CVE-2020-9402 Overview
CVE-2020-9402 is a SQL Injection vulnerability affecting Django versions 1.11 before 1.11.29, 2.2 before 2.2.11, and 3.0 before 3.0.4. The vulnerability allows SQL Injection when untrusted data is used as a tolerance parameter in GIS (Geographic Information System) functions and aggregates on Oracle database backends. By passing a suitably crafted tolerance value to these GIS functions, an attacker can break escaping mechanisms and inject malicious SQL commands.
Critical Impact
Authenticated attackers with network access can inject arbitrary SQL commands through GIS tolerance parameters, potentially leading to unauthorized data access, data modification, or complete database compromise on Oracle backends.
Affected Products
- Django versions 1.11.x before 1.11.29
- Django versions 2.2.x before 2.2.11
- Django versions 3.0.x before 3.0.4
- Debian Linux 9.0 and 10.0
- Fedora 31 and 32
- Canonical Ubuntu Linux 16.04 ESM, 18.04 LTS, and 19.10
- NetApp SteelStore Cloud Integrated Storage
Discovery Timeline
- March 4, 2020 - Django Project releases security patches
- March 5, 2020 - CVE-2020-9402 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2020-9402
Vulnerability Analysis
This SQL Injection vulnerability exists within Django's GIS framework when used with Oracle database backends. The core issue stems from improper handling of the tolerance parameter in GIS-related functions and aggregates. When user-controlled data is passed as a tolerance value without adequate sanitization, attackers can craft malicious input that breaks out of the intended SQL context and executes arbitrary database commands.
The vulnerability is particularly concerning because GIS functionality is commonly used in applications handling geographic data, such as mapping services, location-based applications, and spatial data analysis platforms. Oracle databases are frequently deployed in enterprise environments where sensitive data is stored.
Root Cause
The root cause of CVE-2020-9402 is insufficient input validation and improper escaping of the tolerance parameter within Django's GIS backend for Oracle. The tolerance parameter, which is typically a numeric value used for spatial calculations, was not being properly sanitized before being incorporated into SQL queries. This allowed specially crafted tolerance values containing SQL syntax to escape the parameter context and inject additional SQL statements.
Django's GIS module provides various spatial database functions and aggregates that accept tolerance parameters. When these functions construct SQL queries for Oracle backends, the tolerance value was directly interpolated into the query string without proper parameterization or escaping, violating SQL Injection prevention best practices.
Attack Vector
The attack vector requires network access and low-level privileges (authenticated user access). An attacker must be able to supply input that reaches GIS functions accepting tolerance parameters in a Django application using Oracle as its database backend.
The exploitation process involves identifying application endpoints or features that utilize Django GIS functions with user-controllable tolerance values. The attacker then crafts a malicious tolerance parameter containing SQL injection payload that breaks out of the numeric context and injects arbitrary SQL commands.
For example, in applications allowing users to specify precision or tolerance for geographic queries, an attacker could supply a tolerance value containing SQL syntax to extract sensitive data, modify database contents, or execute administrative database operations depending on the application's database permissions.
Technical details and exploitation techniques can be found in the Django Security Releases Documentation and the Django Weblog Security Announcement.
Detection Methods for CVE-2020-9402
Indicators of Compromise
- Unusual SQL error messages in application logs related to GIS functions or Oracle database queries
- Database query logs showing malformed tolerance parameters with SQL syntax characters such as quotes, semicolons, or UNION statements
- Unexpected database access patterns or data exfiltration attempts from Oracle backends
- Application errors in GIS-related functionality that may indicate injection attempts
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect SQL Injection patterns in GIS-related request parameters
- Monitor application logs for tolerance parameter values containing non-numeric characters or SQL keywords
- Deploy database activity monitoring to detect anomalous queries originating from Django GIS functions
- Use static application security testing (SAST) tools to identify code paths where user input flows into GIS tolerance parameters
Monitoring Recommendations
- Enable detailed logging for Django applications, particularly for database query operations involving GIS modules
- Configure Oracle database auditing to capture queries from the Django application user account
- Set up alerting for SQL errors that may indicate injection attempts, including ORA-00936 (missing expression) or ORA-00933 (SQL command not properly ended)
- Monitor for data access patterns inconsistent with normal GIS query operations
How to Mitigate CVE-2020-9402
Immediate Actions Required
- Upgrade Django to patched versions: 1.11.29, 2.2.11, or 3.0.4 or later immediately
- Audit application code for GIS functions that accept user-controlled tolerance parameters
- Implement input validation to ensure tolerance parameters are strictly numeric before passing to GIS functions
- Review database permissions for Django application accounts and apply principle of least privilege
Patch Information
Django has released security patches addressing this vulnerability. Users should upgrade to the following minimum versions:
- Django 1.11.x users: Upgrade to 1.11.29 or later
- Django 2.2.x users: Upgrade to 2.2.11 or later
- Django 3.0.x users: Upgrade to 3.0.4 or later
Patches are available through the official Django project and package repositories. For distribution-specific patches, refer to:
Workarounds
- Validate all user input for GIS tolerance parameters, ensuring only numeric values are accepted before processing
- Implement application-layer filtering to reject tolerance parameter values containing non-numeric characters
- Consider temporarily disabling GIS functionality that accepts user-controlled tolerance parameters until patches can be applied
- Use parameterized queries or Django's ORM query methods that properly escape values when building custom GIS queries
# Upgrade Django to patched version
pip install --upgrade Django>=3.0.4
# Or for specific version tracks:
pip install Django==1.11.29 # For 1.11.x users
pip install Django==2.2.11 # For 2.2.x users
pip install Django==3.0.4 # For 3.0.x users
# Verify installed version
python -c "import django; print(django.get_version())"
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