CVE-2021-31160
📋 TL;DR
This vulnerability in Zoho ManageEngine ServiceDesk Plus MSP allows attackers to access internal data without proper authentication. It affects organizations using ServiceDesk Plus MSP for IT service management. The vulnerability enables unauthorized access to sensitive information stored within the application.
💻 Affected Systems
- Zoho ManageEngine ServiceDesk Plus MSP
📦 What is this software?
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
Manageengine Servicedesk Plus Msp by Zohocorp
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of internal organizational data including customer information, service tickets, configuration data, and potentially credentials.
Likely Case
Unauthorized access to sensitive service desk data, potentially exposing customer information, internal communications, and operational details.
If Mitigated
Limited data exposure with proper network segmentation and access controls in place.
🎯 Exploit Status
The vulnerability allows access to internal data without authentication, suggesting relatively simple exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10521
Vendor Advisory: https://www.manageengine.com/products/service-desk-msp/readme.html#10521
Restart Required: Yes
Instructions:
1. Download ServiceDesk Plus MSP version 10521 or later from ManageEngine website. 2. Backup current installation and data. 3. Run the installer to upgrade to version 10521. 4. Restart the ServiceDesk Plus MSP service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to ServiceDesk Plus MSP to only trusted internal networks.
Access Control Lists
allImplement firewall rules to limit access to the application from specific IP ranges only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the ServiceDesk Plus MSP instance
- Deploy web application firewall (WAF) with rules to detect and block unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check the ServiceDesk Plus MSP version in the application interface or installation directory. Versions below 10521 are vulnerable.Check Version:
Check the version in the application web interface under Help > About, or examine the installation directory for version files.Verify Fix Applied:
Verify the application version shows 10521 or higher after patching and test that unauthorized data access is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to internal data endpoints
- Requests to sensitive data without authentication
- Access from unexpected IP addresses
Network Indicators:
- Unusual HTTP requests to internal API endpoints
- Data exfiltration patterns from the application
SIEM Query:
source="servicedesk-msp" AND (url_path="/internal/*" OR status=200) AND user="anonymous"🔗 References
- https://cds.thalesgroup.com/en/tcs-cert/CVE-2021-31160
- https://excellium-services.com/cert-xlm-advisory/cve-2021-31160/
- https://www.manageengine.com/products/service-desk-msp/readme.html#10521
- https://excellium-services.com/cert-xlm-advisory/cve-2021-31160/
- https://www.manageengine.com/products/service-desk-msp/readme.html#10521
