CVE-2021-3851 Explained : Impact and Mitigation

A detailed overview of the CVE-2021-3851 vulnerability affecting firefly-iii/firefly-iii.

Understanding CVE-2021-3851

In this section, we will delve into what CVE-2021-3851 is, its impact, technical details, and mitigation strategies.

What is CVE-2021-3851?

The CVE-2021-3851 vulnerability involves URL Redirection to an Untrusted Site within the firefly-iii/firefly-iii application. Attackers could exploit this to redirect users to malicious websites.

The Impact of CVE-2021-3851

With a CVSS base score of 5 (Medium Severity), this vulnerability has a HIGH attack complexity and requires user interaction. It poses a risk of low confidentiality, integrity, and availability impact.

Technical Details of CVE-2021-3851

Let's explore the specifics of the vulnerability in terms of description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

firefly-iii/firefly-iii is prone to URL Redirection to Untrusted Site, potentially leading to malicious redirects.

Affected Systems and Versions

The vulnerability affects firefly-iii/firefly-iii versions earlier than 5.6.2.

Exploitation Mechanism

Attackers can exploit this vulnerability over a network without requiring privileges, making it critical for user interaction.

Mitigation and Prevention

To secure your systems against CVE-2021-3851, immediate steps, long-term security practices, and the importance of patching and updates are essential.

Immediate Steps to Take

Ensure user vigilance, avoid clicking on unverified links, and monitor for any suspicious activity.

Long-Term Security Practices

Regular security training, awareness programs, and thorough code reviews can help prevent such vulnerabilities.

Patching and Updates

Update firefly-iii/firefly-iii to version 5.6.2 or later to mitigate the risk of URL Redirection vulnerabilities.