CVE-2016-4848 in ClipBucket
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in ClipBucket before 2.8.1 RC2 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 09/14/2022
The CVE-2016-4848 vulnerability represents a critical cross-site scripting flaw discovered in ClipBucket version 2.8.0 and earlier, prior to the release of version 2.8.1 RC2. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws identified by the CWE organization. ClipBucket is a widely used open-source video sharing platform that allows users to upload, manage, and share video content, making it a prime target for attackers seeking to exploit client-side vulnerabilities. The vulnerability's presence in a video sharing platform is particularly concerning as it could enable attackers to execute malicious code within the context of other users' browsers, potentially leading to session hijacking, data theft, or unauthorized actions on behalf of victims.
The technical nature of this vulnerability stems from insufficient input validation and output encoding mechanisms within the ClipBucket application. Attackers can exploit this weakness by injecting malicious scripts or HTML code through unspecified vectors within the application's data handling processes. These unspecified vectors likely encompass various user input fields, including but not limited to video titles, descriptions, comments, user profiles, or any other data entry points that the application processes and displays to other users. The vulnerability manifests when the application fails to properly sanitize or encode user-supplied data before rendering it in web pages, allowing malicious payloads to be executed in the context of other users' browsers. This flaw operates at the application layer where user-generated content is processed and presented, making it a classic example of a client-side injection vulnerability.
The operational impact of this vulnerability extends beyond simple script execution, as it creates a persistent threat vector that can be exploited by attackers with varying skill levels. Successful exploitation could enable attackers to steal session cookies, redirect users to malicious websites, deface the platform, or perform unauthorized actions such as posting malicious content or modifying user accounts. The vulnerability's remote nature means that attackers do not require physical access to the system or local network privileges to exploit it, making it particularly dangerous for public-facing applications like ClipBucket. Users who browse the platform could unknowingly execute malicious code simply by viewing infected content, while administrators might be at risk if they inadvertently click on malicious links within the application's interface. The potential for mass impact exists due to the platform's user base and the nature of video sharing communities where users frequently interact with content and comments.
Mitigation strategies for CVE-2016-4848 should focus on implementing robust input validation and output encoding mechanisms throughout the ClipBucket application. The most effective approach involves applying proper HTML escaping and sanitization to all user-supplied content before rendering it in web pages, which aligns with the defensive techniques recommended in the ATT&CK framework for preventing client-side attacks. Organizations should ensure that all user inputs are properly validated against a whitelist of acceptable characters and patterns, while implementing Content Security Policy headers to limit the execution of unauthorized scripts. The immediate solution involves upgrading to ClipBucket version 2.8.1 RC2 or later, which contains the necessary patches to address the XSS vulnerability. Additionally, implementing regular security audits, input sanitization routines, and maintaining up-to-date security monitoring systems can help prevent similar vulnerabilities from emerging in the future. Security-conscious administrators should also consider implementing web application firewalls and regular penetration testing to identify and remediate potential attack vectors before they can be exploited by malicious actors.