CVE-2017-6392 in Kaltura Server
Summary
by MITRE
An issue was discovered in Kaltura server Lynx-12.11.0. The vulnerability exists due to insufficient filtration of user-supplied data passed to the "server-Lynx-12.11.0/admin_console/web/tools/XmlJWPlayer.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.
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Analysis
by VulDB Data Team • 09/03/2020
The vulnerability identified as CVE-2017-6392 represents a critical cross-site scripting flaw within the Kaltura server Lynx-12.11.0 administration console. This security weakness resides in the XmlJWPlayer.php component which processes user input without adequate sanitization measures, creating an exploitable pathway for malicious actors to inject harmful code into the web application's response. The vulnerability specifically affects the administrative interface of the Kaltura media platform, which is widely used for content management and video streaming services in enterprise environments. The flaw stems from the application's failure to properly validate and filter input parameters passed through the targeted URL endpoint, allowing attackers to manipulate the application's behavior through crafted requests.
The technical exploitation of this vulnerability enables an attacker to inject arbitrary HTML and JavaScript code into the browser context of authenticated users who access the affected administration console. This cross-site scripting condition occurs because the server-side script does not adequately sanitize user-supplied data before incorporating it into dynamically generated web content. The vulnerability falls under the Common Weakness Enumeration category CWE-79, which specifically addresses cross-site scripting flaws in web applications. When successfully exploited, the malicious code executes within the victim's browser session with the privileges of the authenticated user, potentially allowing attackers to perform actions such as viewing sensitive administrative data, modifying configuration settings, or even escalating their privileges within the system. The attack vector is particularly dangerous because it targets the administration console, which typically grants users elevated access rights and system-level privileges.
The operational impact of this vulnerability extends beyond simple code injection, as it provides attackers with potential access to sensitive administrative functions within the Kaltura platform. Organizations relying on this media management system could face unauthorized access to their video content, user data, and system configurations. The vulnerability is particularly concerning in enterprise environments where Kaltura servers often handle confidential media assets and user information. Attackers could leverage this flaw to gain unauthorized access to administrative controls, potentially leading to complete system compromise. The risk is amplified by the fact that the vulnerability affects the administration console, which typically requires authentication, making successful exploitation more impactful. This weakness creates a persistent threat vector that could be exploited repeatedly by attackers who gain access to the vulnerable system, potentially leading to data breaches, service disruption, or unauthorized modifications to the media platform's configuration.
The recommended mitigations for CVE-2017-6392 involve implementing comprehensive input validation and output encoding mechanisms within the affected Kaltura server components. Organizations should immediately apply the vendor-provided security patches or updates that address this specific vulnerability in the Lynx-12.11.0 release. The implementation of proper parameter sanitization techniques, including the use of context-appropriate encoding methods such as HTML entity encoding for output rendering, would prevent the execution of malicious scripts. Additionally, organizations should consider implementing web application firewalls and security monitoring solutions that can detect and block suspicious input patterns targeting known vulnerabilities. The security posture should also include regular vulnerability assessments and penetration testing to identify similar weaknesses within the broader application ecosystem. According to ATT&CK framework, this vulnerability maps to T1059.007 for scripting and T1190 for exploitation of vulnerabilities, highlighting the need for comprehensive defensive measures that address both the immediate threat and broader attack surface considerations. System administrators should also implement network segmentation and access controls to limit the potential impact of successful exploitation attempts.