CVE-2022-22551
📋 TL;DR
Dell EMC AppSync versions 3.9 to 4.3 transmit sensitive session information via GET request query strings, which can be intercepted by adjacent attackers. This allows session hijacking without authentication, affecting organizations using vulnerable AppSync deployments.
💻 Affected Systems
- Dell EMC AppSync
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of AppSync management console leading to data exfiltration, backup manipulation, or ransomware deployment across managed systems.
Likely Case
Unauthorized access to AppSync console allowing attackers to view sensitive backup configurations, modify schedules, or disrupt operations.
If Mitigated
Limited impact due to network segmentation and proper access controls preventing adjacent network access.
🎯 Exploit Status
Exploitation requires network sniffing or MITM position on same network segment. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3.1 and later
Vendor Advisory: https://www.dell.com/support/kbdoc/000195377
Restart Required: Yes
Instructions:
1. Download AppSync 4.3.1 or later from Dell support site. 2. Backup current configuration. 3. Run installer with administrative privileges. 4. Restart AppSync services.
🔧 Temporary Workarounds
Network Segmentation
allIsolate AppSync management interface to dedicated VLAN with strict access controls.
HTTPS Enforcement
allConfigure AppSync to require HTTPS only and disable HTTP access.
Edit AppSync configuration to set 'force_https=true' in web server settings
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted administrative systems to communicate with AppSync management interface.
- Deploy network monitoring to detect unusual GET requests containing session tokens or sensitive parameters.
🔍 How to Verify
Check if Vulnerable:
Check AppSync version via web interface or installation directory. Versions 3.9-4.3 are vulnerable.Check Version:
On Windows: Check 'C:\Program Files\Dell\AppSync\version.txt' or web interface login page. On Linux: Check '/opt/dell/appsync/version.txt'Verify Fix Applied:
Verify version is 4.3.1 or later and test that session tokens are no longer transmitted in URL query strings.📡 Detection & Monitoring
Log Indicators:
- GET requests containing 'session', 'token', 'auth' parameters in query strings
- Multiple failed login attempts followed by successful access from new IP
Network Indicators:
- Unencrypted HTTP traffic containing sensitive parameters
- Session tokens in URL parameters
SIEM Query:
source="appsync" AND (url="*session=*" OR url="*token=*" OR url="*auth=*") AND method="GET"