CVE-2018-20718 : Security Advisory and Response

Pydio before version 8.2.2 is vulnerable to PHP Object Injection due to a syntax issue that allows attackers to store preferences using $phpserial$a:0:{}.

Understanding CVE-2018-20718

This CVE involves a security vulnerability in Pydio that can lead to PHP Object Injection.

What is CVE-2018-20718?

Prior to version 8.2.2 of Pydio, a vulnerability exists where users can utilize a specific syntax to store preferences, potentially leading to PHP Object Injection. Attackers need access to a public link of a file or an unprivileged user account to exploit this vulnerability.

The Impact of CVE-2018-20718

The vulnerability allows attackers to execute remote code by injecting malicious PHP objects into the application, potentially compromising the system's security.

Technical Details of CVE-2018-20718

Pydio's vulnerability to PHP Object Injection can have severe consequences if exploited.

Vulnerability Description

The issue arises from the improper handling of user preferences using the $phpserial$a:0:{} syntax, enabling attackers to inject malicious PHP objects.

Affected Systems and Versions

Pydio versions prior to 8.2.2 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by gaining access to a public link of a file or an unprivileged user account to create the link.

Mitigation and Prevention

Protecting systems from CVE-2018-20718 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Pydio to version 8.2.2 or newer to mitigate the vulnerability.
Monitor and restrict access to public links within the application.

Long-Term Security Practices

Implement secure coding practices to prevent PHP Object Injection vulnerabilities.
Regularly update and patch Pydio to address security issues.
Conduct security audits and penetration testing to identify and remediate vulnerabilities.