CVE-2024-7530
📋 TL;DR
CVE-2024-7530 is a use-after-free vulnerability in Firefox caused by incorrect garbage collection interaction. Attackers could exploit this to execute arbitrary code or cause crashes. All Firefox users on versions below 129 are affected.
💻 Affected Systems
- Mozilla Firefox
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, or malware installation.
Likely Case
Browser crash (denial of service) or limited memory corruption leading to information disclosure.
If Mitigated
Minimal impact if browser sandboxing and exploit mitigations prevent successful exploitation.
🎯 Exploit Status
Exploitation requires JavaScript execution but no authentication. Complexity is medium due to garbage collection timing requirements.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 129
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-33/
Restart Required: Yes
Instructions:
1. Open Firefox. 2. Click menu → Help → About Firefox. 3. Firefox will check for updates and install Firefox 129. 4. Restart Firefox when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allTemporarily disable JavaScript to prevent exploitation via malicious websites
about:config → javascript.enabled = false
Use Enhanced Tracking Protection Strict mode
allBlocks more scripts and trackers that could be used in exploitation
Settings → Privacy & Security → Enhanced Tracking Protection → Strict
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only
- Implement application whitelisting to prevent unauthorized Firefox execution
🔍 How to Verify
Check if Vulnerable:
Check Firefox version: if version is less than 129, system is vulnerable.Check Version:
firefox --version (Linux/macOS) or navigate to about:support (all platforms)Verify Fix Applied:
Confirm Firefox version is 129 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Firefox crash reports with memory corruption signatures
- Unexpected process termination events
Network Indicators:
- Unusual outbound connections from Firefox process after visiting suspicious sites
SIEM Query:
process_name:"firefox.exe" AND (event_id:1000 OR event_id:1001) AND description:"ACCESS_VIOLATION"