CVE-2021-28153 : Security Advisory and Response

An issue was discovered in GNOME GLib before 2.66.8 where using g_file_replace() with G_FILE_CREATE_REPLACE_DESTINATION to replace a dangling symlink incorrectly creates the target as an empty file. This could pose security risks if the symlink is controlled by an attacker.

Understanding CVE-2021-28153

This CVE identifies a vulnerability in GNOME GLib that could potentially lead to security issues if exploited.

What is CVE-2021-28153?

The vulnerability stems from incorrect behavior when g_file_replace() is used with specific parameters, resulting in the creation of an empty file.

The Impact of CVE-2021-28153

If the symlink being replaced is controlled by an attacker, this vulnerability could potentially be exploited to create empty files, raising security concerns.

Technical Details of CVE-2021-28153

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from the incorrect creation of an empty file when replacing a dangling symlink using g_file_replace().

Affected Systems and Versions

The issue affects GNOME GLib versions before 2.66.8.

Exploitation Mechanism

Attackers could potentially exploit this vulnerability to create empty files when replacing specific symlinks.

Mitigation and Prevention

Explore the steps necessary to mitigate and prevent potential exploitation of CVE-2021-28153.

Immediate Steps to Take

It's crucial to update GNOME GLib to version 2.66.8 or above to address this vulnerability.

Long-Term Security Practices

Practicing secure coding, regular security audits, and staying informed about security updates are essential for long-term security.

Patching and Updates

Regularly check for security updates and apply patches promptly to protect systems from known vulnerabilities.