services / Azure / VPN link connection shared key

The IPsec pre-shared key (PSK) for a VPN link connection within a site-to-site VPN gateway connection. This secret authenticates the IPsec tunnel between the Azure VPN gateway and the peer (on-prem/remote) endpoint.

The shared key is a tunnel-authenticating credential; exposure or control of it directly impacts connectivity to and the security of the bridged network.

Microsoft.​Network/​vpnGateways/​vpnConnections/​vpnLinkConnections/​sharedKeys/​default/​read

Despite the /read verb, this returns the VPN tunnel's IPsec pre-shared key (credential material), enabling crypto exfiltration; with the PSK an attacker can impersonate the peer and stand up a tunnel to reach the connected network.

Risks

1. Cryptographic exfiltration (CRITICAL)
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.

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