Cloud Metadata Disclosure

Description

The Cloud Metadata Attack exploits misconfigured NGINX servers to access instance metadata provided by cloud service providers like AWS, GCP, and Azure. These providers expose metadata through the internal, unroutable IP address ‘169.254.169.254’. If NGINX servers are incorrectly configured, this metadata can be accessed by including the IP address in the Host header field.

Recommendation

Ensure that NGINX configurations do not rely on user-controlled data, specifically the Host header variable, which can be manipulated by attackers.

Written by

Anandhu Krishnan

Lead Engineer

Anandhu is an accomplished Senior Lead Engineer with a strong focus on back-end development. His expertise lies in architecting and optimizing the core of software applications to ensure they run smoothly and efficiently. With a meticulous attention to detail and a deep understanding of data management and server-side operations, Anandhu has been a driving force behind the success of various back-end projects.