CVE-2021-21564
📋 TL;DR
Dell OpenManage Enterprise versions before 3.6.1 have an improper authentication vulnerability that allows remote unauthenticated attackers to hijack elevated sessions or perform unauthorized actions by sending malformed data. This affects organizations using vulnerable versions of Dell's enterprise management software.
💻 Affected Systems
- Dell OpenManage Enterprise
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the OpenManage Enterprise system, allowing attackers to execute arbitrary commands, access sensitive server management data, and potentially pivot to managed systems.
Likely Case
Unauthorized administrative access to the management console, enabling configuration changes, credential theft, and disruption of managed infrastructure.
If Mitigated
Limited impact if system is isolated behind firewalls with strict network controls, though authentication bypass remains possible.
🎯 Exploit Status
The vulnerability requires sending malformed data but does not require authentication, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.6.1 or later
Vendor Advisory: https://www.dell.com/support/kbdoc/000189673
Restart Required: Yes
Instructions:
1. Download OpenManage Enterprise version 3.6.1 or later from Dell Support. 2. Backup current configuration. 3. Apply the update through the administration console. 4. Restart the OpenManage Enterprise service or appliance.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to OpenManage Enterprise to only trusted administrative networks
Firewall Rules
allImplement strict firewall rules to limit access to OpenManage Enterprise ports (default 443/HTTPS)
🧯 If You Can't Patch
- Isolate the OpenManage Enterprise system on a dedicated management VLAN with strict access controls
- Implement network monitoring and intrusion detection specifically for OpenManage Enterprise traffic
🔍 How to Verify
Check if Vulnerable:
Check the OpenManage Enterprise version in the administration console under Help > About. If version is below 3.6.1, the system is vulnerable.Check Version:
In OpenManage Enterprise web interface, navigate to Help > About to view version information.Verify Fix Applied:
After patching, verify the version shows 3.6.1 or higher in the administration console and test authentication requirements for all administrative functions.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful administrative actions from same IP
- Unusual administrative activity from unexpected IP addresses
- Multiple malformed request patterns in web server logs
Network Indicators:
- Unusual traffic patterns to OpenManage Enterprise port 443 from non-administrative networks
- HTTP requests with malformed authentication headers
SIEM Query:
source="OpenManage" AND (event_type="authentication_failure" OR event_type="administrative_action") | stats count by src_ip, user | where count > threshold