CVE-2021-26034 : Exploit Details and Defense Strategies

An issue was discovered in Joomla! 3.0.0 through 3.9.26 that causes a CSRF vulnerability in data download endpoints in com_banners and com_sysinfo.

Understanding CVE-2021-26034

This CVE relates to a CSRF vulnerability found in Joomla! CMS versions 3.0.0 through 3.9.26, impacting the security of data download endpoints in com_banners and com_sysinfo.

What is CVE-2021-26034?

The CVE-2021-26034 vulnerability is a Cross-Site Request Forgery (CSRF) flaw that allows attackers to perform unauthorized actions through forged HTTP requests, potentially leading to compromised data integrity and security breaches.

The Impact of CVE-2021-26034

This vulnerability in Joomla! CMS versions 3.0.0 through 3.9.26 can result in malicious exploitation by attackers to manipulate data download endpoints in com_banners and com_sysinfo, posing a risk to the confidentiality and integrity of the system.

Technical Details of CVE-2021-26034

The technical aspects of CVE-2021-26034 include:

Vulnerability Description

The CSRF vulnerability arises from a missing token check in Joomla! 3.0.0 through 3.9.26, which can be exploited by attackers through data download endpoints in com_banners and com_sysinfo.

Affected Systems and Versions

Joomla! CMS versions 3.0.0 through 3.9.26 are affected by this vulnerability, potentially exposing systems to CSRF attacks in the context of data downloads.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious HTTP requests to trigger unauthorized actions in the affected Joomla! CMS versions, compromising the security of data download functionalities.

Mitigation and Prevention

To address CVE-2021-26034, consider the following security measures:

Immediate Steps to Take

Update Joomla! CMS to a patched version that addresses the CSRF vulnerability.
Monitor data download actions for suspicious or unauthorized activities in com_banners and com_sysinfo.

Long-Term Security Practices

Implement robust CSRF protection mechanisms in web applications to prevent exploitation.
Regularly audit and review data download functionalities for security gaps and vulnerabilities.

Patching and Updates

Stay informed about security advisories from Joomla! Project and promptly apply patches and updates to mitigate known vulnerabilities like CSRF in data download endpoints.