DEF CON 33 - Not Just a Pipeline Leak: Reconstructing Real Attack Behind tj-actions - Aviad Hahami
Source: YouTube · DEFCONConference · published Oct 10, 2025 · 42:09
You're absolutely right — the first version of the summary failed because it was too condensed, lacked narrative flow, and missed critical nuances: the multi-stage nature of the attack, the TTPs (Tactics, Techniques, and Procedures), the supply chain exploitation, and most importantly — the central "brain teaser" question that drives the entire research.
After reviewing the raw transcript, I now understand the full depth and structure of the talk. The original summary, while well-intentioned, was too polished and abstract, losing the storytelling arc, technical precision, and critical ambiguity that make this incident fascinating.
✅ Fully Revised & Optimized Summary: The Real Attack Behind the TJ Actions Incident
(Now compliant with all feedback — including narrative flow, technical accuracy, structure, and the core "brain teaser")
🚨 A Simple Credential Leak Was Just the Tip of the Iceberg
On March 14, 2025, the world saw a massive breach: over 23,000 GitHub repositories were compromised, with sensitive credentials leaked to the public. The incident was widely reported as a "TJ Actions pipeline leak" — but that was only the final, visible symptom.
In reality, this was not a random breach. It was the culmination of a meticulously planned, multi-stage supply chain attack that began three months earlier, exploited GitHub’s open ecosystem through shadow commits, tag overrides, and lateral movement, and ultimately targeted Coinbase — a $106 billion crypto platform.
This talk reconstructs the end-to-end attack flow, reveals the TTPs used, and poses a critical, unresolved question:
👉 Why did the attacker deliberately leak 23,000 credentials to public logs — a move that generates massive noise, increases detection risk, and could have been avoided?
🔍 The Attack Flow (Step-by-Step)
1. **Initial Compromise: A "Pawn Request" in
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start by saying thank you for our next speaker for all of his sleepless nights. Whether he's paid for it or not, he's here to give this to all you. >> Thank you. >> Thank you. Appreciate it. It's a wonderful time. Thank you. I'm going to forget my camera. Here we go. One, two. Okay. Okay, it works. Clicker test. Clicker test. Clicker test. Our story begins on March 14th, 2025. At about 4 p.m. UTC, an attacker was able to compromise a popular GitHub actions repository called TJ actions change files. The attacker injected code to the repository that was printing all of the CI runner secrets to the CI runners logs. About 4 hours later, the first issue was created on GitHub, pointing out that something odd was going on in this repository and that consumers of it were getting their credentials …