CVE-2018-15351 in 24F2XG
Summary
by MITRE
Denial of service via crafting malicious link and sending it to a privileged user can cause Denial of Service in Kraftway 24F2XG Router firmware version 3.5.30.1118.
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Analysis
by VulDB Data Team • 03/16/2020
The vulnerability identified as CVE-2018-15351 represents a critical denial of service flaw within the Kraftway 24F2XG router firmware version 3.5.30.1118. This vulnerability arises from insufficient input validation mechanisms within the router's web interface processing subsystem, specifically when handling crafted hyperlinks submitted by authenticated users. The flaw manifests when a privileged user clicks on a maliciously constructed link, which triggers an unhandled exception in the router's HTTP request processing module. The vulnerability falls under the category of CWE-129 Input Validation and Output Encoding, specifically addressing improper validation of input data that leads to system instability.
The technical exploitation of this vulnerability occurs through a carefully crafted hyperlink that contains malformed parameters or unexpected input sequences designed to trigger buffer overflows or memory corruption within the router's embedded web server component. When the privileged user's browser navigates to the malicious link, the router's firmware processes the request without proper sanitization, causing the system to enter an undefined state where critical services become unavailable. The attack vector leverages the trust relationship between the router's web interface and authenticated users, making it particularly dangerous as it requires no elevated privileges beyond standard administrative access. This vulnerability aligns with ATT&CK technique T1499.004 Network Denial of Service, where adversaries leverage application-level flaws to exhaust system resources or cause process termination.
The operational impact of this vulnerability extends beyond simple service disruption, as it can lead to complete network outages for organizations relying on the affected router model. Network administrators may experience extended downtime while attempting to restore normal operations, as the router typically requires a complete reboot to recover from the denial of service condition. The vulnerability affects organizations with legacy network infrastructure where firmware updates may not be readily available or where update procedures are not regularly executed. The affected Kraftway 24F2XG router model represents a common enterprise-grade device that often serves as a primary gateway for network traffic, making the potential impact significant for business continuity. Organizations using this specific firmware version should consider implementing network segmentation strategies to limit the attack surface and prevent lateral movement if such a vulnerability is successfully exploited.
Mitigation strategies for this vulnerability include immediate firmware updates from the vendor when available, implementation of network access controls to restrict administrative access to trusted networks, and deployment of intrusion detection systems to monitor for suspicious link activity. Network administrators should also establish regular patch management procedures to ensure all network devices remain current with security updates. The vulnerability highlights the importance of input validation in embedded systems and demonstrates how seemingly benign web interface components can become attack vectors when proper security controls are not implemented. Organizations should conduct regular vulnerability assessments of their network infrastructure to identify similar flaws in other devices and implement comprehensive security monitoring to detect exploitation attempts. The incident underscores the critical need for robust software development practices and security testing of network equipment before deployment in production environments.