CVE-2017-17030 in QTS
Summary
by MITRE
A buffer overflow vulnerability in login function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117, 4.3.4.0387 (Beta 2) build 20171116 and earlier could allow remote attackers to execute arbitrary code on NAS devices.
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Analysis
by VulDB Data Team • 12/15/2019
The vulnerability identified as CVE-2017-17030 represents a critical buffer overflow flaw within the login function of QNAP QTS operating system versions up to 4.3.4.0387 Beta 2. This issue affects NAS devices running these specific firmware versions and creates a significant security risk for organizations relying on QNAP storage solutions. The buffer overflow occurs during the authentication process when the system fails to properly validate input length, creating a potential entry point for malicious actors to gain unauthorized access to network-attached storage devices.
This vulnerability stems from improper bounds checking in the authentication module where user credentials are processed during login attempts. The flaw allows attackers to craft specially formatted input that exceeds the allocated buffer space, causing memory corruption that can be exploited to execute arbitrary code with elevated privileges. The technical implementation lacks sufficient input validation mechanisms to prevent oversized data from being processed, which directly maps to CWE-121, Buffer Overflow in Stack-based Buffer. The attack vector is particularly concerning as it requires no authentication to exploit, making it accessible to remote attackers who can leverage the vulnerability from outside the network perimeter.
The operational impact of this vulnerability extends beyond simple unauthorized access, as successful exploitation can lead to complete system compromise and potential data exfiltration. Attackers can leverage this vulnerability to install backdoors, modify system files, or establish persistent access to the NAS device. The affected QNAP devices could serve as a foothold for broader network attacks, particularly in environments where these devices are connected to internal networks or exposed to external traffic. According to ATT&CK framework, this vulnerability aligns with T1078 Valid Accounts and T1059 Command and Scripting Interpreter techniques, as attackers could potentially use compromised devices to execute commands or establish persistence within the network infrastructure.
Organizations utilizing affected QNAP QTS versions should prioritize immediate remediation through firmware updates provided by QNAP. The vulnerability demonstrates the critical importance of maintaining up-to-date firmware and security patches, particularly for network-accessible devices. System administrators should implement network segmentation to limit exposure and monitor for unusual authentication attempts or network traffic patterns that might indicate exploitation attempts. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all potentially affected QNAP devices within their infrastructure and ensure proper access controls are implemented to minimize the attack surface. The vulnerability also highlights the need for regular security audits of network-attached storage solutions and proper input validation practices in authentication modules to prevent similar issues from occurring in the future.