Webhook-url-http-3a-2f-2f169.254.169.254-2fmetadata-2fidentity-2foauth2-2ftoken [upd]

Understanding the 169.254.169.254/metadata/identity/oauth2/token Webhook Endpoint: A Security Guide

Stay safe, and always validate your webhooks.

That ugly string in your logs— webhook-url-http-3A-2F-2F169.254.169.254 —is not a configuration error. It is a .

| Permission Level | Potential Actions | |-----------------|-------------------| | Reader on a single storage account | Read all blobs, files, tables – data exfiltration | | Contributor on a resource group | Deploy malicious VMs, modify configurations, delete resources | | Key Vault User | Read secrets, certificates, encryption keys | | Virtual Machine Contributor | Start/stop VMs, create snapshots, install extensions | | Global Administrator (rare, but possible if identity is assigned to privileged roles) | Full takeover of Azure AD tenant |

) to block the web application's user ID from making any requests to the link-local address 169.254.169.254 Resecurity Python script example Understanding the 169

Azure IMDS requires a specific header: Metadata: true . Most SSRF attacks fail if your server doesn't automatically include this.

The attacker is counting on a common developer mistake:

A valid request might look like:

In the world of cloud computing, particularly within Azure environments, security is paramount. A crucial, yet often misunderstood, component of cloud security is the Instance Metadata Service (IMDS). Developers and DevOps engineers frequently encounter scenarios requiring secure authentication between virtual machines (VMs) and cloud services. This article dives deep into the specific endpoint URL: http://169.254.169 . A crucial, yet often misunderstood, component of cloud

Since SSRF originates from within the server, it can reach endpoints protected by perimeter firewalls. This effectively turns the ... Resecurity Azure SSRF with Workflow Designer Feature

A potentially malicious webhook URL has been detected: http://169.254.169.254/metadata/identity/oauth2/token . This URL appears to be attempting to exploit a vulnerability in the Azure Instance Metadata Service.

With an OAuth2 token scoped to the managed identity, an attacker can:

If an attacker can force your application to make HTTP requests to arbitrary URLs, they can request http://169.254.169... to steal the VM's access token, giving them control over resources authorized for that VM. Protection Measures: yet often misunderstood

If you discover webhook-url-http-3A-2F-2F169.254.169.254-2Fmetadata-2Fidentity-2Foauth2-2Ftoken in your logs, assume a potential compromise.

The IP address 169.254.169.254 is a link-local address. Cloud providers use it to host their Cloud Metadata Services.

of approved domains for webhooks and prohibit direct IP addresses. Network Isolation : Use host-level firewall rules (like