CVE-2023-50362 in QTS
Summary
by MITRE • 04/26/2024
A buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow authenticated users to execute code via a network.
We have already fixed the vulnerability in the following versions: QTS 5.1.6.2722 build 20240402 and later QuTS hero h5.1.6.2734 build 20240414 and later
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Analysis
by VulDB Data Team • 09/11/2024
This vulnerability represents a classic buffer overflow condition that occurs when the QNAP operating system fails to validate the size of input data during copy operations. The flaw exists within the system's handling of network-based authenticated user requests, where insufficient bounds checking allows maliciously crafted input to overwrite adjacent memory locations. Such vulnerabilities fall under the CWE-121 category of buffer overflow conditions, specifically manifesting as stack-based buffer overflows that can be exploited through network protocols. The vulnerability affects multiple QNAP operating system variants including QTS and QuTS hero platforms, indicating a systemic issue within the software architecture rather than isolated component failure.
The technical exploitation of this vulnerability requires an authenticated user context, which significantly reduces the attack surface compared to unauthenticated exploits but still presents a substantial risk to networked systems. Attackers can leverage this condition to execute arbitrary code with the privileges of the affected service account, potentially leading to complete system compromise. The buffer overflow occurs during network protocol handling where user-supplied data is copied into fixed-size buffers without proper validation of input length. This allows attackers to overwrite critical memory regions including return addresses and function pointers, enabling code execution control flow manipulation. The vulnerability aligns with ATT&CK technique T1059.007 for command and script injection, as successful exploitation would allow attackers to execute malicious payloads.
The operational impact of this vulnerability extends beyond immediate system compromise to include potential data exfiltration, persistence mechanisms, and lateral movement capabilities within networked environments. Organizations utilizing affected QNAP systems face significant risk of unauthorized access and potential data breaches, particularly in environments where these devices serve as network storage or file sharing platforms. The vulnerability affects versions prior to QTS 5.1.6.2722 build 20240402 and QuTS hero h5.1.6.2734 build 20240414, indicating that the fix addresses the root cause through proper input validation and bounds checking mechanisms. System administrators should prioritize patching affected systems, as the vulnerability can be exploited remotely by authenticated users who have legitimate access to the system. The remediation process requires careful consideration of system availability during patch deployment, particularly in mission-critical environments where QNAP devices serve essential storage functions.
Security monitoring should focus on detecting unusual network traffic patterns, authentication attempts, and system behavior changes that might indicate exploitation attempts. The vulnerability demonstrates the importance of input validation and defensive programming practices, particularly in network-facing applications. Organizations should implement comprehensive patch management processes to ensure all QNAP devices receive timely security updates, as this vulnerability represents a potential pathway for attackers to establish persistent access to networked storage systems. The fix implemented in the newer versions includes proper size validation checks and memory boundary enforcement that prevent the buffer overflow condition from occurring during normal operation. This vulnerability underscores the critical need for regular security assessments of network infrastructure devices and the importance of maintaining current security patches across all system components.