CVE-2025-0246
📋 TL;DR
This vulnerability allows an attacker to spoof the address bar in Firefox on Android by using an invalid protocol scheme. Only Android users running Firefox versions below 134 are affected, while other operating systems remain unaffected.
💻 Affected Systems
- Mozilla Firefox
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
An attacker could create a convincing phishing page that appears to be a legitimate website, potentially leading to credential theft or malware installation.
Likely Case
Users might be tricked into entering sensitive information on spoofed websites, resulting in account compromise or data theft.
If Mitigated
With proper user awareness training and updated browsers, the risk is limited to visual deception without direct code execution.
🎯 Exploit Status
Exploitation requires user interaction (visiting a malicious link) but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 134
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2025-01/
Restart Required: Yes
Instructions:
1. Open Google Play Store on Android device. 2. Search for 'Firefox'. 3. If update is available, tap 'Update'. 4. Restart Firefox after update completes.
🔧 Temporary Workarounds
Disable JavaScript
androidPrevents execution of malicious scripts that might exploit this vulnerability
about:config → javascript.enabled → false
Use Desktop Mode
androidSwitch to desktop view mode which may have different address bar rendering
Tap menu → 'Desktop site'
🧯 If You Can't Patch
- Use alternative browsers on Android devices
- Implement network filtering to block suspicious domains
🔍 How to Verify
Check if Vulnerable:
Open Firefox → Menu → Settings → About Firefox → Check version numberCheck Version:
about:Verify Fix Applied:
Confirm version is 134 or higher in About Firefox📡 Detection & Monitoring
Log Indicators:
- Unusual protocol scheme usage in browser logs
- Multiple failed authentication attempts from same IP
Network Indicators:
- HTTP requests with unusual protocol schemes
- Traffic to known phishing domains
SIEM Query:
source="firefox_logs" AND (protocol="invalid_scheme" OR url_contains("://invalid"))