CVE-2022-37083 in A7000R
Summary
by MITRE • 08/25/2022
TOTOLINK A7000R V9.1.0u.6115_B20201022 was discovered to contain a command injection vulnerability via the ip parameter at the function setDiagnosisCfg.
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Analysis
by VulDB Data Team • 08/25/2022
The vulnerability identified as CVE-2022-37083 represents a critical command injection flaw within the TOTOLINK A7000R router firmware version V9.1.0u.6115_B20201022. This issue resides in the setDiagnosisCfg function where the ip parameter is improperly handled, 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 user-supplied data before incorporating it into system commands. This particular implementation flaw allows attackers to inject malicious commands through the ip parameter, potentially enabling complete system compromise. The affected device operates under a web-based management interface that processes diagnostic configuration requests, making the vulnerability accessible through network-based attacks without requiring physical access to the device.
The technical exploitation of this vulnerability follows established patterns for command injection attacks as categorized under CWE-77 and CWE-88 within the Common Weakness Enumeration framework. Attackers can craft malicious payloads that target the ip parameter in the setDiagnosisCfg function, leveraging the lack of proper input sanitization to execute unauthorized commands with the privileges of the web application process. This typically involves appending command delimiters such as semicolons, ampersands, or other shell metacharacters to the ip parameter value, which then gets processed by the system shell without adequate filtering. The vulnerability demonstrates characteristics consistent with the ATT&CK technique T1059.001 for Command and Scripting Interpreter, specifically targeting the use of shell commands to achieve unauthorized system access. The attack surface is particularly concerning as it allows for remote code execution without authentication, potentially enabling attackers to gain full administrative control over the network device.
The operational impact of CVE-2022-37083 extends beyond simple privilege escalation to encompass complete network infrastructure compromise. Successful exploitation can lead to persistent backdoor access, data exfiltration, and potential lateral movement within the network environment. The affected TOTOLINK A7000R router serves as a critical gateway device in many home and small office networks, making it an attractive target for attackers seeking to establish persistent access points. The vulnerability's remote exploitability means that attackers can target these devices from anywhere on the internet, particularly concerning given the widespread deployment of this router model. Organizations and individuals utilizing this firmware version face significant risk of unauthorized network access, potential data breaches, and the possibility of these devices being recruited into botnet formations for distributed denial-of-service attacks. The vulnerability also impacts network security posture by potentially allowing attackers to modify routing configurations, disable security features, or redirect network traffic through malicious intermediaries.
Mitigation strategies for CVE-2022-37083 should prioritize immediate firmware updates from TOTOLINK to address the underlying command injection vulnerability. Network administrators must implement robust network segmentation and access controls to limit potential attack vectors and reduce the impact of successful exploitation. Regular vulnerability assessments and network monitoring should be conducted to detect anomalous behavior that might indicate exploitation attempts. The implementation of web application firewalls and input validation rules can provide additional defense-in-depth measures to prevent malicious command injection attempts. Organizations should also consider disabling unnecessary services and ports on affected devices, particularly those related to the web management interface. Security teams must establish incident response procedures specifically addressing command injection vulnerabilities and ensure that all network devices are regularly updated with the latest security patches. The vulnerability highlights the importance of secure coding practices and input validation, emphasizing that proper sanitization of user-supplied data is fundamental to preventing command injection attacks. Additionally, network administrators should implement monitoring solutions that can detect unusual command execution patterns and alert security teams to potential exploitation attempts.