CVE-2024-20536
📋 TL;DR
This SQL injection vulnerability in Cisco Nexus Dashboard Fabric Controller allows authenticated users with read-only privileges to execute arbitrary SQL commands through REST API or web interface. Attackers could read, modify, or delete database data, potentially affecting device availability. Organizations using affected NDFC versions are at risk.
💻 Affected Systems
- Cisco Nexus Dashboard Fabric Controller (NDFC)
📦 What is this software?
Nexus Dashboard Fabric Controller by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the internal database leading to data destruction, configuration corruption, and permanent device unavailability requiring full rebuild.
Likely Case
Data exfiltration of sensitive network configuration information, modification of device settings, and potential lateral movement within the network.
If Mitigated
Limited impact due to network segmentation, read-only account restrictions, and proper input validation at other layers.
🎯 Exploit Status
Exploitation requires authenticated access but only read-only privileges. SQL injection vulnerabilities are typically easy to exploit with standard tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.3.1e and later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ndfc-sqli-CyPPAxrL
Restart Required: Yes
Instructions:
1. Download NDFC version 12.3.1e or later from Cisco Software Center. 2. Backup current configuration. 3. Apply the update following Cisco's NDFC upgrade documentation. 4. Restart the NDFC appliance.
🔧 Temporary Workarounds
Restrict API Access
allLimit access to the REST API endpoint and web management interface to only trusted IP addresses using network ACLs or firewall rules.
Minimize Privileged Accounts
allReview and reduce the number of accounts with read-only or higher privileges. Implement principle of least privilege.
🧯 If You Can't Patch
- Implement network segmentation to isolate NDFC from untrusted networks
- Deploy web application firewall (WAF) with SQL injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check NDFC version via web interface (Admin > About) or CLI command 'show version' and compare against affected versions.Check Version:
show versionVerify Fix Applied:
Confirm version is 12.3.1e or later and test the specific REST API endpoints with SQL injection payloads (in controlled environment).📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed authentication attempts followed by SQL-like patterns in request logs
- Unexpected database schema changes
Network Indicators:
- Unusual traffic patterns to REST API endpoints
- SQL keywords in HTTP POST/GET requests to NDFC
SIEM Query:
source="ndfc_logs" AND ("SELECT" OR "UNION" OR "INSERT" OR "DELETE" OR "DROP") AND status=200