services / Azure / Route table

A route table holds user-defined routes that override Azure's default system routes for the subnets it is associated with, controlling the next hop that traffic destined for given address prefixes takes.

A route table is a perimeter/segmentation control; it determines the path (and therefore the exposure) of a subnet's traffic. Rated consistent with the other network-segmentation resources documented alongside it, rather than CRITICAL, which is reserved for tenant-wide IAM/policy objects.

Microsoft.​Network/​routeTables/​write

Creating or updating routes lets an attacker redirect a subnet's traffic to an attacker-controlled next hop, enabling interception/exfiltration of in-transit data, bypass of an intended firewall/NVA hop (destroying the routing control), or wholesale traffic blackholing.

Risks

1. Data exfiltration (CRITICAL)
2. Network destruction (HIGH)
3. 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.

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