CVE-2015-9104 in Audio Station
Summary
by MITRE
Cross-site scripting (XSS) vulnerabilities in Synology Audio Station 5.1 before 5.1-2550 and 5.4 before 5.4-2857 allows remote authenticated attackers to inject arbitrary web script or HTML via the album title.
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Analysis
by VulDB Data Team • 10/21/2019
The vulnerability identified as CVE-2015-9104 represents a critical cross-site scripting flaw affecting Synology Audio Station software versions prior to specific patches. This vulnerability resides within the web interface of the audio management application, specifically in how it processes and displays album title data submitted by authenticated users. The flaw enables remote attackers who have gained valid credentials to execute malicious scripts within the context of other users' browsers, creating a significant security risk for organizations relying on Synology's network-attached storage solutions. The vulnerability is classified under CWE-79 as a failure to sanitize user input before incorporating it into web pages, making it a classic XSS attack vector that can be exploited for session hijacking, data theft, and unauthorized actions within the application's context.
The technical implementation of this vulnerability occurs when the Audio Station application fails to properly sanitize or escape user-supplied album title information before rendering it in web pages. When an authenticated attacker submits an album title containing malicious script code, the application processes this input without adequate validation or encoding, allowing the malicious payload to be executed when other users view the affected album listings. This flaw particularly affects the web-based administrative interface where users can manage their music libraries, making it accessible to anyone with valid login credentials. The vulnerability demonstrates poor input validation practices and highlights the importance of implementing proper output encoding mechanisms to prevent script injection attacks.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged for more sophisticated attacks within the network environment. An attacker with access to the Audio Station application can potentially steal session cookies, redirect users to malicious websites, or execute unauthorized actions on behalf of legitimate users. This risk is particularly concerning for enterprise environments where Synology devices serve as central storage solutions for sensitive data. The vulnerability affects both version 5.1 before 2550 and 5.4 before 2857, indicating a widespread issue across multiple release branches of the software, which suggests that the root cause was not adequately addressed in the codebase. The attack vector requires only authenticated access, making it accessible to internal users or those who have obtained legitimate credentials through other means.
Organizations should implement immediate mitigations including applying the vendor-provided patches released for versions 5.1-2550 and 5.4-2857, which address the input sanitization issues in the album title handling functionality. Network segmentation and access controls should be enforced to limit who can access the Audio Station application, while monitoring should be implemented to detect suspicious activity related to album title modifications. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage, as attackers can leverage the XSS flaw to execute malicious scripts within user browsers. Regular security assessments should include validation of input handling mechanisms in web applications, and organizations should consider implementing web application firewalls to detect and prevent such injection attacks. The incident underscores the critical importance of proper input validation and output encoding practices in web application development, particularly for applications that process user-generated content.