CVE-2021-24761 Explained : Impact and Mitigation

WordPress plugin Error Log Viewer before version 1.1.2 is susceptible to an Arbitrary Text File Deletion vulnerability. Attackers can exploit this issue to make a logged-in admin delete arbitrary text files on the web server.

Understanding CVE-2021-24761

This CVE describes a vulnerability in the Error Log Viewer plugin by BestWebSoft that could allow for arbitrary text file deletion through Cross-Site Request Forgery (CSRF) attacks.

What is CVE-2021-24761?

The Error Log Viewer WordPress plugin before version 1.1.2 lacks nonce check during log file deletion and does not prevent path traversal, enabling attackers to manipulate an admin user to unintentionally delete crucial text files on the server.

The Impact of CVE-2021-24761

This vulnerability could lead to unauthorized deletion of critical text files, compromising the integrity and availability of the web server and its contents.

Technical Details of CVE-2021-24761

The technical details of CVE-2021-24761 include:

Vulnerability Description

The vulnerability arises from the lack of nonce check during log file deletion and absence of path traversal prevention in the Error Log Viewer plugin.

Affected Systems and Versions

Error Log Viewer plugin versions prior to 1.1.2 are affected by this vulnerability.

Exploitation Mechanism

Attackers can craft CSRF attacks to manipulate logged-in admin users into unknowingly deleting arbitrary text files on the server.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24761, consider the following steps:

Immediate Steps to Take

Update the Error Log Viewer plugin to version 1.1.2 or later to address the vulnerability.
Restrict admin privileges and access to minimize the impact of CSRF attacks.

Long-Term Security Practices

Regularly monitor and audit file operations on the server to detect any unauthorized modifications.
Educate users on identifying and avoiding CSRF attacks through security awareness training.

Patching and Updates

Ensure timely application of security patches and updates to all installed plugins and software to prevent exploitation of known vulnerabilities.