CVE-2023-20113
📋 TL;DR
This CSRF vulnerability in Cisco SD-WAN vManage allows unauthenticated attackers to trick authenticated users into performing malicious actions via malicious links. If exploited, attackers can modify configurations or delete accounts with the victim's privileges. All systems running affected vManage software versions are vulnerable.
💻 Affected Systems
- Cisco SD-WAN vManage Software
📦 What is this software?
Sd Wan by Cisco
Sd Wan by Cisco
Sd Wan by Cisco
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attacker gains administrative control, modifies network configurations, deletes critical accounts, or disrupts SD-WAN operations.
Likely Case
Unauthorized configuration changes leading to network disruption, data exposure, or privilege escalation within the vManage environment.
If Mitigated
Limited impact with proper CSRF protections, network segmentation, and user awareness training preventing successful exploitation.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious links. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.6.5.1, 20.9.3.4, 20.10.1.2 or later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vman-csrf-76RDbLEh
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download appropriate patched version from Cisco Software Center. 3. Follow Cisco SD-WAN vManage upgrade documentation. 4. Verify successful upgrade and functionality.
🔧 Temporary Workarounds
Implement CSRF Tokens Manually
linuxAdd custom CSRF protection headers to web interface requests
Requires custom web server configuration - consult Cisco documentation for specific implementation
Network Segmentation
linuxRestrict access to vManage web interface to trusted networks only
firewall-cmd --permanent --zone=trusted --add-service=https
firewall-cmd --reload
🧯 If You Can't Patch
- Implement strict network access controls to limit vManage interface exposure
- Enable multi-factor authentication and user awareness training about phishing risks
🔍 How to Verify
Check if Vulnerable:
Check vManage version via CLI: show version | include vManageCheck Version:
show version | include vManageVerify Fix Applied:
Verify version is 20.6.5.1, 20.9.3.4, 20.10.1.2 or later: show version | include vManage📡 Detection & Monitoring
Log Indicators:
- Unexpected configuration changes
- Account deletion/modification events
- Multiple failed login attempts followed by successful changes
Network Indicators:
- Unusual HTTP POST requests to vManage interface from unexpected sources
- CSRF token validation failures
SIEM Query:
source="vmanage" AND (event_type="config_change" OR event_type="user_modification") AND user_agent CONTAINS "malicious"