📚 Main Topics

• Introduction to SSRF
• Mechanism of SSRF
• Example Scenario
• Mitigation Strategies
• Importance of Awareness

✨ Key Takeaways

• DefinitionServer Side Request Forgery (SSRF) is a security vulnerability that occurs when a web application fetches a remote resource without validating a user-supplied URL.
• New AdditionSSRF is a new entry in the 2021 OWASP Top 10 list, highlighted as a significant risk based on community feedback.
• Attack VectorAttackers can manipulate requests to access unintended endpoints, potentially bypassing firewalls and other security measures.

✨ Example Scenario

• In an online shopping application, a user checks if an item is in stock. The application sends a request to a backend API.
• An attacker can modify the request to point to a sensitive internal URL (e.g., /admin), allowing them to access restricted information that should not be exposed.

🧠 Mitigation Strategies

1. Network SegmentationIsolate remote resource functionalities into separate networks to limit the impact of SSRF.
2. Deny by Default PolicyImplement a firewall policy that denies all traffic by default, only allowing explicitly defined traffic.
3. LoggingLog all accepted and blocked network flows to monitor and analyze potential SSRF attempts.

🧠 Lessons Learned

• SSRF is increasingly relevant as applications become more complex and cloud-based services proliferate.
• Awareness and proactive measures are essential to mitigate the risks associated with SSRF.
• Continuous monitoring and logging are critical for identifying and responding to potential security threats.