Details
Alert Id 90034
Alert Type Active Scan Rule
Status beta
Risk High
CWE
WASC

Summary

The Cloud Metadata Attack attempts to abuse a misconfigured NGINX server in order to access the instance metadata maintained by cloud service providers such as AWS, GCP and Azure. All of these providers provide metadata via an internal unroutable IP address ‘169.254.169.254’ - this can be exposed by incorrectly configured NGINX servers and accessed by using this IP address in the Host header field.

Solution

Do not trust any user data in NGINX configs. In this case it is probably the use of the $host variable which is set from the 'Host' header and can be controlled by an attacker.

References

Code

org/zaproxy/zap/extension/ascanrulesBeta/CloudMetadataScanRule.java