Beyond the Login: Stopping Unauthorised Access in Your Web Apps
- JULY 28TH, 2025
- 1min read
Introduction
Access control abuse, including Insecure Direct Object Reference (IDOR) vulnerabilities, enables attackers to bypass permission checks and gain unauthorised access to sensitive functions or data. This could potentially lead to severe consequences like data breaches or system compromise. A global data leak in October 2021, exposing mobile phone data from hundreds of thousands of devices via insecure “stalkerware” apps, serves as a stark example of such access control abuse.
Detection Techniques
- Monitor user activity for unusual patterns, such as a regular user attempting to access administrative resources.
- Implement comprehensive logging for all access control decisions and regularly review them for suspicious attempts.
- Track user actions against their assigned roles, triggering alerts if higher-privilege activities are attempted.
- Look for signs of attackers manipulating input parameters to bypass access control checks.
- Utilise Security Information and Event Management (SIEM) tools to centralise and correlate security logs for comprehensive analysis.
Mitigation Strategies
- Design access controls based on the principle of least privilege, granting only necessary permissions.
- Implement a “deny by default” principle, explicitly permitting only authorised actions.
- Use robust, well-tested authorisation frameworks (e.g. Spring Security in Java, Passport.js in Node.Js applications etc.) instead of custom, error-prone mechanisms.
- Employ unique, unpredictable identifiers for resources to prevent Insecure Direct Object Reference (IDOR) vulnerabilities.
- Conduct regular security audits, penetration testing, and automated scanning to identify and fix access control flaws.
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