CVE-2021-47879
📋 TL;DR
CVE-2021-47879 is an unquoted service path vulnerability in eBeam Interactive Suite 3.6's eBeam Stylus Driver service. Local attackers can place malicious executables in the unquoted path to execute arbitrary code with LocalSystem privileges. This affects Windows systems running the vulnerable software.
💻 Affected Systems
- eBeam Interactive Suite
⚠️ 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
Full system compromise via LocalSystem privilege escalation leading to complete administrative control, data theft, and persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to gain SYSTEM-level access, install malware, or pivot to other systems on the network.
If Mitigated
Limited impact if proper access controls prevent local users from writing to Program Files directories and service paths are monitored.
🎯 Exploit Status
Exploit requires local access to create files in the vulnerable path; exploit code is publicly available on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - vendor advisory not found in references
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Check vendor website for updates. 2. If patch available, download and install. 3. Restart system to apply changes. 4. Verify service path is properly quoted.
🔧 Temporary Workarounds
Quote Service Path
windowsManually modify the service configuration to use quoted paths in the service executable path.
sc config "eBeam Stylus Driver" binPath="\"C:\Program Files (x86)\Luidia\eBeam Stylus Driver\ebeamstylusdriver.exe\""
Restrict Filesystem Permissions
windowsSet strict ACLs on the vulnerable directory to prevent unauthorized file creation.
icacls "C:\Program Files (x86)\Luidia\eBeam Stylus Driver" /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Uninstall eBeam Interactive Suite if not required
- Implement strict endpoint detection and monitoring for file creation in vulnerable paths
🔍 How to Verify
Check if Vulnerable:
Check if the eBeam Stylus Driver service path is unquoted: sc qc "eBeam Stylus Driver" | findstr BINARY_PATH_NAMECheck Version:
Check program version in Control Panel or registry: reg query "HKLM\SOFTWARE\WOW6432Node\Luidia\eBeam Interactive Suite" /v VersionVerify Fix Applied:
Verify service path is quoted and no unauthorized executables exist in the vulnerable directory.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs: Service Control Manager events (ID 7045) showing service path modifications
- Security logs: Unauthorized file creation in C:\Program Files (x86)\Luidia\eBeam Stylus Driver\
Network Indicators:
- Unusual outbound connections from system processes post-exploitation
SIEM Query:
EventID=7045 AND ServiceName="eBeam Stylus Driver" OR FileCreation IN ("C:\\Program Files (x86)\\Luidia\\eBeam Stylus Driver\\*")