CVE-2018-0712 in QTS
Summary
by MITRE
Command injection vulnerability in LDAP Server in QNAP QTS 4.2.6 build 20171208, QTS 4.3.3 build 20180402, QTS 4.3.4 build 20180413 and their earlier versions could allow remote attackers to run arbitrary commands or install malware on the NAS.
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Analysis
by VulDB Data Team • 03/28/2023
The vulnerability identified as CVE-2018-0712 represents a critical command injection flaw within the Lightweight Directory Access Protocol server implementation of QNAP QTS operating systems. This security weakness affects multiple versions including QTS 4.2.6 build 20171208, QTS 4.3.3 build 20180402, and QTS 4.3.4 build 20180413 along with their earlier releases, creating a widespread exposure across QNAP network-attached storage devices. The flaw resides in how the LDAP server component processes user input, specifically failing to properly sanitize or validate parameters passed through LDAP queries which enables malicious actors to execute arbitrary commands on the affected systems.
This command injection vulnerability stems from inadequate input validation mechanisms within the LDAP server implementation, allowing attackers to inject malicious commands through specially crafted LDAP requests. The technical flaw manifests when user-supplied data is directly incorporated into system command execution without proper sanitization, creating a pathway for remote code execution. The vulnerability operates at the application layer and can be exploited through network-based attacks without requiring authentication, making it particularly dangerous as it allows unauthenticated remote attackers to gain full control over the affected NAS devices. The flaw maps to CWE-77 which specifically addresses command injection vulnerabilities, where unsafe execution of commands based on user input creates opportunities for attackers to manipulate system behavior.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete control over the affected NAS systems, enabling them to install malware, exfiltrate data, or establish persistent backdoors. Network-attached storage devices serve as critical data repositories for both personal and enterprise users, making this vulnerability particularly attractive to threat actors seeking to compromise sensitive information. The remote exploitation capability means that attackers can target these devices from anywhere on the internet, potentially affecting thousands of QNAP devices that are exposed to public networks. Organizations relying on QNAP NAS systems for file storage, backup services, and directory services face significant risk of data breaches, system compromise, and potential lateral movement within their networks.
Mitigation strategies for CVE-2018-0712 should prioritize immediate firmware updates from QNAP to address the underlying command injection vulnerability. Network administrators should implement firewall rules to restrict access to LDAP ports and consider disabling LDAP services if not actively required. The principle of least privilege should be enforced by limiting access to the affected systems and monitoring for suspicious LDAP activity. Additionally, organizations should conduct comprehensive vulnerability assessments to identify other potential attack vectors and ensure proper network segmentation to limit the impact of any successful exploitation attempts. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter, specifically targeting the execution of malicious commands through system interfaces.