CVE-2024-27783: Fortinet FortiAIOps CSRF Vulnerability

CVE-2024-27783 Overview

CVE-2024-27783 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] affecting Fortinet FortiAIOps 2.0.0. The flaw allows an unauthenticated remote attacker to perform arbitrary actions on behalf of an authenticated user. Exploitation requires tricking a victim into executing malicious GET requests, typically through a crafted link or webpage.

Fortinet published Security Advisory FG-IR-24-070 documenting multiple CSRF weaknesses in the affected version. The vulnerability impacts confidentiality, integrity, and availability when a privileged user is targeted.

Critical Impact

An attacker who successfully tricks an authenticated FortiAIOps administrator into visiting a malicious page can execute arbitrary administrative actions, potentially altering AIOps configurations, monitored network data, and operational telemetry.

Affected Products

• Fortinet FortiAIOps 2.0.0

Discovery Timeline

• 2024-07-09 - CVE-2024-27783 published to NVD
• 2026-01-09 - Last updated in NVD database

Technical Details for CVE-2024-27783

Vulnerability Analysis

The vulnerability stems from missing or insufficient anti-CSRF protections on state-changing endpoints in the FortiAIOps 2.0.0 web management interface. The application accepts authenticated GET requests without validating an unpredictable, per-session token bound to the originating page.

Because the endpoints trust ambient browser credentials such as session cookies, any authenticated request originating from the user's browser is processed as legitimate. The attack requires user interaction, but no prior privileges on the target system.

The vulnerability carries a network-based attack vector with high impact across confidentiality, integrity, and availability. The EPSS score is approximately 1.06% with a percentile near 78, reflecting moderate observed interest.

Root Cause

The root cause is the absence of CSRF mitigations on multiple administrative endpoints. The application does not enforce synchronizer tokens, double-submit cookies, or SameSite cookie restrictions sufficient to block cross-origin invocation. State-changing operations exposed over GET further amplify the issue, since GET requests can be triggered passively via image tags, redirects, or embedded resources.

Attack Vector

An attacker hosts a malicious page or sends a phishing message containing a crafted link. When an authenticated FortiAIOps user loads the content, the browser issues GET requests to the FortiAIOps interface using the active session. The server processes these requests as legitimate administrator actions.

No verified public proof-of-concept code is available for CVE-2024-27783. Refer to the Fortinet Security Advisory FG-IR-24-070 for vendor-supplied technical details.

Detection Methods for CVE-2024-27783

Indicators of Compromise

• Unexpected administrative configuration changes in FortiAIOps logs that correlate with administrator web sessions.
• HTTP Referer headers in FortiAIOps access logs pointing to external, untrusted origins during sensitive operations.
• Administrative GET requests originating immediately after a user visits an external URL or opens a phishing email.

Detection Strategies

• Inspect FortiAIOps web access logs for state-changing GET requests accompanied by cross-origin Referer or Origin headers.
• Correlate browser activity from administrator workstations with sensitive FortiAIOps endpoint invocations to identify forged requests.
• Apply web application firewall rules that flag administrative endpoints invoked without a valid CSRF token or with mismatched Origin headers.

Monitoring Recommendations

• Forward FortiAIOps audit and web logs to a centralized SIEM and alert on configuration changes made outside of approved change windows.
• Monitor administrator endpoints for outbound connections to newly registered or low-reputation domains preceding FortiAIOps activity.
• Track session anomalies such as concurrent sessions from different geolocations or user agents tied to the same administrator account.

How to Mitigate CVE-2024-27783

Immediate Actions Required

• Upgrade FortiAIOps 2.0.0 to a fixed release as specified in Fortinet Security Advisory FG-IR-24-070.
• Restrict access to the FortiAIOps management interface to dedicated administrative networks or jump hosts.
• Require administrators to use isolated browsers or dedicated workstations for FortiAIOps management, with no general web browsing.

Patch Information

Fortinet has published remediation guidance in advisory FG-IR-24-070. Administrators should follow the vendor advisory for the specific fixed version and upgrade path applicable to their deployment. Review the Fortinet PSIRT advisory for full details before applying changes.

Workarounds

• Terminate FortiAIOps administrative sessions immediately after use to reduce the window in which CSRF can succeed.
• Enforce strict browser policies that block third-party cookies and apply SameSite=Strict behavior where supported.
• Deploy a reverse proxy or WAF in front of FortiAIOps that validates the Origin and Referer headers on state-changing requests.

# Example NGINX reverse proxy snippet to reject cross-origin requests to FortiAIOps admin paths
location /admin/ {
    if ($http_origin !~* ^https://fortiaiops\.internal\.example\.com$) {
        return 403;
    }
    proxy_pass https://fortiaiops-backend;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
}