CVE-2024-7529
📋 TL;DR
This vulnerability allows malicious websites to partially obscure security permission prompts using the date picker interface, potentially tricking users into granting unintended permissions. It affects Firefox, Firefox ESR, and Thunderbird browsers across multiple versions. The issue stems from a UI overlay weakness that enables clickjacking-style attacks.
💻 Affected Systems
- Firefox
- Firefox ESR
- Thunderbird
📦 What is this software?
Firefox by Mozilla
Firefox Esr by Mozilla
Firefox Esr by Mozilla
Thunderbird by Mozilla
Thunderbird by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Users could be tricked into granting camera, microphone, location, or other sensitive permissions to malicious websites, leading to privacy violations, data theft, or further exploitation.
Likely Case
Malicious sites could obtain permissions users didn't intend to grant, potentially accessing sensitive device features or data.
If Mitigated
With proper browser updates and user awareness, the risk is minimal as the vulnerability requires user interaction and specific conditions.
🎯 Exploit Status
Exploitation requires user interaction (clicking on obscured prompts) and a malicious website, but the technique is straightforward once the vulnerability is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 129+, Firefox ESR 115.14+, Firefox ESR 128.1+, Thunderbird 128.1+, Thunderbird 115.14+
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2024-33/
Restart Required: Yes
Instructions:
1. Open affected browser. 2. Go to Settings/Preferences > General/About. 3. Allow browser to check for and install updates. 4. Restart browser when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents malicious websites from executing the overlay attack, but breaks most modern web functionality.
about:config > javascript.enabled = false
Use Permission Default-Deny
allConfigure browsers to deny permission requests by default and require explicit user approval.
about:preferences#privacy > Permissions section > Set all to 'Block'
🧯 If You Can't Patch
- Use alternative browsers not affected by this vulnerability
- Implement network filtering to block known malicious websites
🔍 How to Verify
Check if Vulnerable:
Check browser version in About dialog; if version matches affected ranges, system is vulnerable.Check Version:
Firefox/Thunderbird: about:support or Help > AboutVerify Fix Applied:
Verify browser version is at or above patched versions: Firefox 129+, Firefox ESR 115.14+/128.1+, Thunderbird 128.1+/115.14+.📡 Detection & Monitoring
Log Indicators:
- Unusual permission grants in browser logs
- Multiple permission requests from same domain
Network Indicators:
- Connections to domains with known malicious reputation requesting sensitive permissions
SIEM Query:
source="browser_logs" AND (event="permission_granted" OR event="permission_requested") AND user_interaction="suspicious"🔗 References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1903187
- https://www.mozilla.org/security/advisories/mfsa2024-33/
- https://www.mozilla.org/security/advisories/mfsa2024-34/
- https://www.mozilla.org/security/advisories/mfsa2024-35/
- https://www.mozilla.org/security/advisories/mfsa2024-37/
- https://www.mozilla.org/security/advisories/mfsa2024-38/
