Zero-Day Advisory

Fortinet Discovers Broken Authentication & Session Management Vulnerability in Google's Bug-Tracking System


Fortinet's FortiGuard Labs has discovered a Broken Authentication & Session Management Vulnerability in Chromium's Monorail-based Bug-Tracking-System [].

The website is a Bug Tracking System for Bugs & Security Vulnerabilities (Zero-Days) related to Google Chrome Browser, Google Project Zero, Google PDF Engine (PDFium), Google Javascript Engine (V8), Chromium OS, etc.

A Broken Authentication & Session Management Vulnerability has been discovered in The vulnerability is caused due to a Non-Implementation of immediate Cross-Origin Logout using token re-validation with the original authentication authority. The victim is logged out after a delay of 5 minutes during which an attacker could easily access confidential Zero-Day vulnerabilities (reported by the victim) by leveraging this vulnerability. The issue has been acknowledged by Google, but categorized as Wont-Fix as it is working as intended/by-design and the fix needed is not scalable or robust.


The vulnerability still exits because Google won't fix it.

Additional Information

The link and video in Reference can provide the step-by-step details for the vulnerability.


This vulnerability was discovered by Kushal Arvind Shah of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.