CVE-2020-2491 in QTS
Summary
by MITRE • 12/10/2020
This cross-site scripting vulnerability in Photo Station allows remote attackers to inject malicious code. QANP We have already fixed this vulnerability in the following versions of Photo Station. QTS 4.5.1: Photo Station 6.0.12 and later QTS 4.4.3: Photo Station 6.0.12 and later QTS 4.3.6: Photo Station 5.7.12 and later QTS 4.3.4: Photo Station 5.7.13 and later QTS 4.3.3: Photo Station 5.4.10 and later QTS 4.2.6: Photo Station 5.2.11 and later
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Analysis
by VulDB Data Team • 12/15/2020
This cross-site scripting vulnerability identified as CVE-2020-2491 resides within the Photo Station component of QNAP's QTS operating system, presenting a significant security risk to users who rely on this media management platform. The vulnerability stems from insufficient input validation and output encoding mechanisms within the Photo Station web interface, allowing remote attackers to inject malicious script code into web pages viewed by other users. This flaw specifically affects the application's handling of user-supplied data in parameters or form fields that are subsequently rendered without proper sanitization, creating an environment where malicious payloads can execute within the context of other users' browsers.
The technical exploitation of this vulnerability occurs through the manipulation of input parameters that are processed by Photo Station's web server components. Attackers can craft malicious payloads that, when submitted through vulnerable input fields or URL parameters, get stored or reflected in the application's response. These payloads typically consist of javascript code or other scripting languages that can execute in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability operates under CWE-79 which classifies it as a classic cross-site scripting flaw, specifically categorized as reflected XSS when the malicious input is immediately reflected back to users without proper encoding.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities within the compromised user sessions. Remote attackers could leverage this vulnerability to steal user authentication cookies, execute unauthorized actions on behalf of victims, or redirect users to phishing sites designed to capture credentials. The affected versions span multiple QTS releases, indicating this was a widespread issue affecting various generations of QNAP's operating system, making it particularly concerning for organizations that maintain legacy systems or have delayed security updates. This vulnerability directly maps to several techniques documented in the MITRE ATT&CK framework under the T1059.007 category for script injection, and potentially T1566 for initial access through web application attacks.
Organizations affected by this vulnerability should immediately implement the vendor-provided patches and updates, specifically targeting Photo Station versions 6.0.12 and later for QTS 4.5.1, 6.0.12 and later for QTS 4.4.3, 5.7.12 and later for QTS 4.3.6, 5.7.13 and later for QTS 4.3.4, 5.4.10 and later for QTS 4.3.3, and 5.2.11 and later for QTS 4.2.6. Additional mitigations should include implementing web application firewalls to detect and block suspicious script payloads, conducting thorough input validation on all user-supplied data, and regularly monitoring for unusual network traffic patterns that might indicate exploitation attempts. Security teams should also consider implementing content security policies to limit script execution within the application environment, and perform comprehensive vulnerability assessments to identify any other potential XSS vulnerabilities within the QNAP ecosystem. Regular security awareness training for administrators and users can help prevent social engineering attacks that might exploit this vulnerability.