Fetch-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f

The Significance of Fetching Metadata from 169.254.169.254: A Deep Dive

IMDSv2

This is the most effective defense. Unlike the original service (IMDSv1), requires a "Session Token." An attacker cannot simply "fetch" the URL; they must first perform a PUT request to create a token, which most SSRF vulnerabilities cannot do. Action: Force "IMDSv2 Required" on all EC2 instances. 2. Follow the Principle of Least Privilege

/latest

: This specifies the version of the metadata service to use. As of my last update, /latest is the correct version to use. The Significance of Fetching Metadata from 169

The URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ is an AWS internal endpoint for the Instance Metadata Service (IMDS), which provides temporary IAM security credentials for applications on EC2 instances. While utilized for legitimate access, this endpoint is a primary target in Server-Side Request Forgery (SSRF) attacks, often mitigated by upgrading from IMDSv1 to the secure, token-based IMDSv2. For more details, visit AWS Blog . The URL http://169