CVE-2021-36312
📋 TL;DR
Dell EMC CloudLink versions 7.1 and earlier contain hard-coded credentials that allow remote attackers with knowledge of these credentials to gain unauthorized administrative access. This affects all deployments of CloudLink 7.1 and prior versions. Attackers can potentially take full control of affected systems.
💻 Affected Systems
- Dell EMC CloudLink
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to access sensitive data, modify configurations, deploy malware, or use the system as a pivot point for further network attacks.
Likely Case
Unauthorized administrative access leading to data theft, configuration changes, or service disruption.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to CloudLink interfaces.
🎯 Exploit Status
Exploitation requires knowledge of hard-coded credentials but is trivial once obtained. No authentication bypass needed beyond credential knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 7.1.1 or later
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000193031/https-dellservices-lightning-force-com-one-one-app
Restart Required: Yes
Instructions:
1. Download CloudLink 7.1.1 or later from Dell support portal. 2. Backup current configuration. 3. Apply the update following Dell's upgrade procedures. 4. Restart the appliance. 5. Verify new credentials are in use.
🔧 Temporary Workarounds
Network Segmentation
allIsolate CloudLink appliance from untrusted networks and limit access to authorized IPs only.
Access Control Lists
allImplement firewall rules to restrict access to CloudLink management interfaces.
🧯 If You Can't Patch
- Immediately change all passwords and credentials used by CloudLink if possible
- Implement strict network segmentation and monitor all access to CloudLink interfaces
🔍 How to Verify
Check if Vulnerable:
Check CloudLink version via web interface or CLI. If version is 7.1 or earlier, system is vulnerable.Check Version:
Check via CloudLink web interface or appliance consoleVerify Fix Applied:
Verify version is 7.1.1 or later and test that old hard-coded credentials no longer work.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts with known hard-coded credentials
- Successful logins from unexpected IP addresses
- Configuration changes from unauthorized users
Network Indicators:
- Unauthorized access attempts to CloudLink management ports (typically 443/HTTPS)
- Traffic patterns indicating credential brute-forcing
SIEM Query:
source="cloudlink" AND (event_type="authentication" AND (username="hardcoded_user" OR result="success" from suspicious_ip))