Horizon Alert
Summary of the vulnerability and why it matters
Fortinet products, including FortiOS, FortiProxy, and FortiSwitchManager, are affected by a vulnerability related to the verification of cryptographic signatures. This flaw permits an unauthenticated attacker to circumvent the FortiCloud Single Sign-On (SSO) login process. Such a bypass could lead to unauthorized access to systems and data, potentially impacting organizational security and operational integrity.
- Vulnerable Fortinet products
- Flaw bypasses SSO authentication
- Unauthorized access to systems
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can bypass FortiCloud SSO login authentication by sending a specially crafted SAML response. This allows the attacker to gain unauthorized access to the system. The vulnerability exists in the verification of cryptographic signatures within the SAML authentication process.
- Exposure condition: SAML SSO authentication is exposed.
- Attacker starting point: Network access.
- Trigger and result: Crafted SAML response bypasses authentication.
Live Threat
Current exploitation, exposure, and threat context
A critical vulnerability exists within several Fortinet products, including FortiOS, FortiProxy, and FortiSwitchManager. This flaw allows an attacker to bypass authentication for FortiCloud Single Sign-On (SSO) by sending a specially crafted SAML response. Successful exploitation could lead to unauthorized access to systems and sensitive data, posing a significant business risk. The vulnerability has been identified as actively exploited, increasing the urgency for remediation.
- Attackers require low skill.
- No access or conditions needed.
- Business risk is high, treat as urgent.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability permits an unauthenticated attacker to bypass FortiCloud SSO authentication by submitting a specially crafted SAML response. The impact can include unauthorized access to systems and data. Organizations should take immediate steps to identify and protect against this risk.
- Identify all affected Fortinet assets.
- Reduce exposure or isolate risk.
- Apply vendor fixes, verify, and monitor.
