If you are sharing this as a security alert or an educational technical post, here is a suggested structure:
Do not allow users to provide raw URLs for callbacks. If you are sharing this as a security
In the original version (IMDSv1), the request was a simple HTTP GET request (as described above). IMDSv2 adds a mandatory session layer: New Zealand Information Security Manual Breakdown of the
in this context most likely refers to a successful security test or a "favorable" finding in a security audit where the vulnerability was confirmed. New Zealand Information Security Manual Breakdown of the Payload callback-url The presence of http-3A-2F-2F in the keyword indicates
http://169.254.169 is a classic SSRF attack payload designed to exploit the AWS Instance Metadata Service (IMDS) to retrieve temporary, sensitive IAM security credentials. If successful, this attack allows unauthorized access to temporary AWS access keys, secret keys, and session tokens, enabling potential AWS environment compromise. Protection requires enforcing IMDSv2, input sanitization, and restricting egress traffic to the 169.254.169.254 IP address.
The presence of http-3A-2F-2F in the keyword indicates that someone is URL-encoding the colon and slashes to evade naive string matching. Web application firewalls (WAFs) and input filters often block http://169.254.169.254 but may miss variations such as:
Recommended actions:
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