Compass Security Blog

Offensive Defense

Microsoft BitLocker Bypasses are Practical

In this blog article, we would like to share key insights from the “Defeating Microsoft’s Default BitLocker Implementation” security training by Hands-On Security and emphasize the potential risks and consequences associated with this attack technique. Our target audience includes businesses looking to safeguard sensitive data on their Windows devices, as well as individuals with an elevated requirement for protecting their data.

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Device Code Phishing – Add Your Own Sign-In Methods on Entra ID

TL;DR An attacker is able to register new security keys (FIDO) or other authentication methods (TOTP, Email, Phone etc.) after a successful device code phishing attack. This allows an attacker to backdoor the account (FIDO) or perform the self-service password reset for the account with the newly registered sign-in methods. Microsoft deemed this not a vulnerability.

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Microsoft Teams Covert Channels Research

With the rise of remote working, Microsoft Teams has become the de-facto standard for video conferences, chat, and collaboration. The nature of the Teams architecture are some central systems that route information between parties. With that comes that Teams client software must be allowed to communicate to the Internet. Microsoft even recommends letting Teams traffic bypass inspection proxies for compatibility reasons. Its network communication pattern has significant overlap with malicious C2 traffic und thus it is nearly impossible for blue teams to spot adversary communication. Therefore, Teams is an interesting candidate to be abuses for C2 traffic. Thus, we put some research into this.

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Exposing the Scammers: Unmasking the Elaborate Job Offering Scam

In the era of the internet, scams vary in forms, targeting those who aren’t cautious. Lately, a fresh scam focused on Switzerland has gained attention on social media and in the news. This scam revolves around job offers from a seemingly genuine headhunting company. I chose to engage with the scammers to uncover the secrets of this scheme.

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Device Code Phishing – Compass Tooling

Device code phishing is nothing new. In fact it has been around for some years now. Despite the awesome capabilities of device code phishing, it is not widely used by threat actors. Therefore, it probably does not receive much attention from Microsoft. Compass Security is releasing two tools that can work hand in hand in a device code phishing exercise or even your next red team engagement.

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Relaying NTLM to MSSQL

Readers of this blog probably know that I like to try NTLM relaying over all protocols possible! Relaying to Microsoft SQL (MSSQL) is known to work when using the default weak configuration.

With this blog post, we show some dangerous configurations and release a small tool to automate NTLM relaying in these cases.

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From MQTT Fundamentals to CVE

Internet of Things (IoT) and Operational Technology (OT) is an area that has grown strongly in recent years and is increasingly being used in the business world. To be able to test the security in this area, let’s take a closer look at the Message Queuing Telemetry Transport (MQTT) protocol to understand the strengths and weaknesses of the protocol.

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A sneaky attack to your platform 

Nowadays, web developers rely mostly on well-established frameworks to develop their platform or web sites. These frameworks take care of many vulnerabilities like XSS, SQLi, etc. and give the developers a care-free environment.

However, there is one sneaky weakness that can escape the usual checks quite easily and go undetected: SSRF.

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Lenovo Update Your Privileges

A journey into the discovery of privilege escalation vulnerabilities in the Lenovo Update process.

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Securing Connections to your Remote Desktop

When accessing a remote server, one should always assume it has been compromised or might be in the near future. It is particularly crucial for users with administrative privileges to establish a secure connection to the Remote Desktop Protocol (RDP) service in order to not fall victim to credential theft or impersonation. To achieve this, there exist several measures in Windows. In this blog post, we’ll look at some of them, their benefits and their drawbacks.

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