CVE-2024-20284
📋 TL;DR
This vulnerability allows authenticated local attackers with Python execution privileges on Cisco NX-OS devices to escape the Python sandbox and execute arbitrary commands on the underlying operating system. It affects Cisco Nexus switches running vulnerable NX-OS software versions. Attackers need valid credentials and specific privileges to exploit this.
💻 Affected Systems
- Cisco Nexus switches with NX-OS software
📦 What is this software?
Nx Os by Cisco
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full control of the network device, enabling network disruption, data exfiltration, lateral movement, and persistence.
Likely Case
Privilege escalation from low-privileged user to root/admin access on the device, allowing configuration changes and further attacks.
If Mitigated
Limited to authorized users with proper privilege separation; impact contained to specific device functions.
🎯 Exploit Status
Requires authenticated access with specific Python privileges and knowledge of Python sandbox escape techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for fixed versions per product
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-psbe-ce-YvbTn5du
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and install fixed software version. 3. Reboot device after upgrade. 4. Verify upgrade completed successfully.
🔧 Temporary Workarounds
Restrict Python execution privileges
allLimit user access to Python execution capabilities to only necessary personnel
Configure role-based access control to remove Python execution from unnecessary users
Monitor Python script execution
allEnable logging and monitoring of Python script execution on devices
Configure logging for Python execution events
🧯 If You Can't Patch
- Implement strict access controls - only grant Python execution privileges to absolutely necessary users
- Monitor for unusual Python script execution patterns and review logs regularly
🔍 How to Verify
Check if Vulnerable:
Check NX-OS version against affected versions in Cisco advisoryCheck Version:
show versionVerify Fix Applied:
Verify NX-OS version is updated to fixed version listed in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual Python script execution patterns
- Privilege escalation attempts
- Unexpected command execution
Network Indicators:
- Unusual configuration changes
- Unexpected outbound connections from network devices
SIEM Query:
Search for Python execution logs followed by privilege escalation or unusual command execution🔗 References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-psbe-ce-YvbTn5du
- https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/105x/programmability/cisco-nexus-9000-series-nx-os-programmability-guide-105x/m-n9k-python-api-101x.html?bookSearch=true#concept_A2CFF094ADCB414C983EA06AD8E9A410
