CVE-2024-10458
📋 TL;DR
This vulnerability allows a malicious website to bypass same-origin policy restrictions via embedded content, potentially accessing sensitive data from trusted sites. It affects Firefox, Firefox ESR, and Thunderbird users running outdated versions. Attackers could exploit this to steal user information or perform unauthorized actions.
💻 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
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of user session data, credentials, or sensitive information from trusted websites through cross-origin data leakage.
Likely Case
Limited data exfiltration from vulnerable embedded content, potentially exposing user-specific information or session tokens.
If Mitigated
No impact if browsers are updated to patched versions or if embedded content restrictions are properly configured.
🎯 Exploit Status
Exploitation requires user interaction (visiting a malicious site) but no authentication. The technical complexity involves crafting malicious embed/object elements to bypass same-origin policies.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 132+, Firefox ESR 128.4+, Firefox ESR 115.17+, Thunderbird 128.4+, Thunderbird 132+
Vendor Advisory: https://www.mozilla.org/security/advisories/
Restart Required: Yes
Instructions:
1. Open browser/email client. 2. Go to Settings/Preferences > General/About. 3. Allow automatic update check and installation. 4. Restart the application when prompted. 5. Verify version is updated to patched version.
🔧 Temporary Workarounds
Disable JavaScript for untrusted sites
allPrevents malicious scripts from exploiting the vulnerability by disabling JavaScript on untrusted websites.
about:config > javascript.enabled = false
Use NoScript or similar extensions
allBlocks scripts from untrusted sites by default, preventing exploitation.
Install NoScript extension from addons.mozilla.org
🧯 If You Can't Patch
- Restrict browser usage to trusted sites only using network policies
- Implement web content filtering to block malicious sites and embedded content
🔍 How to Verify
Check if Vulnerable:
Check browser version in About dialog. If version matches affected range, system is vulnerable.Check Version:
Firefox: about:support | grep 'Version'; Thunderbird: Help > About ThunderbirdVerify Fix Applied:
Verify version is updated to patched version in About dialog. Test with known safe embedded content.📡 Detection & Monitoring
Log Indicators:
- Unusual cross-origin requests in web server logs
- Multiple failed permission requests from same origin
Network Indicators:
- Suspicious embed/object element requests between unrelated domains
- Unexpected data transfers between trusted and untrusted sites
SIEM Query:
source="web_proxy" AND (url CONTAINS "embed" OR url CONTAINS "object") AND src_ip!=dest_ip AND status=200🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1921733
- https://www.mozilla.org/security/advisories/mfsa2024-55/
- https://www.mozilla.org/security/advisories/mfsa2024-56/
- https://www.mozilla.org/security/advisories/mfsa2024-57/
- https://www.mozilla.org/security/advisories/mfsa2024-58/
- https://www.mozilla.org/security/advisories/mfsa2024-59/
- https://lists.debian.org/debian-lts-announce/2024/10/msg00034.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00001.html
