Azure Image Builder Series - Introduction

in Azure by Ingo Deißenroth
1.4k words · 8 min to read

Azure Image Builder is a virtual machine image provisioning service on Microsoft Azure based on HashiCorp Packer. It has been designed to integrate natively with Microsoft Azure to allow customers to easily create and maintain virtual machine images for consistent deployments. This post is the first of a series to introduce the Azure Image Builder and its benefits by means of showing real-world examples.

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The Secret Management Solution HashiCorp Vault allows the Integration of a variety of Identity Providers. Although currently no direct Implementation for Human Users of Azure AD exists, the JWT/OIDC Auth Method provides a way to enable authentication and authorization for Azure AD Users to HashiCorp Vault. This post shows how to configure HashiCorp Vault to enable User Login with Azure AD Credentials as well as assigning Permissions/Policies based on their Group Memberships.

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The Alert policies in O365 are an often overlooked or underestimated security feature for indicators of compromise (IOC). They enable especially administrators for smaller tenants to supervise their environments on a critical level in terms of security events. As part of a multilevel defense the O365 Alerts add a lot value, as they are easy to setup and part of every O365 and therefore free of additional costs.

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Azure Hybrid DNS Architecture

in Azure by Christoph Burmeister
2.8k words · 17 min to read

Azure private DNS is a great solution to simplify DNS resolution for cloud resources in Azure. However, chances are you have components in your infrastructure that do not natively integrate with Azure DNS zones. In this post, I will show you how you to enable your own DNS solution to resolve names from Azure private DNS zones with CoreDNS on Azure Kubernetes Service.

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In this part of the series I want to talk about the most obvious and meaningful security measure for O365 – Multifactor authentication (MFA). The well-established technology can significantly reduce the attack surface of your organization and is easy to implement for O365 administrators. It should be your first line of defense against phishing and replay attacks in your security environment. In this article I want to talk about the technical/mathematical concept of the standard and show you how to activate the tool and its features in your tenant.

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This part is focused once again on mail traffic and its attack vectors. Specifically, I wanted to tag all incoming mails in Office 365 Exchange, which are not coming from trusted domains. This is really easy to implement with Exchange Online rules and doesn’t even require any kind of powershell knowlegde, so every O365 should have implemented this policy in their environment.

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How you do implement basic security policies for your company’s Office 365 system? As mail systems are usually the main target for your average cyber criminals, a quick strategy was needed to harden the first line of defense against this attack vector. The measures I came up with are luckily not any kind of rocket science and easy to implement even by not so experienced O365 admins, as they are well established and around for quite a while by now. But they are a great way to harden your network and protect your users against cyber criminals with just a few hours of work. This is a three part series, starting with how to implement DMARC for your Office 365 Exchange Server.

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