CVE-2024-42423
📋 TL;DR
This vulnerability allows local unauthenticated users with low privileges to bypass authorization controls in Citrix Workspace App when Citrix CEB is enabled for WebLogin on Dell ThinOS. Exploitation could lead to unauthorized information disclosure and system tampering. Only systems running the specific affected version combination are vulnerable.
💻 Affected Systems
- Citrix Workspace App
- Dell ThinOS
📦 What is this software?
Workspace by Citrix
Workspace by Citrix
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain unauthorized access to sensitive information, modify system configurations, or potentially escalate privileges within the Citrix environment.
Likely Case
Local users could access information or perform actions beyond their authorized permissions, potentially compromising session data or application settings.
If Mitigated
With proper access controls and monitoring, impact would be limited to isolated incidents that could be detected and contained.
🎯 Exploit Status
Exploitation requires local access to the system but no authentication
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to Dell ThinOS version with security fixes
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000225289/dsa-2024-229-security-update-for-dell-thinos-vulnerabilities
Restart Required: Yes
Instructions:
1. Review Dell advisory DSA-2024-229
2. Download and apply the latest ThinOS update from Dell support
3. Restart affected systems
4. Verify Citrix Workspace App functionality post-update
🔧 Temporary Workarounds
Disable Citrix CEB for WebLogin
allTemporarily disable the vulnerable configuration until patching can be completed
Restrict Local Access
allImplement physical and logical access controls to limit who can interact with ThinOS devices
🧯 If You Can't Patch
- Disable Citrix CEB WebLogin feature entirely
- Implement strict monitoring and alerting for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check ThinOS version (should be 2311) and verify Citrix Workspace App version 23.9.0.24.4 with CEB enabled for WebLoginCheck Version:
Check ThinOS system information in device settingsVerify Fix Applied:
Confirm ThinOS has been updated to a version after the security patch and verify Citrix CEB WebLogin configuration📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Citrix WebLogin components
- Unexpected configuration changes to Citrix settings
Network Indicators:
- Unusual authentication patterns from ThinOS devices
SIEM Query:
source="ThinOS" AND (event="unauthorized_access" OR event="config_change")