CVE-2021-45116 Explained : Impact and Mitigation

An issue was discovered in Django 2.2 before 2.2.26, 3.2 before 3.2.11, and 4.0 before 4.0.1. This vulnerability in the dictsort template filter could lead to information disclosure or unintended method calls if a crafted key is exploited.

Understanding CVE-2021-45116

What is CVE-2021-45116?

CVE-2021-45116 is a vulnerability found in Django versions 2.2 to 4.0 that could potentially result in information disclosure or unintended code execution.

The Impact of CVE-2021-45116

The vulnerability in the dictsort template filter of Django versions could allow malicious actors to access confidential information or perform unauthorized actions in affected systems.

Technical Details of CVE-2021-45116

Vulnerability Description

The issue stems from the variable resolution logic of Django's Template Language, making the dictsort filter susceptible to exploitation when provided with a specifically crafted key.

Affected Systems and Versions

Django versions 2.2 to 4.0 are impacted by this vulnerability.

Exploitation Mechanism

By manipulating the key passed to the dictsort filter, attackers can trigger the vulnerability, potentially leading to data exposure or unintended function calls.

Mitigation and Prevention

Immediate Steps to Take

Users are advised to update Django to versions 2.2.26, 3.2.11, or 4.0.1 to patch the vulnerability.
Regularly monitor for any unusual activities on Django-based applications.

Long-Term Security Practices

Conduct security audits and code reviews to identify and address potential vulnerabilities.

Patching and Updates

Stay informed about security updates and apply patches promptly to mitigate known vulnerabilities.