"Escape-Proof" Cloud: How Block built an Automated Approach to Egress Control

Many organizations focus on keeping attackers out, but what happens when one gets in? We spoke to Ramesh Ramani, Staff Security Engineer at Block about the real challenge, which is preventing them from leaving with your data. In this episode, Ramesh details the innovative system his team built to automate egress access control at scale, moving beyond traditional, inefficient methods.

Ramesh explains how by establishing "sources of truth" for both internal applications and external partners, they created a centralized governance model. This system uses SPIFFE IDs to understand application identity, validates data-sharing requests against partner approvals, and provides a seamless, self-service experience for developers. Discover how this approach not only enhances security by preventing unauthorized data exfiltration but also improves incident response, allowing them to instantly revoke access to compromised third-party domains.

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Questions asked:

(00:00) - Introduction(00:55) - Ramesh Ramani's Journey: From Network Engineer to Cloud Security at Block(02:03) - The "Trapped Thief" Analogy: Why Egress Is a Critical, Overlooked Problem(04:07) - The Trigger for Automation: Why Traditional Egress Security Doesn't Scale(07:36) - The Secret Sauce: Using SPIFFE IDs for Application Identity Across Any Cloud(14:42) - How It Works: Requesting Access & Denying Leaks to Partners like ChatGPT(30:39) - The Foundation: Why You Must Start with a "Source of Truth" for Apps & Partners(31:23) - Incident Response: Instantly Cutting Off Access When a Partner is Compromised(33:58) - Rollout Strategy: How to Implement Egress Controls Without Burdening Other Teams(37:35) - The Fun Section: Tech, Family, RPGs, and the Best Vegetarian Ramen

Resources discussed during the episode:

BSidesSF 2025 - Centralizing Egress Access Controls Across a Hybrid Environment.