CVE-2023-28115 : What You Need to Know

This CVE involves Snappy, a PHP library that allows thumbnail, snapshot, or PDF generation from a URL or an HTML page. The vulnerability allows for PHAR deserialization, enabling remote code execution.

Understanding CVE-2023-28115

The vulnerability in Snappy arises from a lack of protocol checking before passing it into the

file_exists()

function. Prior to version 1.4.2, Snappy is vulnerable to PHAR deserialization, which can be exploited by attackers to upload files of any type to the server and instantiate arbitrary PHP objects. This can lead to remote code execution, especially when Snappy is used with frameworks with vulnerable developer code.

What is CVE-2023-28115?

CVE-2023-28115 refers to the vulnerability in Snappy that allows for PHAR deserialization, potentially leading to remote code execution. It affects versions of Snappy prior to 1.4.2.

The Impact of CVE-2023-28115

The impact of this vulnerability is critical, with a CVSS v3.1 base score of 9.8. It has high impacts on confidentiality, integrity, and availability, with low attack complexity.

Technical Details of CVE-2023-28115

The vulnerability in Snappy can be described as a lack of protocol checking before passing data into the

file_exists()

function, allowing for PHAR deserialization. Affected systems include Snappy versions prior to 1.4.2.

Vulnerability Description

The vulnerability in Snappy allows for PHAR deserialization due to improper protocol handling, enabling attackers to upload files of any type and execute arbitrary PHP code remotely.

Affected Systems and Versions

Snappy versions prior to 1.4.2 are affected by this vulnerability, making them susceptible to remote code execution through PHAR deserialization.

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading files with the

phar://

protocol, enabling them to unserialize the uploaded file and instantiate PHP objects, leading to remote code execution.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-28115, immediate steps should be taken to secure vulnerable systems and prevent potential exploitation.

Immediate Steps to Take

Immediate steps to mitigate this vulnerability include updating Snappy to version 1.4.2 or later, implementing proper input validation and sanitization, and monitoring for any suspicious activities.

Long-Term Security Practices

In the long term, it is essential to follow secure coding practices, conduct regular security audits, and stay informed about potential vulnerabilities in third-party libraries used in software development.

Patching and Updates

The vulnerability in Snappy has been addressed in version 1.4.2. It is crucial for users to apply patches and updates provided by the vendor promptly to protect their systems from potential exploits.