CVE-2022-28577 in A7100RU
Summary
by MITRE • 05/05/2022
It is found that there is a command injection vulnerability in the delParentalRules 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 vulnerability identified as CVE-2022-28577 represents a critical command injection flaw within the TOTOlink A7100RU router firmware version v7.4cu.2313_b20191024. This vulnerability specifically affects the delParentalRules interface, which is designed to manage parental control rules on the device. The flaw arises from insufficient input validation and sanitization mechanisms within the router's web interface, creating an avenue for malicious actors to inject and execute arbitrary commands on the underlying operating system. The vulnerability stems from the router's failure to properly sanitize user-supplied parameters before processing them within system commands, allowing attackers to manipulate the command execution flow through crafted input payloads.
The technical implementation of this vulnerability places it firmly within the CWE-77 category, which specifically addresses command injection flaws in software systems. This weakness enables attackers to execute arbitrary commands with the privileges of the web server process or the router's system user, potentially leading to complete system compromise. The delParentalRules interface appears to directly incorporate user input into system command execution without proper sanitization, creating a direct path for command injection attacks. Attackers can exploit this by crafting malicious payloads that contain shell metacharacters and command separators, which then get executed by the router's underlying operating system. The vulnerability's impact is amplified by the fact that it operates at the application layer within the router's web administration interface, making it accessible through standard network protocols without requiring physical access to the device.
The operational impact of this vulnerability extends far beyond simple command execution, as it provides attackers with complete control over the affected router's functionality. An attacker who successfully exploits this vulnerability can gain unauthorized access to the router's configuration files, modify network settings, redirect traffic, and potentially establish persistent backdoors within the network infrastructure. The compromised router can then serve as a pivot point for lateral movement within the network, enabling attackers to target other connected devices and systems. This vulnerability particularly affects enterprise and home networks where the router serves as a critical gateway component, potentially allowing attackers to disrupt network services, intercept communications, or use the compromised device for further malicious activities such as botnet recruitment or as a launch point for attacks against external targets. The vulnerability's exploitation can lead to data breaches, network disruption, and unauthorized access to sensitive network resources.
Mitigation strategies for CVE-2022-28577 should prioritize immediate firmware updates from TOTOlink, as the vendor has likely released patches addressing this specific vulnerability. Network administrators should implement network segmentation and access controls to limit the potential impact of a successful exploitation, while also monitoring network traffic for suspicious command execution patterns. The implementation of web application firewalls and input validation mechanisms can provide additional defense-in-depth layers, though these may not be sufficient against this specific vulnerability without proper firmware updates. Regular security assessments and vulnerability scanning of network infrastructure should include checks for outdated firmware versions that may contain similar command injection vulnerabilities. Organizations should also consider implementing network monitoring solutions that can detect anomalous command execution patterns or unauthorized configuration changes that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of keeping network device firmware up to date and implementing proper input validation across all network management interfaces, aligning with ATT&CK framework techniques that emphasize privilege escalation and command execution through web application vulnerabilities.