Practical write-ups, vulnerability advisories, and deep-dive security research.
Below you will find pages that utilize the taxonomy term “Amazon Cognito”.
This post gives a deep dive into a critical security flaw that was present in Flickr’s login flow. The authentication at identity.flickr.com is implemented using AWS Cognito. By exploiting configuration issues and violations of the OpenID Connect specification, it was possible to takeover any Flickr account without user interaction.
This is the final post of a series on Single Sign-On and OpenID Connect 1.0 security. In this post, Responsible Disclosure processes with five vendors and maintainers of popular OpenID Connect implementations are outlined. We reported vulnerabilities and security issues in Amazon Cognito, Bitbucket Server, GitLab, Keycloak, and Salesforce.
This is the fourth post of a series on Single Sign-On and OpenID Connect 1.0 security. In this post, SSRF vulnerabilities that were discovered in popular OIDC implementations (Keycloak (CVE-2020-10770) and Amazon Cognito) are explained in detail.