CVE-2024-10941
📋 TL;DR
This vulnerability allows malicious websites to crash Firefox browsers by including iframes with malformed URIs. It affects Firefox versions before 126. The crash is non-exploitable, meaning it causes denial of service but not code execution.
💻 Affected Systems
- Mozilla Firefox
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Browser crashes repeatedly when visiting malicious sites, causing denial of service and potential data loss from unsaved work.
Likely Case
Users experience browser crashes when visiting specially crafted malicious websites, requiring browser restart.
If Mitigated
With updated browser, no impact. With workarounds, reduced exposure to malicious sites.
🎯 Exploit Status
Exploitation requires user to visit malicious website but no authentication or special privileges needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 126 and later
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-21/
Restart Required: Yes
Instructions:
1. Open Firefox. 2. Click menu > Help > About Firefox. 3. Firefox will check for updates and install Firefox 126+. 4. Restart Firefox when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious scripts that could trigger the vulnerability
about:config > javascript.enabled = false
Use NoScript extension
allBlocks scripts from untrusted websites
Install NoScript extension from Firefox Add-ons
🧯 If You Can't Patch
- Use alternative browser for accessing untrusted websites
- Implement web filtering to block known malicious sites
🔍 How to Verify
Check if Vulnerable:
Check Firefox version: if version is less than 126, system is vulnerable.Check Version:
firefox --version (Linux/macOS) or Help > About Firefox (Windows)Verify Fix Applied:
Verify Firefox version is 126 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Firefox crash reports in system logs
- Browser process termination events
Network Indicators:
- HTTP requests to suspicious domains with iframe parameters
SIEM Query:
source="firefox.log" AND ("crash" OR "segmentation fault")