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.
Compass Security Blog
Offensive Defense
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.
Passwordless products promise greater security and convenience by allowing users to log in to Windows systems with only their smartphone. But what is going on behind the scenes and how could a domain’s security stance be worsened by such a solution? In this post I will explain how these products are implemented and detail the vulnerabilities and weaknesses discovered in three tested products.
A post on how to trick browsers to work as a gateway to internal web servers and IoT devices, the concepts behind and how to easily exploit DNS rebinding using the Singularity of Origin framework.
Fighting cybercrime is one of the reason Switch announced to publish the .ch zone. Switzerland has a law on Open-Government-Data-Strategy that follows the open-by-default strategy The .ch zone file contains all registered .ch domain names that have a NS record that points to the nameserver that gives authoritative answers for that domain name. Compass Security is offering […]
Since a few years, we – as pentesters – (and probably bad guys as well) make use of NTLM relaying a lot for privilege escalation in Windows networks.
In this article, we propose adding support for the RPC protocol to the already great ntlmrelayx from impacket and explore the new ways of compromise that it offers.
This vulnerability was discovered by Compass Security in January 2020, disclosed to Microsoft Security Response Center and assigned CVE-2020-1113 as identifier.
As a defender, you want to find and patch attack paths in your Active Directory environment. One cannot easily spot issues by looking at the Active Directory Users and Computers console, GPOs, etc. but here comes BLOODHOUND.
Security in Wi-Fi networks has been, at some point non-existent, then questioned, improved and questioned again over the last two decades. This post provides an overview over the latest developments in Wi-Fi and outlines attacks and defenses.
Perfect Forward Secrecy (PFS) is a concept in Transport Layer Security (TLS) that makes sure that even if attackers manage to gain access to the private key of a certificate, they are not able to decrypt communication from the past (or communication in the future, without using active man in the middle attacks). Or in other […]
The “Internet of Things” (IoT) grows quickly. More and more devices are connected to the Internet to automate tasks and simply life. Fridges automatically order milk, cars are taught to self-drive via a simple update and bridges send live updates about their structural integrity. According to Gartner’s 2016 Tech Trends, IoT will define the shape of tomorrow’s […]
© 2024 Compass Security Blog