CVE-2022-20780
📋 TL;DR
This vulnerability in Cisco Enterprise NFV Infrastructure Software allows attackers to escape from guest virtual machines to the host system, execute commands with root privileges, or leak sensitive host data to VMs. It affects organizations using Cisco NFVIS for network function virtualization. The high CVSS score reflects the severe impact of successful exploitation.
💻 Affected Systems
- Cisco Enterprise NFV Infrastructure Software (NFVIS)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the NFVIS host system, allowing attackers to gain root access, access all hosted VMs, steal sensitive data, and potentially pivot to other network segments.
Likely Case
Privilege escalation from guest VM to host, enabling unauthorized access to host resources, command execution, and data exfiltration from the host environment.
If Mitigated
Limited impact if proper network segmentation, access controls, and monitoring are in place, though the vulnerability still presents significant risk.
🎯 Exploit Status
Exploitation requires access to a guest VM on the affected NFVIS host. Public proof-of-concept details are available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: NFVIS 4.7.1 and later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-NFVIS-MUL-7DySRX9
Restart Required: Yes
Instructions:
1. Download NFVIS 4.7.1 or later from Cisco Software Center. 2. Backup current configuration. 3. Upgrade NFVIS following Cisco's upgrade procedures. 4. Verify successful upgrade and functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate NFVIS management interfaces and restrict access to guest VMs
Access Control
allImplement strict access controls and authentication for NFVIS management and guest VMs
🧯 If You Can't Patch
- Implement strict network segmentation to isolate NFVIS systems from critical infrastructure
- Enhance monitoring and logging for suspicious activity on NFVIS hosts and guest VMs
🔍 How to Verify
Check if Vulnerable:
Check NFVIS version via CLI: 'show version' and verify if version is prior to 4.7.1Check Version:
show versionVerify Fix Applied:
After upgrade, run 'show version' to confirm version is 4.7.1 or later📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to NFVIS management interfaces
- Suspicious command execution on NFVIS host
- Unexpected VM-to-host communication patterns
Network Indicators:
- Unusual network traffic between guest VMs and NFVIS host management interfaces
- Attempts to access NFVIS administrative services from guest VM networks
SIEM Query:
source="nfvis" AND (event_type="authentication_failure" OR command="privileged" OR process="vm_escape")🔗 References
- https://github.com/orangecertcc/security-research/security/advisories/GHSA-hrpq-384f-vrpg
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-NFVIS-MUL-7DySRX9
- https://github.com/orangecertcc/security-research/security/advisories/GHSA-hrpq-384f-vrpg
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-NFVIS-MUL-7DySRX9
