CVE-2022-26206 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 setLanguageCfg, via the langType parameter. This vulnerability allows attackers to execute arbitrary commands via a crafted request.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 03/18/2022
The vulnerability identified as CVE-2022-26206 affects multiple Totolink router models including A830R, A3100R, A950RG, A800R, A3000RU, and A810R with specific firmware versions. This represents a critical command injection flaw that resides within the web interface management functionality of these networking devices. The vulnerability is particularly concerning as it allows remote attackers to execute arbitrary commands on the affected devices without requiring authentication, making it a significant threat to network security and device integrity. The affected function setLanguageCfg processes the langType parameter which serves as the attack vector for this vulnerability.
The technical implementation of this command injection flaw stems from insufficient input validation and sanitization within the router's web application layer. When the langType parameter is processed by the setLanguageCfg function, the system fails to properly sanitize user-supplied input before incorporating it into system commands. This lack of proper input filtering creates an opportunity for attackers to inject malicious commands that will be executed with the privileges of the web application process. The vulnerability manifests as a classic command injection issue where crafted payloads can manipulate the underlying system shell to execute unintended operations. According to CWE-77, this maps directly to command injection vulnerabilities that occur when user-controllable data is passed to system commands without proper validation or escaping.
The operational impact of this vulnerability extends beyond simple unauthorized command execution, as it can enable attackers to completely compromise the affected router devices. An attacker could potentially gain full administrative control over the router, allowing them to modify network configurations, redirect traffic, install malware, or use the device as a pivot point for attacking other systems within the network. The vulnerability affects devices that are commonly deployed in residential and small office environments, making them attractive targets for cybercriminals seeking to establish persistent access points or launch broader attacks. The lack of authentication requirements means that this vulnerability can be exploited remotely, without any prior access credentials or physical presence at the device location.
Security practitioners should consider this vulnerability in the context of the ATT&CK framework, specifically under the T1059.001 technique for command and scripting interpreter. The attack surface for this vulnerability includes the web management interface of the routers, which typically operates on standard HTTP/HTTPS ports. Mitigation strategies should include immediate firmware updates from Totolink, network segmentation to limit access to affected devices, and implementing network monitoring to detect suspicious command execution patterns. The vulnerability also highlights the importance of input validation and the principle of least privilege in embedded system development. Organizations should also consider implementing intrusion detection systems that can identify and alert on command injection attempts targeting web applications, particularly those that handle user-supplied parameters in system calls.