CVE-2021-21377 : Vulnerability Insights and Analysis

OMERO.web before version 5.9.0 is affected by an open redirect vulnerability that allows redirection to untrusted sites after login or group context switching. This article provides insights into the impact, technical details, and mitigation steps for CVE-2021-21377.

Understanding CVE-2021-21377

This section delves into the details of the open redirect vulnerability in OMERO.web.

What is CVE-2021-21377?

OMERO.web, an open-source Django-based software for managing microscopy imaging, is susceptible to open redirection to untrusted sites before version 5.9.0. The lack of URL validation allows malicious redirection post-login or group context changes.

The Impact of CVE-2021-21377

The CVSSv3.1 base score of 4.8 categorizes the severity as medium, with high confidentiality impact. Attackers can leverage this vulnerability for phishing attacks and spreading malware.

Technical Details of CVE-2021-21377

This section outlines specific technical aspects of the vulnerability.

Vulnerability Description

OMERO.web versions prior to 5.9.0 lack URL validation, enabling attackers to redirect users to malicious sites after login or group context alterations.

Affected Systems and Versions

OMERO.web versions below 5.9.0 are impacted by this vulnerability, making them vulnerable to open redirect exploitation.

Exploitation Mechanism

By manipulating URLs, threat actors can craft malicious links that abuse the lack of validation in OMERO.web, tricking users into visiting malicious sites.

Mitigation and Prevention

Protecting systems from CVE-2021-21377 involves immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade OMERO.web to version 5.9.0 or higher to mitigate the open redirect vulnerability.
Ensure cautious clicking on URLs and avoid suspicious links to mitigate risks.

Long-Term Security Practices

Implement URL validation mechanisms in web applications to thwart open redirect attacks.
Employ security headers like 'X-Frame-Options' and 'Content-Security-Policy' to enhance web security.

Patching and Updates

Regularly update and patch software to address known vulnerabilities and enhance overall system security.