CVE-2024-0318: FireEye HXTool XSS Vulnerability

CVE-2024-0318 Overview

CVE-2024-0318 is a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in FireEye HXTool version 4.6. The flaw allows an attacker to inject a specially crafted JavaScript payload through the Profile Name and Hostname/IP input parameters. The payload persists in the application and executes in the browser of any user who loads the affected items.

HXTool is an open-source web-based extension used by analysts to interact with FireEye Endpoint Security (HX) controllers. Successful exploitation can lead to session compromise, credential theft, or actions performed under the identity of an authenticated operator.

Critical Impact
Stored JavaScript payloads execute in the security operator's browser session, enabling account impersonation and abuse of HX controller access.

Affected Products

FireEye HXTool version 4.6
Deployments exposing the HXTool web interface to analyst workstations
Environments where profiles or hostnames are shared across HXTool users

Discovery Timeline

2024-01-15 - CVE-2024-0318 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2024-0318

Vulnerability Analysis

The vulnerability is a stored XSS issue in the HXTool web interface. HXTool accepts user input for the Profile Name and Hostname/IP fields without properly encoding or sanitizing the values before storage. When another user later loads a page that renders these stored values, the browser interprets the injected content as executable JavaScript.

Because the payload is stored server-side, exploitation does not require a crafted link for each victim. Any authenticated user who views the affected profile or host entry executes the attacker's script in the context of the HXTool origin.

Root Cause

The root cause is missing output encoding of user-supplied values in HXTool 4.6. The application persists raw input to its data store and reflects it back into HTML responses without HTML-entity encoding or Content Security Policy enforcement. This is a classic instance of CWE-79, Improper Neutralization of Input During Web Page Generation.

Attack Vector

Exploitation requires network access to the HXTool interface and a victim interaction such as loading a profile list or host detail page. An attacker with the ability to create or modify a profile submits a payload in the Profile Name or Hostname/IP field. The injected script executes when a second user, typically an analyst or administrator, loads the stored entry.

Impact scenarios include exfiltration of session cookies, forced API calls to the HX controller, and pivoting to endpoints managed by HX. See the INCIBE CERT Notice on FireEye Vulnerabilities for the coordinated advisory.

Detection Methods for CVE-2024-0318

Indicators of Compromise

Profile or host records in HXTool containing <script>, onerror=, onload=, or javascript: substrings
Outbound HTTP requests from analyst browsers to unrecognized domains immediately after loading HXTool pages
Unexpected HX controller API calls originating from analyst session tokens outside normal working patterns

Detection Strategies

Inspect the HXTool backing database for stored HTML or JavaScript characters in the Profile Name and Hostname/IP fields
Deploy web application firewall rules to alert on script tags or event-handler attributes submitted to HXTool endpoints
Correlate HXTool web server access logs with browser telemetry to detect anomalous script execution after page loads

Monitoring Recommendations

Enable verbose logging on the HXTool web server and forward events to a centralized logging or SIEM platform for review
Monitor HX controller audit logs for API actions initiated shortly after HXTool page renders
Alert on new or modified HXTool profiles created from unexpected source addresses or accounts

How to Mitigate CVE-2024-0318

Immediate Actions Required

Restrict network access to the HXTool interface to a small set of trusted analyst workstations
Audit existing profile and host entries and remove any records containing HTML or JavaScript content
Require multi-factor authentication and unique accounts for every HXTool operator to limit blast radius

Patch Information

No vendor patch is referenced in the NVD entry for HXTool 4.6. Consult the INCIBE CERT Notice on FireEye Vulnerabilities for current remediation guidance and monitor the HXTool project repository for updated releases.

Workarounds

Place HXTool behind a reverse proxy that enforces a strict Content Security Policy blocking inline scripts
Validate and reject input containing angle brackets or event-handler keywords in profile and host fields before submission
Isolate HXTool sessions in a dedicated browser profile that does not share cookies or extensions with production tooling

bash

# Example nginx reverse proxy header hardening for HXTool
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header Referrer-Policy "no-referrer" always;