services / Azure / Bastion Host

Azure Bastion is a managed PaaS jump host deployed in a VNet that brokers secure browser-based RDP/SSH connectivity to VMs without exposing public IPs on those VMs.

A production secure-access entry point into a private network; controlling or observing it affects reachability of all VMs behind it.

Microsoft.​Network/​BastionHosts/​write

Reconfiguring an existing Bastion (e.g. enabling IP-based connection, native client support, or weakening its associated network restrictions) can broaden how it may be reached (network escalation); standing up a new Bastion Host gives an attacker a durable, sanctioned-looking remote-access foothold into the VNet (persistence).

Risks

1. Account persistence (BOOST)
2. Network movement (BOOST)

Scope: HIGH

This privilege may grant access to sensitive data from a single organizational function, or allow interruption of a service supporting a single organizational function.

Links