ITSEC Newsletter 2025-01-23

In this tutorial, we're going to build a tiny, standalone, online Certificate Authority (CA) that will mint TLS certificates and is secured with a YubiKey. It will be an internal ACME server on our local network (ACME is the same protocol used by Let's Encrypt). The YubiKey will securely store the CA private keys and sign certificates, acting as a cheap alternative to a Hardware Security Module (HSM). We'll also use an open-source True Random Number Generator, called Infinite Noise TRNG, to spice up the Linux entropy pool.

In this blog, we will explain how we used QEMU to emulate the relevant system components of Planet Technology Corp’s WGS-804HPT Industrial switch, and how it was used to uncover three vulnerabilities that could allow an attacker to remotely execute code on a vulnerable device. The vulnerabilities include separate buffer and integer overflow vulnerabilities and an OS command injection flaw; we were able to develop an exploit that leverages these bugs and remotely runs code on the device.

tldr: Azure DevOps can be accessed using multiple 1st party client ids, allowing anyone to pivot from a stolen session to access the repositories.