CVE-2021-47878
📋 TL;DR
CVE-2021-47878 is an unquoted service path vulnerability in eBeam Education Suite's Device Service that allows local attackers to execute arbitrary code with LocalSystem privileges. This affects systems running eBeam Education Suite 2.5.0.9 where an attacker has local access. The vulnerability enables privilege escalation from a lower-privileged user account to full system control.
💻 Affected Systems
- eBeam Education 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 with LocalSystem privileges, allowing attackers to install persistent malware, steal credentials, disable security controls, and pivot to other systems.
Likely Case
Local privilege escalation leading to installation of backdoors, credential harvesting, and lateral movement within the network.
If Mitigated
Limited impact if proper access controls prevent local users from writing to service path directories and service runs with minimal privileges.
🎯 Exploit Status
Exploit requires local access to the system. Attackers need write permissions to directories in the service path. Public exploit code is available on Exploit-DB (ID 49647).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://esvc000385.wic045u.server-web.com/Downloads/eBeam/
Restart Required: Yes
Instructions:
1. Check vendor website for updated version. 2. If patch available, download and install. 3. Restart the eBeam Device Service. 4. Verify service path is properly quoted in registry.
🔧 Temporary Workarounds
Quote Service Path
windowsManually add quotes around the service executable path in Windows Registry
reg add "HKLM\SYSTEM\CurrentControlSet\Services\eBeamDeviceService" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\eBeam\eBeamDeviceService.exe\"" /f
Restrict Directory Permissions
windowsRemove write permissions for non-administrative users on directories in the service path
icacls "C:\Program Files\eBeam" /deny Users:(OI)(CI)W
icacls "C:\Program Files" /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Remove unnecessary user write permissions to directories in the service path (C:\Program Files\eBeam and parent directories)
- Monitor for suspicious file creation in service path directories and service registry modifications
🔍 How to Verify
Check if Vulnerable:
Check registry: reg query "HKLM\SYSTEM\CurrentControlSet\Services\eBeamDeviceService" /v ImagePath. If path contains spaces and is not enclosed in quotes, system is vulnerable.Check Version:
Check eBeam Education Suite version in Control Panel > Programs and Features or run: wmic product where name="eBeam Education Suite" get versionVerify Fix Applied:
Verify ImagePath registry value is enclosed in quotes and check that non-admin users cannot write to service path directories.📡 Detection & Monitoring
Log Indicators:
- Windows Event ID 4688: New process creation from service path directories
- Windows Event ID 7045: Service installation/modification
- Unexpected executable files in C:\Program Files\eBeam directory
Network Indicators:
- Unusual outbound connections from eBeamDeviceService.exe
- SMB/network scanning originating from affected systems
SIEM Query:
source="windows" AND (event_id=4688 AND process_path="*Program Files*eBeam*" AND user!="SYSTEM") OR (event_id=7045 AND service_name="eBeamDeviceService")