CVE-2022-28582 in A7100RU
Summary
by MITRE • 05/05/2022
It is found that there is a command injection vulnerability in the setWiFiSignalCfg interface in TOTOlink A7100RU (v7.4cu.2313_b20191024) router, which allows an attacker to execute arbitrary commands through a carefully constructed payload.
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Analysis
by VulDB Data Team • 05/08/2022
The command injection vulnerability identified in CVE-2022-28582 affects the TOTOlink A7100RU router running firmware version v7.4cu.2313_b20191024 and specifically targets the setWiFiSignalCfg interface. This vulnerability represents a critical security flaw that allows remote attackers to execute arbitrary commands on the affected device by crafting malicious payloads. The issue stems from inadequate input validation and sanitization within the router's web interface, creating an avenue for attackers to inject and execute operating system commands directly on the device. The vulnerability exists at the application layer where user-supplied parameters are not properly filtered or escaped before being processed by the underlying system shell.
The technical exploitation of this vulnerability occurs through the setWiFiSignalCfg interface which likely accepts parameters related to wireless configuration settings. When an attacker submits a malicious payload containing command injection characters such as semicolons, ampersands, or other shell metacharacters, the router fails to properly sanitize these inputs. This allows the injected commands to be executed within the context of the router's operating system, potentially granting attackers full control over the device's functionality. The vulnerability aligns with CWE-77 which describes command injection flaws where untrusted data is passed to an operating system command without proper validation or escaping. This type of vulnerability is particularly dangerous in network infrastructure devices as it can lead to complete system compromise and unauthorized access to the local network.
The operational impact of this vulnerability extends beyond simple command execution, as it can enable attackers to perform a wide range of malicious activities including but not limited to data exfiltration, network reconnaissance, port scanning, and establishing persistent access through backdoor creation. The compromised router can serve as a pivot point for attacking other devices on the local network, potentially leading to broader security breaches within the organization or household network. Additionally, attackers could modify router configurations, disable security features, or redirect traffic through malicious proxies. This vulnerability directly maps to several ATT&CK techniques including T1059.001 for command and script interpreter, T1046 for network service discovery, and T1566 for phishing with malicious attachments, as the compromised device could be used to further propagate attacks.
Mitigation strategies for this vulnerability should include immediate firmware updates from the vendor to address the command injection flaw, along with network segmentation to limit the potential impact of compromise. Network administrators should implement strict input validation controls at all application interfaces and consider deploying web application firewalls to detect and block malicious payloads. The router should be configured with strong authentication mechanisms and access controls to minimize the attack surface. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in network infrastructure devices. Organizations should also consider implementing network monitoring solutions that can detect anomalous command execution patterns and unauthorized configuration changes. The vulnerability highlights the importance of secure coding practices and proper input sanitization in embedded systems, particularly those handling network configuration interfaces. Given the nature of the flaw, it is recommended that all affected TOTOlink A7100RU devices be taken offline until proper patches are applied and security measures are implemented to prevent unauthorized access and potential exploitation.