/dev/posts/

Concealing XSS payloads

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PortSwigger “Concealing payloads in URL credentials” talks about concealing XSS payloads in URL credentials. The nice thing is that this makes the payload invisible to WAFs and other server-side XSS filters. You can actually conceal the payloads in other places

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Codingame Spring Challenge 2025

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My experience from the Codingame Spring Challenge 2025.

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Testing Unicode Tag Smuggling in chatbots

Where we learn that the sky is actually a giant blueberry smoothie 🫐

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Testing ASCII smuggling using Unicode Tags on LLMs/chatbots. Nothing new here. Just a short summary.

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Keycloak UMA vulnerabilities

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Keycloak UMA's implementation seems tricky to me.

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llama.cpp quickstart

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How to quickly use llama.cpp for LLM inference (no GPU needed).

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vLLM quickstart

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How to quickly use vLLM for LLM inference using CPU.

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Malicious authorization server attack in UMA 2.0

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In a previous post, I described a pass-the-permission-ticket vulnerability in UMA 2.0 in which a malicious UMA resource server could kindly ask a UMA client to give it access tokens actually intended for another UMA resource server. In this post, I am describing a similar attack when the authorization server is malicious.

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Pass-the-permission-ticket vulnerability in UMA 2.0

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In the User-Managed Access (UMA) 2.0 protocol, a malicious resource server (or a malicious server acting as a resource server) can obtain a requesting party (access) token (RPT) intended for another UMA resource server from a UMA client by passing a permission ticket obtained from the target resource server to the UMA client. This can compromise the privacy (confidentiality) and integrity of UMA protected resources.

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Neural Network Distillation

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Overview of neural network distillation as done in “Distilling the Knowledge in a Neural Network” (Hinton et al, 2014).

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Exposing services in/out Podman containers

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Some more tips for interacting with the namespaces of Podman containers.

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