CVE-2024-55884
📋 TL;DR
A heap-based out-of-bounds write vulnerability in Mullvad VPN client's exception logging component allows potential memory corruption when the alternate stack is exhausted. This affects Mullvad VPN desktop, iOS, and Android clients. While achieving remote code execution is considered non-trivial, successful exploitation could compromise the VPN client.
💻 Affected Systems
- Mullvad VPN Desktop Client
- Mullvad VPN iOS Client
- Mullvad VPN Android Client
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, though this is considered difficult to achieve according to the CVE description.
Likely Case
Application crash or denial of service affecting VPN connectivity.
If Mitigated
Limited impact with proper network segmentation and endpoint protection.
🎯 Exploit Status
The CVE description notes achieving code execution is considered non-trivial, suggesting exploitation requires specific conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after the commit ef6c862071b26023802b00d6e1dc6ca53d1ab3e6
Vendor Advisory: https://github.com/mullvad/mullvadvpn-app/commit/ef6c862071b26023802b00d6e1dc6ca53d1ab3e6
Restart Required: Yes
Instructions:
1. Update Mullvad VPN client to latest version. 2. Restart the VPN client. 3. Verify version is updated.
🔧 Temporary Workarounds
Disable VPN Client
allTemporarily stop using the vulnerable VPN client until patched.
🧯 If You Can't Patch
- Implement network segmentation to limit VPN client exposure
- Deploy endpoint protection with memory corruption detection
🔍 How to Verify
Check if Vulnerable:
Check Mullvad VPN client version in application settings or about section.Check Version:
Check application settings or run 'mullvad version' on command line for desktop clients.Verify Fix Applied:
Verify client version is newer than affected versions: Desktop > 2024.6, iOS > 2024.8, Android > 2024.8-beta1.📡 Detection & Monitoring
Log Indicators:
- Application crashes of Mullvad VPN client
- Memory access violation errors in system logs
Network Indicators:
- Unusual VPN disconnections
- Abnormal traffic patterns from VPN client
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName contains 'mullvad'