CVE-2022-22828
📋 TL;DR
CVE-2022-22828 is an insecure direct object reference vulnerability in Synametrics SynaMan file transfer software. It allows remote attackers to access unshared files by manipulating base64-encoded filename parameters in download URLs. Organizations using SynaMan versions before 5.0 are affected.
💻 Affected Systems
- Synametrics SynaMan
📦 What is this software?
Synaman by Synametrics
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all files stored on the SynaMan server, including sensitive documents, credentials, and proprietary data, potentially leading to data breach, regulatory violations, and reputational damage.
Likely Case
Unauthorized access to confidential files stored on the server, potentially exposing sensitive business information, personal data, or intellectual property.
If Mitigated
Limited impact with proper network segmentation, access controls, and monitoring, though the vulnerability still exists at the application layer.
🎯 Exploit Status
Public proof-of-concept code is available. Exploitation requires only modifying base64-encoded parameters in URLs, making it trivial for attackers with basic technical knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0 and later
Vendor Advisory: https://web.synametrics.com/SynamanVersionHistory.htm
Restart Required: Yes
Instructions:
1. Download SynaMan version 5.0 or later from Synametrics website. 2. Stop the SynaMan service. 3. Install the updated version. 4. Restart the SynaMan service. 5. Verify the version is 5.0 or higher.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to SynaMan web interface to trusted IP addresses only
Use firewall rules to limit access to SynaMan ports (default 80/443) to authorized networks
Disable File Sharing
allTemporarily disable file sharing functionality if not critically needed
Stop SynaMan service: systemctl stop synaman (Linux) or net stop SynaMan (Windows)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SynaMan servers from sensitive networks
- Deploy web application firewall (WAF) with rules to detect and block IDOR exploitation patterns
🔍 How to Verify
Check if Vulnerable:
Check if SynaMan version is below 5.0. Attempt to access files by manipulating download URL parameters with base64-encoded filenames.Check Version:
Check SynaMan web interface admin panel or run: synaman --version (Linux) or check installed programs list (Windows)Verify Fix Applied:
Verify SynaMan version is 5.0 or higher. Test that file download URLs properly validate user permissions and reject unauthorized file requests.📡 Detection & Monitoring
Log Indicators:
- Multiple failed file access attempts
- Access to files outside user's authorized directories
- Unusual file download patterns
Network Indicators:
- HTTP requests with manipulated base64 parameters in URLs
- Unusual spikes in file download traffic
SIEM Query:
source="synaman" AND (url="*download*" AND NOT user_authorized="true") OR (url="*base64*" AND status="200")