CVE-2021-35042 : Vulnerability Insights and Analysis

Django versions 3.1.x before 3.1.13 and 3.2.x before 3.2.5 are vulnerable to QuerySet.order_by SQL injection if the order_by parameter is derived from untrusted input. This vulnerability could be exploited by an attacker injecting malicious SQL code.

Understanding CVE-2021-35042

This section delves into the details of the CVE-2021-35042 vulnerability in Django.

What is CVE-2021-35042?

The CVE-2021-35042 vulnerability affects Django versions 3.1.x before 3.1.13 and 3.2.x before 3.2.5, allowing an attacker to perform a SQL injection attack through the order_by parameter in QuerySet. The vulnerability arises when untrusted input from a client is directly used to order the queryset in Django queries.

The Impact of CVE-2021-35042

Exploitation of this vulnerability could lead to unauthorized access to the database, data manipulation, data exfiltration, or even full system compromise. It poses a significant risk to the confidentiality, integrity, and availability of the affected Django applications.

Technical Details of CVE-2021-35042

This section covers the technical aspects of the CVE-2021-35042 vulnerability.

Vulnerability Description

The vulnerability in Django allows for SQL injection through the order_by parameter in QuerySet when it receives untrusted input. This could enable an attacker to manipulate the SQL query leading to malicious operations.

Affected Systems and Versions

Django versions 3.1.x before 3.1.13 and 3.2.x before 3.2.5 are impacted by this vulnerability. Users of these versions are advised to take immediate action to mitigate the risk.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting crafted SQL code into the order_by parameter. This can result in unauthorized database access and potentially allow the attacker to execute arbitrary SQL commands.

Mitigation and Prevention

Protecting systems from CVE-2021-35042 requires immediate action and the adoption of effective security practices.

Immediate Steps to Take

Update Django to versions 3.1.13 and 3.2.5 or newer where the vulnerability is patched.
Avoid passing unsanitized user input directly to QuerySet.order_by.

Long-Term Security Practices

Implement input validation and sanitize user inputs to prevent SQL injection attacks.
Regularly monitor security advisories and update Django libraries promptly.

Patching and Updates

Stay informed about security releases from Django and apply patches promptly to ensure that your systems are protected against known vulnerabilities.