This article highlights a critical vulnerability in modern security operations: the gap between secure authentication and secure access. While many organizations have implemented robust front-door security measures like FIDO2 and device trust, these controls often fail to protect the integrity of downstream sessions. Once an identity provider hands off a token to a service provider, session cookies become portable and vulnerable to theft by info-stealer malware, allowing attackers to bypass multi-factor authentication entirely.
To address this architectural reality of HTTP and federation standards, defenders must implement continuous session verification. The author recommends several defense-in-depth strategies, including the deployment of token binding, shortening session timeouts, and enforcing IP pinning through VPNs or Security Service Edge (SSE) solutions. Additionally, adopting the Shared Signals Framework and monitoring for session anomalies in SIEM logs are vital steps to ensure that security persists throughout the entire duration of a user's access, rather than just at the moment of login.
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