services / Azure / Virtual network

An Azure virtual network (VNet) is the fundamental L3 network-isolation boundary in Azure, defining the address space, subnets, peerings, and security policy scope for all resources deployed into it.

The VNet is the primary network-segmentation boundary in Azure; control-plane privileges on it — altering peerings, address space, or security-group associations, or attaching unauthorized resources into it — can enable significant privilege escalation via lateral network access (per the CRITICAL definition in services/README.md).

Microsoft.​Network/​virtualNetworks/​write

Creating or updating a VNet lets an attacker alter its address space, subnet layout, DNS servers, or peering/security associations, enabling traffic redirection or weakened segmentation across every resource in the VNet.

Risks

1. Data manipulation (HIGH)
2. Network movement (BOOST)

Scope: CRITICAL

This privilege may grant access to sensitive data from a significant fraction of organizational functions, allow interruption of critical organizational services, or its exploit could lead to significant privilege escalation.

Links