DNS | Code Before Breach

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How to Block ECH and Mitigate DoH in Enterprise Networks

A hands-on guide using dnsmasq to filter SVCB and HTTPS records for disabling ECH and enforcing central DNS policies. Notes that DoH requires separate network-layer policies.

Review of Citrix Security Policy Effectiveness

Citrix administrators apply security policies to each user’s VDI (Virtual Desktop Infrastructure) through Citrix Group Policy. However, certain structural vulnerabilities in Citrix CSE (Citrix Service Engine) and the Citrix VDI Agent allow for potential bypassing of these security policies.

Security threats and mitigation strategies for java reflection

The **Java Reflection API** is a powerful tool that allows dynamic manipulation of classes, methods, and interfaces at runtime. However, due to its flexibility, it introduces significant security risks, as attackers can exploit it to gain unauthorized access to systems. In this article, we will explore the security threats posed by Java Reflection and outline strategies to mitigate these risks.

How to Block ECH and Mitigate DoH in Enterprise Networks

Background Public DNS services like Cloudflare (1.1.1.1) and Google (8.8.8.8) have increasingly been abused as C2 channels for malware. Technologies such as DoH (DNS over HTTPS) and ECH (Encrypted Client Hello) encrypt DNS traffic and SNI fields, making it difficult for security solutions to detect and inspect network activity. Note: ESNI (Encrypted SNI) is deprecated and has been replaced by ECH as the current standard. This guide focuses on ECH only. ...