: A common parameter used by web applications to handle external integrations, webhook processing, or URL redirects.
It looks like you posted an encoded URL: callback-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F : A common parameter used by web applications
: If an application allows a user to provide a URL (like a callback or webhook) and then fetches that URL from the server side without validation, an attacker can input the internal 169.254.169.254 address. Search your application, proxy, and VPC flow logs
: Success allows the attacker to steal the AccessKeyId , SecretAccessKey , and Token of the IAM role attached to that server. Now, let's dissect the callback URL: http://169
Search your application, proxy, and VPC flow logs for any GET requests to 169.254.169.254 . An immediate alert should fire if this is discovered from an unexpected source.
Attackers use this URL to trick a vulnerable server into fetching temporary security credentials that can be used to take control of an entire cloud environment.
Now, let's dissect the callback URL: http://169.254.169.254/latest/meta-data/iam/security-credentials/ .