CVE-2025-34352
📋 TL;DR
This vulnerability allows local low-privileged attackers to achieve arbitrary file writes or deletions on Windows systems by exploiting insecure temporary directory handling in JumpCloud Remote Assist. Attackers can escalate privileges to SYSTEM or cause denial of service by overwriting critical system files. Only affects Windows systems with vulnerable versions of JumpCloud Remote Assist installed.
💻 Affected Systems
- JumpCloud Remote Assist for Windows
⚠️ 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
Local privilege escalation to SYSTEM, arbitrary file deletion/write leading to complete system compromise or permanent denial of service.
Likely Case
Local privilege escalation to SYSTEM by an authenticated low-privileged user, potentially leading to lateral movement within the network.
If Mitigated
Limited to local attacks requiring authenticated access; proper access controls and monitoring would detect suspicious file operations.
🎯 Exploit Status
Requires local access and knowledge of the predictable temporary directory path; involves race conditions and symbolic link manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.317.0
Vendor Advisory: https://jumpcloud.com/support/list-of-jumpcloud-agent-release-notes
Restart Required: Yes
Instructions:
1. Update JumpCloud Windows Agent to latest version. 2. Ensure Remote Assist component updates to 0.317.0+. 3. Restart affected Windows systems.
🔧 Temporary Workarounds
Remove JumpCloud Remote Assist
windowsUninstall JumpCloud Remote Assist component if not required
Uninstall via JumpCloud console or Windows Add/Remove Programs
Restrict local user access
windowsLimit local user accounts and implement strict access controls
🧯 If You Can't Patch
- Monitor for suspicious file operations in %TEMP% directories related to JumpCloud processes
- Implement application whitelisting to prevent unauthorized privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check JumpCloud Remote Assist version via JumpCloud console or check installed version on Windows systemCheck Version:
Check JumpCloud Agent version in system tray or via JumpCloud consoleVerify Fix Applied:
Confirm JumpCloud Remote Assist version is 0.317.0 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual file operations in %TEMP% directories by SYSTEM account
- JumpCloud Remote Assist uninstall/update operations
Network Indicators:
- No network indicators - local vulnerability only
SIEM Query:
Windows Event ID 4663 (File system access) showing SYSTEM account writing to user-writable temp directories