EUVD-2024-52306

Comprehensive Technical Analysis of EUVD-2024-52306

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in ClipBucket V5, specifically in versions 2.0 to 5.5.1 Revision 199, is a PHP Deserialization vulnerability. This type of vulnerability allows an attacker to inject maliciously crafted serialized objects, which can lead to arbitrary code execution or other malicious behaviors. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical risk. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H highlights the following characteristics:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Privileges Required (PR): None (N) - No special privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
• Scope (S): Unchanged (U) - The vulnerability does not change the security scope.
• Confidentiality (C): High (H) - The vulnerability can lead to a significant breach of confidentiality.
• Integrity (I): High (H) - The vulnerability can lead to a significant breach of integrity.
• Availability (A): High (H) - The vulnerability can lead to a significant breach of availability.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves exploiting the decode_key function in upload/photo_upload.php, which processes user inputs without proper sanitization. An attacker can craft a malicious serialized PHP object and pass it through the collection GET parameter or the photoIDS POST parameter. The decode_key function then invokes the unserialize function, which can lead to the execution of arbitrary code if the serialized object contains malicious payloads.

Potential exploitation methods include:

• Remote Code Execution (RCE): By injecting a serialized object that triggers gadget chains, an attacker can execute arbitrary code on the server.
• Denial of Service (DoS): Crafting a serialized object that causes the application to crash or consume excessive resources.
• Data Exfiltration: Extracting sensitive information by manipulating the serialized object to return data from the server.

3. Affected Systems and Software Versions

The vulnerability affects ClipBucket V5 versions 2.0 to 5.5.1 Revision 199. The issue is resolved in version 5.5.1 Revision 200. Organizations using any of the affected versions are at risk and should prioritize updating to the patched version.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Update to the Latest Version: Immediately update ClipBucket V5 to version 5.5.1 Revision 200 or later.
• Input Validation and Sanitization: Ensure that all user inputs are properly validated and sanitized before processing.
• Disable Unserialize Function: If possible, disable the use of the unserialize function or replace it with safer alternatives.
• Web Application Firewall (WAF): Deploy a WAF to detect and block malicious input patterns.
• Regular Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability in ClipBucket V5 poses a significant risk to organizations within the European Union that rely on this software for video hosting. Given the critical nature of the vulnerability, it could lead to widespread data breaches, service disruptions, and potential legal implications under GDPR if sensitive user data is compromised. Organizations must act swiftly to patch the vulnerability and implement robust security measures to protect against similar threats in the future.

6. Technical Details for Security Professionals

• Vulnerable Function: decode_key in upload/photo_upload.php
• Affected Parameters: collection (GET) and photoIDS (POST)
• Exploitation Path: The decode_key function calls unserialize on user-supplied input, leading to potential RCE.
• Patch Information: The vulnerability is fixed in ClipBucket V5 version 5.5.1 Revision 200.
• References:
  • GitHub Security Advisory: GHSA-4523-mqmv-wrqx
  • Patch Commit: 76a829c088f0813ab3244a3bd0036111017409b0

By understanding the technical details and implementing the recommended mitigation strategies, organizations can effectively protect their systems from this critical vulnerability.