CVE-2025-21624 is a critical file upload vulnerability affecting ClipBucket V5, an open-source video hosting solution. The vulnerability exists in the Manage Playlist functionality, enabling an attacker to upload a PHP script file instead of a legitimate image file. This flaw allows for the storage and execution of webshells or other malicious files on the server. The risk is compounded as this vulnerability is present in both the admin and low-level user areas of the application.
With a CVSS score of 9.8, the severity of this vulnerability is classified as critical. The attack vector is through the network, requiring low complexity and no privileges or user interaction. The impact is significant, affecting confidentiality, integrity, and availability. Organizations utilizing unpatched versions of ClipBucket are at a heightened risk of exploitation.
The vulnerability is fixed in version 5.5.1 - 239. Organizations should prioritize upgrading to this version immediately to mitigate risks associated with potential remote code execution.
Given the critical nature of this vulnerability, organizations must take immediate steps to patch their systems. Failure to do so may result in unauthorized access and significant data breaches.
Vulnerability Details
This vulnerability allows an attacker to exploit the file upload functionality in ClipBucket V5, specifically around the uploading of playlist cover images. The lack of proper validation checks enables the uploading of potentially harmful files, leading to significant security risks.
The vulnerability is formally classified under CWE-434, which pertains to file upload vulnerabilities. The critical nature of this flaw necessitates immediate remediation to prevent exploitation.
Technical Analysis
The root cause of this vulnerability lies in the inadequate validation of uploaded files. An attacker can bypass security measures by uploading a PHP script disguised as an image file. This vulnerability is exploitable through a network attack, requiring no prior privileges or user interaction, making it particularly dangerous.
Attack complexity is low, as the vulnerability does not require advanced skills to exploit. The confidentiality, integrity, and availability impacts are all rated high due to the potential for unauthorized access and control over the application.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data and the ability to execute arbitrary code on the server. The blast radius for this vulnerability is extensive, affecting both administrative and user-level access, leading to broader implications for organizational security.
Given the critical CVSS score and the potential for exploitation, organizations should prioritize patching immediately. The urgency is underscored by the fact that this vulnerability is not currently listed in the KEV catalog, indicating it may not yet be widely recognized in the threat landscape.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of ClipBucket include all releases prior to 5.5.1 - 239. Organizations must ensure they upgrade to this version or newer to mitigate against potential exploitation.
Mitigation & Remediation
To remediate this vulnerability, organizations should immediately upgrade to ClipBucket version 5.5.1 - 239. If an upgrade is not feasible, implementing file upload restrictions to allow only specific file types can serve as a temporary workaround. Additionally, organizations should harden their configurations and monitor upload logs for any suspicious activity.
For comprehensive security, organizations should consider engaging in penetration testing to assess their security posture and identify potential vulnerabilities.
Detection Guidance
Organizations should monitor logs for unusual file uploads and track any changes made to the playlist management functionality. Implementing network monitoring to detect anomalies can also provide insights into potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-21624 highlights the need for robust file upload validation across applications. Organizations should review their upload functionalities and implement stringent checks to prevent similar vulnerabilities.
This incident represents a larger trend of file upload vulnerabilities leading to severe security breaches. Security teams must prioritize enhancing their application security measures.
For further insights, organizations can explore best practices in web application penetration testing and consider regular security assessments to maintain their security posture.
Lastly, organizations should engage with third-party experts, such as those found in penetration testing methodology, to ensure comprehensive risk management.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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