CVE-2018-0349
📋 TL;DR
This vulnerability in Cisco SD-WAN Solution allows authenticated remote attackers to overwrite arbitrary files on affected devices, potentially leading to root privilege escalation. It affects multiple Cisco SD-WAN components including vBond, vEdge routers, vManage, and vSmart Controller. The issue stems from improper input validation in the request admin-tech CLI command.
💻 Affected Systems
- vBond Orchestrator Software
- vEdge 100 Series Routers
- vEdge 1000 Series Routers
- vEdge 2000 Series Routers
- vEdge 5000 Series Routers
- vEdge Cloud Router Platform
- vManage Network Management Software
- vSmart Controller Software
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains root access to affected devices, completely compromising the SD-WAN infrastructure, allowing data exfiltration, network manipulation, and persistent backdoor installation.
Likely Case
Authenticated attacker with network access overwrites critical system files to escalate privileges to root, gaining full control of affected devices.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated segments, though compromised devices still pose significant risk.
🎯 Exploit Status
Exploitation requires authenticated CLI access but is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Release 18.3.0 or later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180718-sdwan-fo
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download and install Cisco SD-WAN Solution Release 18.3.0 or later from Cisco Software Center. 3. Apply update to all affected components. 4. Reboot devices as required. 5. Verify successful update and functionality.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit CLI access to only trusted administrative users and networks using access control lists and authentication mechanisms.
Network Segmentation
allIsolate SD-WAN management interfaces from untrusted networks and implement strict firewall rules.
🧯 If You Can't Patch
- Implement strict network access controls to limit which IP addresses can access SD-WAN management interfaces
- Enforce multi-factor authentication and strong credential policies for all administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check current software version on affected devices using 'show version' command in CLI and verify if version is prior to 18.3.0Check Version:
show versionVerify Fix Applied:
After patching, run 'show version' command to confirm version is 18.3.0 or later on all affected components📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command execution patterns
- Multiple failed authentication attempts followed by successful login
- File modification events in system directories
Network Indicators:
- Unusual traffic patterns from SD-WAN management interfaces
- Connection attempts from unauthorized IP addresses to management ports
SIEM Query:
source="cisco-sdwan" AND (event_type="cli_command" AND command="request admin-tech*") OR (event_type="file_modification" AND path="/etc/*" OR path="/bin/*")