CVE-2021-32553 : Security Advisory and Response

A vulnerability, known as CVE-2021-32553, was discovered in the 'apport' package in Ubuntu. This CVE allows a malicious actor to expose private data to other local users.

Understanding CVE-2021-32553

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-32553.

What is CVE-2021-32553?

The vulnerability lies in the 'read_file()' function within 'apport/hookutils.py' that follows symbolic links or open FIFOs, potentially leading to private data exposure.

The Impact of CVE-2021-32553

With a CVSS base score of 7.3, this vulnerability has a high severity level due to its ability to expose confidential information to unauthorized local users.

Technical Details of CVE-2021-32553

Let's delve deeper into the technical aspects of CVE-2021-32553.

Vulnerability Description

The vulnerability arises from improper handling of symbolic links and FIFOs in the 'read_file()' function, creating a pathway for private data exposure.

Affected Systems and Versions

The 'apport' versions less than '2.20.1-0ubuntu2.30+esm1', '2.20.9-0ubuntu7.24', '2.20.11-0ubuntu27.18', '2.20.11-0ubuntu50.7', '2.20.11-0ubuntu65.1', and '2.14.1-0ubuntu3.29+esm7' are susceptible to this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by manipulating the symbolic links and FIFOs to gain unauthorized access to sensitive information.

Mitigation and Prevention

Protecting systems against CVE-2021-32553 requires immediate action and long-term security practices.

Immediate Steps to Take

Update the 'apport' package to versions that are not vulnerable to CVE-2021-32553. Additionally, restrict access to critical systems to trusted users only.

Long-Term Security Practices

Establish proper file access controls, regularly monitor for unusual file activities, and educate users on the risks associated with following symbolic links.

Patching and Updates

Regularly apply security patches and updates to the 'apport' package to mitigate the risk of data exposure through symbolic links and FIFOs.