CVE-2017-14000 in SkyRouter 4200
Summary
by MITRE
An Improper Authentication issue was discovered in Ctek SkyRouter Series 4200 and 4400, all versions prior to V6.00.11. By accessing a specific uniform resource locator (URL) on the web server, a malicious user is able to access the application without authenticating.
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Analysis
by VulDB Data Team • 11/22/2019
The CVE-2017-14000 vulnerability represents a critical improper authentication flaw in Ctek SkyRouter Series 4200 and 4400 devices, affecting all firmware versions prior to V6.00.11. This vulnerability stems from insufficient access control mechanisms within the web-based management interface of these network routers, creating a pathway for unauthorized users to bypass authentication protocols entirely. The flaw exists in the web server implementation where specific URL endpoints can be directly accessed without requiring valid credentials, fundamentally undermining the security model of the device's administrative interface.
This authentication bypass vulnerability falls under CWE-287, which specifically addresses improper authentication issues in software systems. The technical implementation flaw occurs at the application layer where the web server fails to properly validate user credentials before granting access to administrative functions. Attackers can exploit this weakness by simply navigating to predetermined URLs within the device's web interface, eliminating the need for brute force attacks or credential guessing. The vulnerability represents a classic case of insufficient input validation and access control enforcement, where the system assumes legitimate access based on URL traversal rather than proper authentication mechanisms.
The operational impact of this vulnerability is severe and multifaceted, as it allows attackers to gain full administrative control over affected routers without any authentication requirements. This unauthorized access enables malicious actors to modify router configurations, implement malicious network policies, redirect traffic, or establish backdoors for persistent access. The compromised devices can serve as entry points for broader network infiltration, potentially enabling attackers to pivot to internal network resources or launch further attacks against connected systems. Additionally, the vulnerability affects the integrity and confidentiality of network communications, as administrators lose control over their network infrastructure.
Organizations should immediately implement mitigations including firmware updates to version V6.00.11 or later, which address the authentication bypass vulnerability through proper credential validation mechanisms. Network segmentation and firewall rules should be implemented to restrict access to router management interfaces to trusted administrative networks only. Regular security assessments and network monitoring should be conducted to detect unauthorized access attempts. The vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation, as attackers can leverage this flaw to establish persistent access to network infrastructure. Continuous vulnerability management programs should be established to ensure timely patch deployment and prevent similar authentication flaws from compromising network security postures.