CVE-2021-27483
📋 TL;DR
This vulnerability allows lower-privileged users on ZOLL Defibrillator Dashboard systems to escalate their privileges to administrative level through insecure filesystem permissions. It affects ZOLL Defibrillator Dashboard versions prior to 2.2. Healthcare organizations using these medical device management systems are primarily impacted.
💻 Affected Systems
- ZOLL Defibrillator Dashboard
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could gain full administrative control over the defibrillator dashboard, potentially allowing manipulation of critical medical device configurations, patient data access, or disruption of emergency medical equipment management.
Likely Case
A malicious insider or compromised user account could elevate privileges to administrative level, enabling unauthorized access to sensitive medical device data and configuration settings.
If Mitigated
With proper access controls and monitoring, the impact is limited to unauthorized privilege escalation attempts that can be detected and prevented.
🎯 Exploit Status
Exploitation requires local access to the system and knowledge of the insecure file permissions, but the technical complexity is low once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 2.2
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsma-21-161-01
Restart Required: Yes
Instructions:
1. Contact ZOLL Medical Corporation for the updated software. 2. Backup current configuration and data. 3. Install version 2.2 or later. 4. Restart the system. 5. Verify proper installation and functionality.
🔧 Temporary Workarounds
Restrict Local Access
allLimit physical and remote access to systems running the vulnerable software to only authorized administrative personnel.
Implement Least Privilege
allEnsure all user accounts have only the minimum necessary permissions and regularly audit user access levels.
🧯 If You Can't Patch
- Implement strict access controls and monitor for privilege escalation attempts
- Segment the network to isolate vulnerable systems from critical infrastructure
🔍 How to Verify
Check if Vulnerable:
Check the software version in the application's about/help menu or system information. If version is below 2.2, the system is vulnerable.Check Version:
Check application version through the software interface or consult system documentation for version verification methods.Verify Fix Applied:
Verify the software version shows 2.2 or higher after patching and test that standard users cannot access administrative files or functions.📡 Detection & Monitoring
Log Indicators:
- Unusual file access attempts by non-admin users
- Unexpected privilege changes
- Access to administrative directories by standard users
Network Indicators:
- Unusual authentication patterns or access from non-standard locations
SIEM Query:
source="windows-security" EventID=4663 ObjectType="File" SubjectUserName!="*admin*" ObjectName="*administrative*"