CVE-2019-7197 in QTS
Summary
by MITRE
A stored cross-site scripting (XSS) vulnerability has been reported to affect multiple versions of QTS. If exploited, this vulnerability may allow an attacker to inject and execute scripts on the administrator console. To fix this vulnerability, QNAP recommend updating QTS to the latest version.
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Analysis
by VulDB Data Team • 12/05/2019
The CVE-2019-7197 vulnerability represents a critical stored cross-site scripting flaw within QTS (QNAP Turbo Server) operating systems that affects multiple versions of the QNAP NAS (Network Attached Storage) platform. This vulnerability resides in the web-based administration interface of the QTS operating system, creating a persistent security risk that can be exploited by malicious actors to gain unauthorized access to administrative functions. The flaw allows attackers to inject malicious scripts into the system through user input fields that are not properly sanitized, making it particularly dangerous as the malicious code persists in the system and executes whenever the affected page is accessed.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the QTS web interface components. When administrators or users interact with certain web forms or configuration pages, the system fails to properly sanitize user-supplied data before storing it within the application's database or configuration files. This stored data is then later retrieved and displayed without proper HTML escaping or context-appropriate encoding, creating the conditions for XSS exploitation. The vulnerability specifically impacts the administrative console where sensitive operations are performed, making it particularly attractive to attackers seeking to escalate privileges or gain persistent access to networked storage systems.
The operational impact of CVE-2019-7197 extends far beyond simple script execution, as it provides attackers with the ability to fully compromise administrative access to QNAP NAS devices. Once exploited, attackers can manipulate the system configuration, access stored data, create or modify user accounts, and potentially establish persistent backdoors within the network infrastructure. This vulnerability directly violates the principle of least privilege and can lead to complete network compromise, especially in environments where QNAP devices serve as central storage repositories for sensitive corporate or personal data. The stored nature of the vulnerability means that even if the initial attack vector is patched, the malicious scripts remain active until the affected system is properly updated and the stored content is cleared.
Security professionals should recognize this vulnerability as a classic example of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is categorized under the OWASP Top Ten as a critical web application security risk. The attack surface is particularly concerning given that QNAP devices are commonly deployed in both enterprise and home network environments where they serve as primary storage solutions and may contain highly sensitive information. Organizations using QTS versions affected by CVE-2019-7197 should immediately implement the vendor-recommended mitigation strategy of updating to the latest QTS firmware version, while also monitoring network traffic for potential exploitation attempts. Additionally, implementing web application firewalls and regular security assessments of networked storage devices can provide additional layers of protection against similar vulnerabilities that may arise in the future.