CVE-2021-27375 : What You Need to Know

Traefik before 2.4.5 allows the loading of IFRAME elements from other domains.

Understanding CVE-2021-27375

This CVE describes a vulnerability in Traefik before version 2.4.5 that enables the loading of IFRAME elements from external domains.

What is CVE-2021-27375?

CVE-2021-27375 is a security flaw in Traefik that permits the loading of IFRAME components from different domains, potentially leading to cross-origin attacks.

The Impact of CVE-2021-27375

This vulnerability could be exploited by malicious actors to execute cross-site scripting (XSS) attacks, bypass security restrictions, or steal sensitive information from users interacting with the affected application.

Technical Details of CVE-2021-27375

The technical details of CVE-2021-27375 include:

Vulnerability Description

Traefik versions prior to 2.4.5 are susceptible to allowing the loading of IFRAME elements from external domains, posing a security risk to users.

Affected Systems and Versions

All versions of Traefik before 2.4.5 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious IFRAME elements that could execute unauthorized actions on the user's behalf.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27375, users and administrators are advised to take the following actions:

Immediate Steps to Take

Update Traefik to version 2.4.5 or later to eliminate the vulnerability.
Monitor network traffic for any signs of unauthorized IFRAME elements loading.

Long-Term Security Practices

Implement content security policies (CSP) to restrict the loading of external resources.
Regularly audit and review the security configurations of Traefik to identify and address any vulnerabilities.

Patching and Updates

Ensure that Traefik is consistently updated to the latest version to patch known security issues and protect against potential threats.