UUIDs Alone Don't Prevent IDOR Security Vulnerabilities
By
8organicbits
Fresh out the oven, still warm. Top of the tray.
Summary
This technical article explains why using UUIDs (Universally Unique Identifiers) alone does not provide adequate security protection against IDOR (Insecure Direct Object Reference) vulnerabilities. The author demonstrates through code examples how web applications can still be vulnerable to unauthorized access even when using UUIDs, particularly when separate storage services like Amazon S3 buckets are involved. The article focuses on security best practices and common pitfalls in access control implementation.
Key quotes
· 4 pulledIndirect Object Reference (IDOR) occurs when a resource can be accessed directly by its ID even when the user does not have proper authorization to access it.
IDOR is a common mistake when using a separate service for storing files, such as a publicly readable Amazon S3 bucket.
The web application may perform access control checks correctly, but the storage service does not.
# Vulnerable! @login_required def view_latest_bill(request): bill
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