CVE-2020-23015 : What You Need to Know

An open redirect issue was discovered in OPNsense through version 20.1.5, allowing the redirect parameter "url" on the login page to redirect users to any website.

Understanding CVE-2020-23015

This CVE involves an open redirect vulnerability in OPNsense, potentially leading to unauthorized redirection of users to malicious websites.

What is CVE-2020-23015?

An open redirect vulnerability in OPNsense allows attackers to craft URLs that redirect users to malicious websites.

The Impact of CVE-2020-23015

This vulnerability could be exploited by attackers to trick users into visiting malicious websites, leading to potential phishing attacks or the download of malware.

Technical Details of CVE-2020-23015

This section provides technical details about the vulnerability.

Vulnerability Description

The issue lies in the lack of filtering of the "url" parameter on the login page, enabling attackers to redirect users to any website.

Affected Systems and Versions

Affected System: OPNsense
Affected Versions: Up to and including 20.1.5

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the "url" parameter in the login page URL to redirect users to malicious sites.

Mitigation and Prevention

Protect your systems from CVE-2020-23015 with these mitigation strategies.

Immediate Steps to Take

Apply the latest security patches from OPNsense.
Educate users about the risks of clicking on unverified links.

Long-Term Security Practices

Implement URL filtering mechanisms to prevent open redirects.
Regularly monitor and audit URL redirection mechanisms.

Patching and Updates

Ensure that your OPNsense installation is up to date with the latest patches to mitigate the open redirect vulnerability.