CVE-2022-20860
📋 TL;DR
This vulnerability allows an unauthenticated remote attacker to perform man-in-the-middle attacks on SSL/TLS connections between Cisco Nexus Dashboard and its controllers, potentially altering communications or stealing sensitive information like administrator credentials. It affects Cisco Nexus Dashboard deployments connecting to Cisco APIC, Cloud APIC, or Nexus Dashboard Fabric Controller.
💻 Affected Systems
- Cisco Nexus Dashboard
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could intercept and manipulate all traffic, steal administrator credentials, and gain full control over associated controllers, leading to data breaches or network disruption.
Likely Case
Attackers could eavesdrop on sensitive data, such as configuration details or credentials, and potentially inject malicious commands or data into communications.
If Mitigated
With proper patching and network segmentation, the risk is minimized, but residual risk exists if attackers have internal network access.
🎯 Exploit Status
Exploitation depends on network access to intercept traffic; public exploits are not widely reported, but the vulnerability is well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Cisco Nexus Dashboard version 2.2(1e) or later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nd-tlsvld-TbAQLp3N
Restart Required: Yes
Instructions:
1. Backup configuration and data. 2. Download the patch from Cisco's software download page. 3. Apply the update via the Nexus Dashboard GUI or CLI. 4. Restart the device as required. 5. Verify the update and re-establish connections to controllers.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Cisco Nexus Dashboard and controller traffic to trusted network segments to reduce man-in-the-middle attack surface.
Certificate Validation Enforcement
allManually configure SSL/TLS settings to enforce certificate validation if supported, though patching is recommended.
🧯 If You Can't Patch
- Implement strict network access controls and monitor for unusual traffic between Nexus Dashboard and controllers.
- Use VPNs or encrypted tunnels for all communications to add an extra layer of security.
🔍 How to Verify
Check if Vulnerable:
Check the Cisco Nexus Dashboard version via the GUI or CLI; if prior to 2.2(1e), it is vulnerable.Check Version:
show version (via CLI) or check System > About in the GUI.Verify Fix Applied:
After patching, confirm the version is 2.2(1e) or later and test SSL/TLS connections to controllers for proper certificate validation.📡 Detection & Monitoring
Log Indicators:
- Look for SSL/TLS handshake failures or warnings related to certificate validation in system logs.
Network Indicators:
- Monitor for unexpected man-in-the-middle activity or unusual traffic patterns between Nexus Dashboard and controllers.
SIEM Query:
Example: 'source="nexus-dashboard" AND (event_type="ssl_error" OR certificate_validation="failed")'