CVE-2021-1142
📋 TL;DR
This critical vulnerability in Cisco Smart Software Manager Satellite allows unauthenticated remote attackers to execute arbitrary commands on the underlying operating system. Affected organizations are those running vulnerable versions of Cisco Smart Software Manager Satellite with internet-facing web interfaces.
💻 Affected Systems
- Cisco Smart Software Manager Satellite
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to install malware, exfiltrate data, pivot to internal networks, and maintain persistent access.
Likely Case
Remote code execution leading to data theft, service disruption, and potential ransomware deployment.
If Mitigated
Limited impact if system is isolated behind proper network segmentation and access controls.
🎯 Exploit Status
Multiple vulnerabilities in web UI allow unauthenticated command injection; exploitation is straightforward once details are known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 5.1.0 or later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cssm-multici-pgG5WM5A
Restart Required: Yes
Instructions:
1. Download Cisco Smart Software Manager Satellite version 5.1.0 or later from Cisco Software Center. 2. Follow Cisco's upgrade documentation for your deployment. 3. Restart the appliance after upgrade completion.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict access to Cisco Smart Software Manager Satellite web interface to trusted IP addresses only.
# Configure firewall rules to restrict access
# Example: iptables -A INPUT -p tcp --dport 443 -s trusted_ip -j ACCEPT
# iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Immediately isolate the system from internet access and restrict to internal management network only
- Implement strict network segmentation and monitor all traffic to/from the appliance
🔍 How to Verify
Check if Vulnerable:
Check current version via web UI or SSH: version should be earlier than 5.1.0Check Version:
ssh admin@cssm-satellite 'show version' or check via web UI dashboardVerify Fix Applied:
Verify version is 5.1.0 or later and test web UI functionality📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful access
- Web server logs showing suspicious HTTP requests to vulnerable endpoints
Network Indicators:
- Unusual outbound connections from CSSM appliance
- Traffic patterns indicating command and control communication
- Unexpected SSH or other service connections originating from appliance
SIEM Query:
source="cssm-satellite" AND (event_type="command_execution" OR http_request MATCH "*vulnerable_endpoint*")