CVE-2025-0277
📋 TL;DR
HCL BigFix Mobile 3.3 and earlier have an insecure Content Security Policy (CSP) that doesn't properly restrict script sources. This allows attackers to trick users into performing unintended actions via cross-site scripting (XSS). Organizations using affected versions of HCL BigFix Mobile are vulnerable.
💻 Affected Systems
- HCL BigFix Mobile
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute arbitrary JavaScript in users' browsers, potentially stealing session cookies, performing actions as the user, or redirecting to malicious sites.
Likely Case
Attackers could inject malicious scripts to steal user credentials, session tokens, or perform limited actions within the application context.
If Mitigated
With proper CSP restrictions, script execution would be blocked, preventing XSS attacks even if injection occurs.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link) and knowledge of the application's CSP weaknesses.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.4 or later
Vendor Advisory: https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0124513
Restart Required: No
Instructions:
1. Download HCL BigFix Mobile version 3.4 or later from HCL support portal. 2. Follow HCL's upgrade documentation for your deployment. 3. Verify CSP headers now properly restrict script sources.
🔧 Temporary Workarounds
Implement Custom CSP Headers
allManually configure restrictive Content Security Policy headers to block inline scripts and restrict script sources to trusted domains only.
Set HTTP header: Content-Security-Policy: script-src 'self' https://trusted.cdn.example.com; object-src 'none';
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block XSS payloads.
- Educate users about phishing risks and implement click-through warnings for external links.
🔍 How to Verify
Check if Vulnerable:
Check HTTP response headers for Content-Security-Policy. If script-src includes 'unsafe-inline' or wildcards (*), or if CSP is missing, the system is vulnerable.Check Version:
Check BigFix Mobile admin console or configuration files for version information.Verify Fix Applied:
Verify HTTP response headers include restrictive CSP without 'unsafe-inline' and with specific trusted script sources only.📡 Detection & Monitoring
Log Indicators:
- Unusual user activity patterns
- Multiple failed login attempts from same session
- Unexpected redirects in access logs
Network Indicators:
- HTTP requests with suspicious script tags or JavaScript in parameters
- Traffic to unexpected external domains from BigFix Mobile sessions
SIEM Query:
source="bigfix-mobile" AND (http_uri="*<script*" OR http_uri="*javascript:*" OR http_referer="*malicious-domain*")