CVE-2021-47831
📋 TL;DR
CVE-2021-47831 is a denial of service vulnerability in Sandboxie where attackers can crash the application by pasting an overly long string into the container folder input field. This affects users of Sandboxie 5.49.7 who have the application running and accessible to attackers. The vulnerability allows disruption of the sandboxing functionality but doesn't enable code execution.
💻 Affected Systems
- Sandboxie
⚠️ 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
Complete application crash leading to loss of sandboxed processes and potential data loss for applications running within Sandboxie at the time of crash.
Likely Case
Temporary denial of service where Sandboxie crashes and needs to be restarted, disrupting any sandboxed applications.
If Mitigated
Minimal impact if proper input validation is implemented or if the vulnerable field isn't exposed to untrusted users.
🎯 Exploit Status
Exploit requires user interaction with the GUI - attacker must be able to paste into the container folder field. Public exploit code is available on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.49.8 and later
Vendor Advisory: https://sandboxie-plus.com/
Restart Required: Yes
Instructions:
1. Download Sandboxie 5.49.8 or later from the official website. 2. Run the installer. 3. Follow installation prompts. 4. Restart the system or at least restart Sandboxie services.
🔧 Temporary Workarounds
Restrict GUI Access
windowsLimit access to the Sandboxie GUI to trusted users only
Input Validation Script
windowsImplement script to monitor and block excessive input in container folder field
🧯 If You Can't Patch
- Restrict physical and remote desktop access to systems running vulnerable Sandboxie
- Implement application whitelisting to prevent unauthorized users from accessing Sandboxie GUI
🔍 How to Verify
Check if Vulnerable:
Check Sandboxie version in Help > About. If version is 5.49.7, the system is vulnerable.Check Version:
In Sandboxie GUI: Help > About, or check registry: HKEY_LOCAL_MACHINE\SOFTWARE\SandboxieVerify Fix Applied:
After updating, verify version is 5.49.8 or higher in Help > About. Test by attempting to paste a large buffer into container folder field - application should not crash.📡 Detection & Monitoring
Log Indicators:
- Application crash logs for Sandboxie.exe
- Windows Event Logs showing application faults
Network Indicators:
- No network indicators - this is a local exploit
SIEM Query:
EventID=1000 AND SourceName="Application Error" AND ProcessName="Sandboxie.exe"