CVE-2023-41277 in QTS
Summary
by MITRE • 02/02/2024
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 administrators to execute code via a network.
We have already fixed the vulnerability in the following versions: QTS 5.1.2.2533 build 20230926 and later QuTS hero h5.1.2.2534 build 20230927 and later QuTScloud c5.1.5.2651 and later
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Analysis
by VulDB Data Team • 02/25/2024
This vulnerability represents a classic buffer overflow condition that occurs when input data exceeds the allocated buffer size without proper validation. The flaw exists within QNAP's operating system implementations where insufficient bounds checking allows maliciously crafted input to overwrite adjacent memory regions. The vulnerability specifically affects authenticated administrator accounts, which means exploitation requires prior access to administrative credentials, but the impact remains severe as it enables arbitrary code execution. The affected systems include multiple QNAP operating system variants including QTS, QuTS hero, and QuTScloud platforms, indicating a widespread issue across the company's product lineup. This type of vulnerability falls under CWE-121 which describes stack-based buffer overflow conditions, and it aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage in exploitation scenarios. The buffer copy without size validation creates a predictable attack surface where an authenticated user can manipulate input parameters to overwrite critical memory locations, potentially leading to privilege escalation or complete system compromise.
The operational impact of this vulnerability extends beyond simple code execution as it fundamentally undermines the security model of QNAP devices. Administrators who believe their systems are secure due to proper access controls may unknowingly expose themselves to remote code execution capabilities when handling input validation. The exploitation requires network-based access and authentication, making it moderately difficult to exploit but not impossible, particularly in environments where administrative credentials may be compromised through phishing, credential reuse, or other attack vectors. The vulnerability affects QNAP's web-based management interfaces and potentially command-line utilities, creating multiple potential attack paths for threat actors. Organizations running affected versions should consider the risk of lateral movement within their networks, as compromised administrative accounts could provide attackers with elevated privileges to access additional systems. The vulnerability's presence in multiple product variants suggests that QNAP's codebase shares common components that require centralized patching rather than individual fixes for each platform.
The mitigation strategy centers on immediate deployment of the patched versions mentioned in the advisory, with QTS 5.1.2.2533 build 20230926 and later representing the minimum required version for protection. Organizations should prioritize updating QuTS hero systems to version h5.1.2.2534 build 20230927 and later, while QuTScloud installations must reach version c5.1.5.2651 or higher. Beyond patch management, system administrators should implement additional security controls including network segmentation, monitoring for anomalous administrative activity, and regular credential rotation. The fix addresses the core buffer overflow condition by implementing proper input validation and size checking mechanisms, preventing malicious input from exceeding allocated buffer boundaries. Security teams should also consider implementing intrusion detection systems to monitor for exploitation attempts and establish incident response procedures for potential compromise scenarios. The vulnerability highlights the importance of proper input validation in security-critical applications and demonstrates how even authenticated administrative interfaces can contain exploitable conditions. Organizations should conduct comprehensive vulnerability assessments to identify any other potential buffer overflow conditions within their QNAP deployments and ensure that all administrative interfaces follow secure coding practices. The remediation process should include thorough testing of the patched systems to verify that legitimate administrative functions remain operational while the vulnerability is eliminated.