CVE-2022-26209 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 setUploadSetting, via the FileName 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 CVE-2022-26209 vulnerability represents a critical command injection flaw affecting multiple Totolink router models including A830R, A3100R, A950RG, A800R, A3000RU, and A810R. This vulnerability resides within the setUploadSetting function where the FileName parameter is improperly handled, creating an avenue for remote code execution. The flaw stems from insufficient input validation and sanitization, allowing malicious actors to inject arbitrary commands through crafted HTTP requests. The vulnerability impacts firmware versions ranging from V5.9c.4729_B20191112 to V5.9c.5185_B20201128 across different router models, indicating a widespread issue affecting the entire Totolink product line. This type of vulnerability falls under CWE-77 which specifically addresses command injection flaws in software applications. The root cause of this vulnerability can be traced to improper input validation where user-supplied data is directly incorporated into system commands without adequate sanitization or escaping mechanisms.
The operational impact of this vulnerability is severe and multifaceted, as it enables attackers to execute arbitrary code on affected devices with the privileges of the web server process. An attacker could leverage this vulnerability to gain full administrative control over the affected routers, potentially leading to complete network compromise. The attack surface extends beyond simple command execution to include potential data exfiltration, network traffic interception, and the ability to establish persistent backdoors within the network infrastructure. This vulnerability directly maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1021.001 for remote services. The affected routers could be used as pivoting points for lateral movement within networks, especially in enterprise environments where these devices might serve as network gateways. Additionally, the vulnerability could be exploited to modify router configurations, disable security features, or redirect network traffic to malicious endpoints.
Mitigation strategies for CVE-2022-26209 should prioritize immediate firmware updates from Totolink, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation to isolate affected devices and monitor for suspicious network traffic patterns that might indicate exploitation attempts. Access controls should be strengthened through the implementation of firewall rules that restrict access to router management interfaces to trusted IP addresses only. The principle of least privilege should be applied by ensuring that only necessary services are exposed to the network and that default credentials are changed immediately upon device deployment. Network monitoring solutions should be configured to detect unusual command execution patterns or unexpected file upload activities. Security teams should also consider implementing intrusion detection systems that can identify and alert on known exploitation patterns associated with command injection attacks. Organizations should conduct thorough vulnerability assessments to identify any other devices running affected firmware versions and ensure that all network infrastructure components are regularly updated to maintain security posture against similar threats.