CVE-2024-9680
📋 TL;DR
This critical vulnerability allows remote attackers to execute arbitrary code by exploiting a use-after-free flaw in Firefox's animation timeline implementation. Attackers can achieve code execution in the content process, potentially compromising user systems. Affected users include those running vulnerable versions of Firefox, Firefox ESR, and Thunderbird.
💻 Affected Systems
- Firefox
- Firefox ESR
- Thunderbird
📦 What is this software?
Firefox by Mozilla
Firefox by Mozilla
Firefox by Mozilla
Thunderbird by Mozilla
Thunderbird by Mozilla
Thunderbird by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the victim's machine, enabling data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Remote code execution leading to malware installation, credential theft, and unauthorized access to sensitive user data and browser sessions.
If Mitigated
Limited impact with proper network segmentation and application sandboxing, though browser compromise could still lead to session hijacking.
🎯 Exploit Status
Actively exploited in the wild. Exploitation requires user to visit malicious website or open malicious email content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 131.0.2, Firefox ESR 128.3.1, Firefox ESR 115.16.1, Thunderbird 131.0.1, Thunderbird 128.3.1, Thunderbird 115.16.0
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-51/
Restart Required: Yes
Instructions:
1. Open Firefox/Thunderbird. 2. Click menu → Help → About Firefox/Thunderbird. 3. Browser will check for updates and prompt to install. 4. Restart browser when update completes. For enterprise deployments, use your standard patch management system.
🔧 Temporary Workarounds
Disable JavaScript
allTemporarily disable JavaScript to prevent exploitation via malicious websites
about:config → javascript.enabled = false
Use Content Security Policy
allImplement strict CSP headers to limit script execution
Content-Security-Policy: script-src 'self'
🧯 If You Can't Patch
- Block access to untrusted websites and disable email HTML rendering
- Implement network segmentation and monitor for unusual browser process behavior
🔍 How to Verify
Check if Vulnerable:
Check browser version in About dialog. If version matches affected range, system is vulnerable.Check Version:
firefox --version or thunderbird --versionVerify Fix Applied:
Verify version is updated to patched version in About dialog. Version should be Firefox ≥131.0.2, Firefox ESR ≥128.3.1 or ≥115.16.1, Thunderbird ≥131.0.1, Thunderbird ≥128.3.1, or Thunderbird ≥115.16.0.📡 Detection & Monitoring
Log Indicators:
- Browser crash reports with animation-related modules
- Unusual process spawns from browser processes
- Memory access violations in browser logs
Network Indicators:
- Connections to known malicious domains from browser processes
- Unusual outbound traffic patterns after visiting websites
SIEM Query:
process_name:firefox.exe AND (event_id:1000 OR event_id:1001) AND description:*animation* OR process_name:firefox.exe AND parent_process_id != explorer.exe🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1923344
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49039
- https://www.mozilla.org/security/advisories/mfsa2024-51/
- https://www.mozilla.org/security/advisories/mfsa2024-52/
- https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281992
- https://lists.debian.org/debian-lts-announce/2024/10/msg00005.html
- https://lists.debian.org/debian-lts-announce/2024/10/msg00006.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-9680
