CVE-2022-26211 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 CloudACMunualUpdate, via the deviceMac and deviceName parameters. 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-2022-26211 represents a critical command injection flaw affecting multiple Totolink router models including A830R, A3100R, A950RG, A800R, A3000RU, and A810R. This vulnerability exists within the CloudACMunualUpdate function and specifically targets the deviceMac and deviceName parameters, creating a pathway for remote attackers to execute arbitrary commands on affected devices. The flaw stems from insufficient input validation and sanitization mechanisms within the firmware implementation, allowing maliciously crafted requests to bypass security controls and directly interface with underlying system commands.
The technical nature of this vulnerability places it firmly within CWE-77, which categorizes command injection flaws as weaknesses that occur when application programs construct operating system commands using externally-provided values without proper validation or sanitization. The affected firmware versions demonstrate a classic example of improper input handling where user-supplied data flows directly into system command execution contexts. Attackers can exploit this by crafting HTTP requests containing malicious payloads in the deviceMac and deviceName parameters, which are then processed through shell command execution functions without adequate sanitization.
From an operational impact perspective, this vulnerability creates significant security risks for organizations and individual users relying on these router models. Successful exploitation allows attackers to gain full administrative control over affected devices, potentially enabling them to modify network configurations, redirect traffic, install malware, or establish persistent backdoors. The remote nature of the attack means that adversaries do not require physical access or local network presence to exploit the vulnerability, making it particularly dangerous in enterprise environments where network segmentation may not adequately protect against such attacks. The vulnerability also aligns with ATT&CK technique T1059.001 for command and script injection, representing a direct pathway for attackers to execute arbitrary code within the target environment.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Totolink, as the manufacturer likely released patches addressing the command injection flaw. Network administrators should implement strict firewall rules to limit access to administrative interfaces and consider network segmentation to reduce the attack surface. Additionally, monitoring network traffic for suspicious command execution patterns and implementing intrusion detection systems can help identify potential exploitation attempts. Organizations should also conduct thorough inventory assessments to identify all affected devices and ensure proper patch management protocols are in place. The vulnerability demonstrates the importance of secure input validation practices and proper sanitization of user-provided data in network device firmware implementations, aligning with industry best practices for secure software development lifecycle management.