CVE-2021-32555 : What You Need to Know

A vulnerability, identified as CVE-2021-32555, has been discovered in the 'apport' package on Ubuntu. The vulnerability allows the 'read_file()' function in 'apport/hookutils.py' to follow maliciously constructed symbolic links, which can lead to exposing private data to other local users.

Understanding CVE-2021-20657

This section delves into the details of the vulnerability and its impact.

What is CVE-2021-20657?

The CVE-2021-20657 vulnerability arises from the 'read_file()' function in 'apport/hookutils.py' on Ubuntu traversing symbolic links or opening FIFOs. When utilized by the 'xorg-hwe-18.04' package apport hooks, it could potentially disclose sensitive data to unauthorized local users.

The Impact of CVE-2021-20657

The high severity vulnerability poses a significant risk to confidentiality, with a CVSS v3.1 base score of 7.3. It has a low attack complexity and vector, requiring low privileges and no user interaction. While the integrity impact is none, the potential availability impact is low, indicating limited consequences.

Technical Details of CVE-2021-20657

Explore the technical aspects of CVE-2021-20657 to understand its occurrence and implications.

Vulnerability Description

The vulnerability allows attackers to exploit symbolic links in 'apport/hookutils.py', potentially granting unauthorized access to private data of other local users who have access to the affected system.

Affected Systems and Versions

The CVE-2021-20657 vulnerability affects specific versions of the 'apport' package on Ubuntu, including versions 2.20.1, 2.20.9, 2.20.11-0ubuntu27, 2.20.11-0ubuntu50, and 2.20.11-0ubuntu65.

Exploitation Mechanism

Attackers can exploit the vulnerability by constructing malicious symbolic links, tricking the 'read_file()' function to traverse them and potentially gain access to private data.

Mitigation and Prevention

Learn about the necessary steps to mitigate the CVE-2021-20657 vulnerability and prevent similar security risks in the future.

Immediate Steps to Take

Users are advised to apply the security patch provided by Canonical promptly. Additionally, monitor for any unusual file activities or unauthorized access attempts.

Long-Term Security Practices

Implement a robust security policy that includes regular security updates, user privilege management, and access control mechanisms to prevent unauthorized data access.

Patching and Updates

Regularly check for security updates from Ubuntu and promptly apply patches to ensure the system is protected against known vulnerabilities.