CVE-2024-54135

Comprehensive Technical Analysis of CVE-2024-54135

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-54135 CVSS Score: 9.8

The vulnerability in ClipBucket V5, specifically in versions 2.0 to 5.5.1 Revision 199, is a PHP Deserialization issue. This type of vulnerability is critical because it allows an attacker to inject maliciously crafted serialized objects, which can lead to arbitrary code execution or other malicious behaviors. The high CVSS score of 9.8 indicates the severity of the vulnerability, reflecting its potential for significant impact on affected systems.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unsanitized User Input: The vulnerability arises from unsanitized user inputs supplied to the decode_key function via the collection GET parameter and photoIDS POST parameter.
• PHP Unserialize Function: The decode_key function invokes the unserialize function, which is a common attack vector for deserialization vulnerabilities.

Exploitation Methods:

• Gadget Chains: An attacker can exploit this vulnerability by crafting a serialized PHP object that, when deserialized, triggers a chain of method calls (gadget chains) leading to arbitrary code execution or other malicious actions.
• Remote Code Execution (RCE): By injecting a specially crafted serialized object, an attacker can achieve RCE, allowing them to execute arbitrary commands on the server.

3. Affected Systems and Software Versions

Affected Versions:

• ClipBucket V5 versions 2.0 to 5.5.1 Revision 199

Fixed Version:

• The vulnerability is fixed in ClipBucket V5 5.5.1 Revision 200.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade to the Latest Version: Upgrade to ClipBucket V5 5.5.1 Revision 200 or later to mitigate the vulnerability.
• Input Sanitization: Ensure that all user inputs are properly sanitized and validated before being processed by the application.
• Disable Unserialize Function: If possible, disable or restrict the use of the unserialize function in the application.

Long-Term Strategies:

• Code Review: Conduct a thorough code review to identify and mitigate similar vulnerabilities.
• Security Training: Provide security training for developers to understand the risks associated with deserialization and other common vulnerabilities.
• Regular Updates: Implement a regular update and patch management process to ensure that the software is kept up-to-date with the latest security patches.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Widespread Use: ClipBucket is a popular open-source video hosting platform, and its widespread use means that this vulnerability could affect a large number of users and organizations.
• Exploit Availability: The availability of exploit details and patches in public repositories increases the risk of exploitation by malicious actors.
• Supply Chain Risks: Organizations using ClipBucket as part of their video hosting solutions need to be aware of the potential risks to their supply chain and take appropriate measures to mitigate them.

6. Technical Details for Security Professionals

Vulnerable Code:

• The vulnerability exists in upload/photo_upload.php within the decode_key function.
• The decode_key function invokes the unserialize function as defined in upload/includes/classes/photos.class.php.

Exploit Details:

• The collection GET parameter and photoIDS POST parameter are not properly sanitized, allowing an attacker to inject a malicious serialized object.
• The unserialize function processes this object, leading to potential RCE or other malicious behaviors.

Patch Information:

• The vulnerability is fixed in ClipBucket V5 5.5.1 Revision 200. The patch can be reviewed at the following GitHub commit: Patch.

References:

• GitHub Security Advisory

Conclusion

CVE-2024-54135 is a critical PHP Deserialization vulnerability in ClipBucket V5 that can lead to arbitrary code execution. Organizations using affected versions should immediately upgrade to the patched version and implement robust input sanitization and validation practices. The broader cybersecurity community should be aware of the potential risks and take proactive measures to mitigate similar vulnerabilities in their applications.