CVE-2021-32769 : Exploit Details and Defense Strategies

This article provides an overview of CVE-2021-32769, a vulnerability found in micronaut-core versions prior to 2.5.9.

Understanding CVE-2021-32769

This section explores the details of the CVE-2021-32769 vulnerability in Micronaut.

What is CVE-2021-32769?

CVE-2021-32769 is a path traversal vulnerability in Micronaut versions before 2.5.9. It allows attackers to access files from the filesystem through specially crafted URLs, compromising confidentiality.

The Impact of CVE-2021-32769

The vulnerability poses a high severity risk with a CVSS base score of 7.5. Attackers can exploit the flaw to access unauthorized files, potentially leading to data breaches and privacy violations.

Technical Details of CVE-2021-32769

This section delves into the technical aspects of the CVE-2021-32769 vulnerability in Micronaut.

Vulnerability Description

The flaw arises due to Micronaut's lack of restriction on file access paths. By using

/../../

in URLs, attackers can navigate beyond configured directories and access sensitive files.

Affected Systems and Versions

Micronaut versions prior to 2.5.9 are impacted by this vulnerability. Users of affected versions should update to the patched version immediately.

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating URLs to traverse beyond the intended directory structure, gaining unauthorized access to files.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent the CVE-2021-32769 vulnerability in Micronaut.

Immediate Steps to Take

To mitigate the risk, users should upgrade to Micronaut version 2.5.9 or later. Additionally, avoid using

**

in mapping and opt for

*

to restrict access to directories.

Long-Term Security Practices

Implementing strict input validation, monitoring file access, and regular security audits can enhance the overall security posture of Micronaut applications.

Patching and Updates

Regularly check for security updates and apply patches promptly to safeguard against known vulnerabilities.