Set --http-put-response-hop-limit 1 so that containers or proxies cannot forward metadata requests.
Understanding the AWS IMDSv2 Token Request: Decoupling the URL-Encoded cURL Command curl-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fapi-2Ftoken
| Location | Risk Level | Why | |----------|------------|-----| | Public GitHub | Critical | Automated scanners search for 169.254.169.254 | | CI build logs | High | Logs often persist in S3 or Elasticsearch | | Shell history ( .bash_history ) inside containers | High | If container image is leaked | | Web application error logs | Medium | If an SSRF attempt logs the request URL | | Marketing/SEO keyword lists (ironically) | Low | Not directly executable, but indicates awareness | This ensures that the token package cannot traverse
Attackers frequently exploit misconfigured reverse proxies (like Nginx or Apache) or Web Application Firewalls (WAFs) to access internal endpoints. IMDSv2 sets the by default for the token response. This ensures that the token package cannot traverse a network hop through a proxy; it must terminate directly on the EC2 instance container or OS that requested it. 3. Header-Based Filtering This link-local address is the gateway to the
If you are looking for the functional terminal command that this string represents, it decodes to:
If you are working with AWS EC2 instances, you have likely encountered the special IP address 169.254.169.254 . This link-local address is the gateway to the , allowing running instances to securely retrieve information about themselves without needing explicit credentials.
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