CVE-2019-25367: ArangoDB Aardvark Interface XSS Vulnerability

CVE-2019-25367 Overview

ArangoDB Community Edition version 3.4.2-1 contains multiple cross-site scripting (XSS) vulnerabilities in the Aardvark web admin interface. The vulnerabilities exist in index.html and can be exploited through search, user management, and API parameters. Attackers can inject malicious scripts via parameters in /_db/_system/_admin/aardvark/index.html to execute arbitrary JavaScript code in authenticated users' browsers.

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in the context of authenticated administrator sessions, potentially leading to session hijacking, credential theft, or unauthorized database operations.

Affected Products

• ArangoDB Community Edition 3.4.2-1

Discovery Timeline

• 2026-02-15 - CVE CVE-2019-25367 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2019-25367

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Cross-Site Scripting), a web application vulnerability that occurs when user input is improperly sanitized before being rendered in the browser. The Aardvark web admin interface in ArangoDB fails to properly validate and encode user-supplied input across multiple parameters, allowing attackers to inject malicious script content that executes within the security context of authenticated users.

The attack requires network access and user interaction, as a victim must be lured into clicking a malicious link or visiting a compromised page while authenticated to the ArangoDB admin interface. The vulnerability has a contained scope affecting confidentiality and integrity of the downstream component (browser session) rather than the vulnerable system itself.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the Aardvark web admin interface. The application fails to sanitize user-controlled parameters in index.html before rendering them in the HTML response. Specifically, the search functionality, user management features, and API parameters do not properly escape special characters that have meaning in HTML/JavaScript contexts, allowing the injection of executable script content.

Attack Vector

The attack is conducted over the network and requires the attacker to craft a malicious URL containing JavaScript payload in vulnerable parameters. The attacker must then trick an authenticated ArangoDB administrator into clicking the malicious link or visiting a page that automatically submits the crafted request. When the victim's browser processes the response, the injected script executes with the privileges of the authenticated session.

The vulnerability can be exploited through multiple entry points within the Aardvark interface, including search queries, user management operations, and API parameter handling. Each of these vectors reflects user input back to the browser without adequate sanitization.

Detection Methods for CVE-2019-25367

Indicators of Compromise

• Unusual JavaScript payloads in web server access logs containing /_db/_system/_admin/aardvark/index.html with encoded script tags or event handlers
• Browser console errors indicating blocked inline scripts if Content Security Policy is partially implemented
• Unexpected outbound network connections from administrator workstations following ArangoDB admin interface access
• Session tokens or credentials appearing in referrer headers to external domains

Detection Strategies

• Monitor web application firewall (WAF) logs for XSS patterns targeting the Aardvark admin interface paths
• Implement browser-based XSS detection rules to identify script injection attempts in URL parameters
• Review ArangoDB access logs for requests containing suspicious characters such as <script>, onerror=, onload=, or javascript: URI schemes
• Deploy network intrusion detection signatures for reflected XSS payloads targeting database administration interfaces

Monitoring Recommendations

• Enable verbose logging for the ArangoDB web interface to capture full request parameters
• Configure SIEM alerts for repeated XSS-pattern requests to the /aardvark/ endpoint
• Monitor for unusual session activity following administrator access to ArangoDB, including bulk data exports or privilege changes
• Implement Content Security Policy headers and monitor violation reports for early detection of exploitation attempts

How to Mitigate CVE-2019-25367

Immediate Actions Required

• Upgrade ArangoDB Community Edition to a version that addresses these XSS vulnerabilities
• Restrict network access to the Aardvark admin interface to trusted IP ranges only
• Implement a Web Application Firewall (WAF) with XSS detection rules in front of the ArangoDB admin interface
• Educate administrators to avoid clicking links to the admin interface from untrusted sources

Patch Information

Organizations should review the ArangoDB Official Website for security updates and upgrade to a patched version. Additional technical details are available in the VulnCheck ArangoDB Advisory and Exploit-DB #46407.

Workarounds

• Disable or restrict access to the Aardvark web admin interface if not required for operations
• Use network segmentation to limit admin interface exposure to management networks only
• Implement strict Content Security Policy (CSP) headers via a reverse proxy to prevent inline script execution
• Require VPN access for administrative interface connectivity

# Configuration example - Restrict Aardvark admin interface access via iptables
# Allow access only from trusted management subnet
iptables -A INPUT -p tcp --dport 8529 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8529 -j DROP

# Alternative: Disable web interface in ArangoDB configuration
# Edit arangod.conf
# [server]
# disable-authentication = false
# endpoint = tcp://127.0.0.1:8529