CVE-2017-18372 in Billion 5200W-T
Summary
by MITRE
The Billion 5200W-T TCLinux Fw $7.3.8.0 v008 130603 router distributed by TrueOnline has a command injection vulnerability in the Time Setting function, which is only accessible by an authenticated user. The vulnerability is in the tools_time.asp page and can be exploited through the uiViewSNTPServer parameter. Authentication can be achieved by exploiting CVE-2017-18373.
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Analysis
by VulDB Data Team • 09/11/2023
The CVE-2017-18372 vulnerability represents a critical command injection flaw within the Billion 5200W-T TCLinux firmware version 7.3.8.0 v008 130603 router implementation. This vulnerability exists within the Time Setting functionality of the router's web interface, specifically targeting the tools_time.asp page. The flaw manifests through the uiViewSNTPServer parameter, which fails to properly sanitize user input before processing. The vulnerability requires authenticated access, making it less immediately exploitable than unauthenticated flaws, but still poses significant risk to network security. The affected device is distributed by TrueOnline, indicating this vulnerability could impact a substantial number of users within their network infrastructure.
The technical execution of this vulnerability falls under CWE-77, which describes command injection vulnerabilities where untrusted data is incorporated into system commands without proper validation or sanitization. Attackers can exploit this by crafting malicious input within the uiViewSNTPServer parameter that gets executed as shell commands on the underlying TCLinux system. This creates a pathway for arbitrary code execution with the privileges of the web application process, potentially allowing attackers to gain full control over the router's functionality. The vulnerability's presence in the Time Setting function is particularly concerning as it represents a legitimate administrative interface that users might regularly access, making exploitation more likely.
Operationally, this vulnerability creates substantial risk for organizations and individuals relying on the affected router models. The authenticated nature of the exploit means that an attacker must first obtain valid credentials through the related CVE-2017-18373 vulnerability, which typically involves exploiting weak authentication mechanisms or credential management issues. Once authenticated, the command injection allows for complete compromise of the router's administrative functions, enabling attackers to modify network settings, redirect traffic, install malicious firmware, or use the device as a pivot point for further attacks within the local network. The impact extends beyond simple network disruption to potential data exfiltration and persistent backdoor establishment, aligning with ATT&CK technique T1059 for command and script interpreter execution.
Mitigation strategies for CVE-2017-18372 should prioritize immediate firmware updates from the vendor, as this vulnerability affects specific firmware versions that likely contain patches. Network administrators should implement strict access controls and authentication measures, including multi-factor authentication for router administration interfaces, to reduce the likelihood of unauthorized access. The implementation of network segmentation and firewall rules to restrict access to router management interfaces from untrusted networks provides additional defense-in-depth. Regular security audits and vulnerability assessments should include checks for outdated firmware versions, while monitoring for unusual network traffic patterns or unauthorized configuration changes can help detect exploitation attempts. Organizations should also consider implementing network access control policies that limit administrative access to only trusted personnel and systems, reducing the attack surface for such vulnerabilities. The vulnerability highlights the importance of maintaining current firmware versions and implementing robust network security practices to protect against authenticated command injection attacks.