CVE-2024-20366
📋 TL;DR
This vulnerability in Cisco Crosswork NSO's Tail-f HCC function pack allows authenticated local attackers to escalate privileges to root by manipulating executable file search paths. Attackers need valid credentials on affected devices. The vulnerability affects Cisco Crosswork Network Services Orchestrator installations with the Tail-f HCC function pack.
💻 Affected Systems
- Cisco Crosswork Network Services Orchestrator
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level arbitrary code execution, allowing attackers to install persistent backdoors, exfiltrate sensitive data, or disrupt network operations.
Likely Case
Privilege escalation from a lower-privileged user to root, enabling lateral movement within the network and potential compromise of other systems.
If Mitigated
Limited impact if proper access controls, least privilege principles, and network segmentation are implemented to restrict local user access.
🎯 Exploit Status
Requires valid local credentials and ability to configure the application to execute malicious files via path manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 7.1.1 or later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-hcc-priv-esc-OWBWCs5D
Restart Required: Yes
Instructions:
1. Download Cisco Crosswork NSO version 7.1.1 or later from Cisco Software Center. 2. Backup current configuration and data. 3. Install the updated version following Cisco's upgrade documentation. 4. Restart the NSO service to apply changes.
🔧 Temporary Workarounds
Restrict Local User Access
linuxLimit local user accounts to only essential personnel and implement strict access controls.
Implement Least Privilege
linuxEnsure users only have necessary permissions and cannot modify application configurations.
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts and monitor for suspicious activity.
- Isolate affected systems using network segmentation to contain potential breaches.
🔍 How to Verify
Check if Vulnerable:
Check NSO version with 'ncs --version' and verify if Tail-f HCC function pack is installed and version is below 7.1.1.Check Version:
ncs --versionVerify Fix Applied:
Confirm NSO version is 7.1.1 or higher using 'ncs --version' and verify the patch is applied via Cisco's advisory verification steps.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Suspicious file execution from non-standard paths
- Configuration changes to HCC function pack
Network Indicators:
- Unexpected outbound connections from NSO servers
- Anomalous authentication patterns
SIEM Query:
source="NSO" AND (event_type="privilege_escalation" OR event_type="config_change" AND component="HCC")