CVE-2017-17029 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 buffer overflow vulnerability identified as CVE-2017-17029 affects the login function of QNAP QTS operating systems, representing a critical security flaw that enables remote code execution on affected NAS devices. This vulnerability specifically targets the authentication mechanism of the QNAP QTS platform, which is widely deployed in enterprise and consumer environments for network-attached storage solutions. The affected versions include QTS 4.2.6 build 20171026, 4.3.3.0378 build 20171117, 4.3.4.0387 Beta 2 build 20171116, and earlier releases, indicating a widespread exposure across multiple product lines within the QNAP ecosystem. The vulnerability stems from inadequate input validation within the login function, where user-supplied data is not properly sanitized before being processed, creating an exploitable condition that allows attackers to manipulate memory structures.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In this case, the login function fails to properly validate the length of authentication credentials provided by users, particularly username and password fields. When malicious input exceeds the allocated buffer space, it overflows into adjacent memory regions, potentially allowing attackers to overwrite return addresses, function pointers, or other critical program state information. The exploitability of this condition is enhanced by the fact that the vulnerability exists in a network-accessible service, specifically the web-based login interface, which means remote attackers can trigger the overflow without requiring physical access to the device.
From an operational perspective, this vulnerability presents a severe risk to organizations relying on QNAP NAS devices for critical data storage and file sharing operations. Successful exploitation could result in complete system compromise, allowing attackers to execute arbitrary code with the privileges of the affected service account, typically root or administrator level access. The implications extend beyond simple unauthorized access, as compromised NAS devices often contain sensitive corporate data, personal information, and backup files that could be exfiltrated or modified by attackers. The vulnerability's presence in multiple QNAP QTS versions indicates a prolonged exposure window, potentially allowing attackers to target installations that have not been updated, particularly in environments where patch management processes are inadequate or delayed.
Organizations should implement immediate mitigations including prompt deployment of QNAP's security patches, which address the buffer overflow through proper input validation and bounds checking mechanisms. Network segmentation and access control measures should be strengthened to limit exposure of affected devices to untrusted networks, while monitoring systems should be configured to detect unusual authentication patterns or failed login attempts that might indicate exploitation attempts. The vulnerability's classification under the ATT&CK framework would fall under T1210 - Exploitation of Remote Services, specifically targeting authentication services through buffer overflow techniques. Additionally, organizations should conduct comprehensive vulnerability assessments to identify other potentially affected QNAP devices within their infrastructure and establish robust patch management procedures to prevent similar vulnerabilities from arising in the future, considering that the root cause involves fundamental input validation failures that could affect other components of the system.