Horizon Alert
Summary of the vulnerability and why it matters
A critical vulnerability exists in Fortinet FortiMail, potentially allowing unauthenticated attackers to access any recipient's encrypted email sessions, read mail, or send messages on their behalf. This issue lies within the Identity Based Encryption webmail component and could expose sensitive communications.
- Attackers can impersonate email recipients.
- Protects confidential email communication.
- Verify if FortiMail is in use.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker could exploit this vulnerability by sending specially crafted HTTP requests to the Identity Based Encryption (IBE) webmail feature. This would allow them to gain an authenticated session as any IBE recipient, enabling them to read or send encrypted mail.
- No authentication required.
- Crafted HTTP requests to webmail.
- Read or send any encrypted mail.
Live Threat
Current exploitation, exposure, and threat context
An unauthenticated attacker could gain access to encrypted emails and send messages as any recipient, potentially exposing sensitive communications. This could occur when the Identity Based Encryption (IBE) webmail feature is accessible and the crafted HTTP requests are sent.
- Encrypted email content and recipient sessions.
- Crafted HTTP requests to IBE webmail.
- Unauthorized access to sensitive communications.
Operational Fix
Recommended remediation, mitigation, and detection steps
Teams responsible for FortiMail, including infrastructure and security operations, should prioritize identifying all instances of the affected product within their environment. Confirming the reachability and business criticality of these instances will inform risk-based remediation planning and vendor coordination.
- Own the issue: Infrastructure and Security Operations teams.
- Verify first: Confirm reachable and business-critical instances.
- Action: Plan remediation based on identified risk.
