CVE-2021-1462
📋 TL;DR
This vulnerability allows authenticated local administrators on Cisco SD-WAN vManage Software to escalate their privileges to root level. Attackers need valid administrator credentials to exploit this flaw by creating malicious files that the system later processes. Only Cisco SD-WAN vManage installations with local administrator accounts are affected.
💻 Affected Systems
- Cisco SD-WAN vManage Software
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, allowing attackers to install persistent backdoors, exfiltrate sensitive network configuration data, or disrupt SD-WAN operations.
Likely Case
Privilege escalation from administrator to root, enabling attackers to bypass security controls, modify system configurations, or access restricted data.
If Mitigated
Limited impact if proper access controls restrict administrator accounts and systems are isolated from critical infrastructure.
🎯 Exploit Status
Exploitation requires authenticated administrator access and knowledge of file creation techniques; no public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.3.1, 20.4.1, 20.5.1 or later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-privesc-vman-kth3c82B
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download appropriate fixed version from Cisco Software Center. 3. Follow Cisco SD-WAN vManage upgrade procedures. 4. Verify upgrade completion and functionality.
🧯 If You Can't Patch
- Restrict local administrator account access to trusted personnel only.
- Implement strict monitoring and logging of administrator activities and file creation events.
🔍 How to Verify
Check if Vulnerable:
Check vManage software version via CLI: show version | include vManageCheck Version:
show version | include vManageVerify Fix Applied:
Verify version is 20.3.1, 20.4.1, 20.5.1 or later using: show version | include vManage📡 Detection & Monitoring
Log Indicators:
- Unusual file creation by administrator accounts
- Privilege escalation attempts in system logs
- Unexpected root-level access patterns
Network Indicators:
- Anomalous administrative access patterns to vManage CLI
SIEM Query:
source="vmanage" AND (event_type="file_creation" AND user="admin") OR (event_type="privilege_escalation")