CVE-2018-13324 in TS5600D1206
Summary
by MITRE
Incorrect access control in nasapi in Buffalo TS5600D1206 version 3.61-0.10 allows attackers to bypass authentication by sending a modified HTTP Host header.
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Analysis
by VulDB Data Team • 04/14/2020
The vulnerability identified as CVE-2018-13324 represents a critical access control flaw within the nasapi component of Buffalo TS5600D1206 network-attached storage device running firmware version 3.61-0.10. This issue stems from inadequate validation of the HTTP Host header parameter during the authentication process, creating a pathway for unauthorized access to the storage system. The flaw exists in the application layer where the system fails to properly verify the legitimacy of the Host header value, allowing malicious actors to manipulate this parameter to bypass the authentication mechanism entirely.
The technical implementation of this vulnerability resides in the nasapi service's handling of HTTP requests where the system relies on the Host header for determining access permissions. When an attacker crafts a modified Host header value, the system incorrectly processes this input without proper validation checks, leading to authentication bypass conditions. This weakness specifically manifests when the application fails to implement proper input sanitization and validation routines for HTTP headers, particularly the Host field which should normally be restricted to authorized domains or IP addresses. The vulnerability falls under the category of improper access control as defined by CWE-285, which addresses situations where systems fail to properly enforce access restrictions.
The operational impact of this vulnerability is severe as it provides attackers with complete unauthorized access to the network-attached storage system. Once bypassed, attackers can access all stored data, modify file permissions, delete critical information, and potentially escalate privileges within the network. The vulnerability affects the confidentiality, integrity, and availability of the storage system, as unauthorized users can read sensitive data, corrupt files, or disrupt storage operations. This flaw particularly impacts organizations relying on Buffalo TS5600D1206 devices for file sharing and data storage, as it essentially renders the authentication mechanism ineffective.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework where it maps to the privilege escalation and defense evasion techniques. The attack vector leverages HTTP header manipulation, which aligns with techniques involving protocol manipulation and application layer attacks. Organizations should implement immediate mitigations including firmware updates from Buffalo to address the root cause, network segmentation to limit access to storage systems, and monitoring of HTTP Host header values for suspicious patterns. Additionally, implementing proper input validation controls and restricting HTTP header manipulation through web application firewalls would provide layered defense against similar attacks. The vulnerability demonstrates the critical importance of validating all user inputs, including HTTP headers, as outlined in OWASP Top 10 and other security standards that emphasize proper access control implementation.