CVE-2022-26207 in A800R
Summary
by MITRE • 03/16/2022
Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137_B20200730, A3000RU V5.9c.5185_B20201128, and A810R V4.1.2cu.5182_B20201026 were discovered to contain a command injection vulnerability in the function setDiagnosisCfg, via the ipDoamin parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.
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Analysis
by VulDB Data Team • 03/18/2022
The vulnerability identified as CVE-2022-26207 represents a critical command injection flaw affecting multiple Totolink router models including A830R, A3100R, A950RG, A800R, A3000RU, and A810R. This vulnerability exists within the setDiagnosisCfg function where the ipDoamin parameter is improperly handled, creating an avenue for remote code execution. The affected firmware versions span several model releases from 2019 through 2020, indicating this flaw has persisted across multiple iterations of these networking devices. The vulnerability stems from inadequate input validation and sanitization mechanisms that fail to properly filter user-supplied data before incorporating it into system commands.
The technical implementation of this vulnerability allows attackers to inject malicious commands through the ipDoamin parameter by crafting specially formatted requests. When the router processes these requests, it executes the injected commands with the privileges of the affected system process. This command injection occurs because the application directly concatenates user input into system command execution without proper sanitization or escaping mechanisms. The flaw operates at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous for networked devices. This vulnerability aligns with CWE-77 which specifically addresses command injection vulnerabilities in software systems. The attack surface is further expanded as these devices are commonly deployed in residential and small office environments where they may be directly exposed to external networks.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass potential full system compromise and persistent access. Attackers could leverage this flaw to install backdoors, modify network configurations, redirect traffic, or exfiltrate sensitive data from affected networks. The vulnerability affects devices that are typically deployed in unsecured environments, making them prime targets for exploitation. Network administrators face significant risk as compromised devices could serve as entry points for lateral movement within corporate networks or as part of larger attack campaigns. This vulnerability particularly concerns security practitioners due to its potential for creating persistent threats and the fact that it affects multiple device models from the same manufacturer. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1021.001 (Remote Services: Remote Desktop Protocol) through potential lateral movement and privilege escalation techniques.
Mitigation strategies for this vulnerability should begin with immediate firmware updates from Totolink, as the vendor has likely released patches addressing this specific flaw. Network segmentation and firewall rules should be implemented to restrict access to affected devices, particularly limiting direct internet exposure. Regular network monitoring and intrusion detection systems should be configured to identify anomalous command execution patterns that might indicate exploitation attempts. Device hardening practices including disabling unnecessary services, changing default credentials, and implementing network access controls should be enforced. Security teams should conduct comprehensive vulnerability assessments to identify all affected devices within their network infrastructure and prioritize remediation efforts based on risk exposure. Additionally, implementing network traffic analysis tools can help detect malicious command injection attempts by monitoring for suspicious patterns in network communications. The vulnerability demonstrates the critical importance of input validation in network device firmware and highlights the need for robust security testing in embedded systems. Organizations should also consider implementing zero-trust network architectures that limit the potential impact of such vulnerabilities by reducing the attack surface and enforcing strict access controls.