CVE-2020-27568
📋 TL;DR
CVE-2020-27568 involves insecure file permissions in Aviatrix Controller 5.3.1516 where multiple files and directories are world-writable. This allows attackers with access to modify critical system files, potentially leading to privilege escalation or system compromise. Organizations running Aviatrix Controller version 5.3.1516 are affected.
💻 Affected Systems
- Aviatrix Controller
📦 What is this software?
Controller by Aviatrix
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise through privilege escalation, allowing attackers to execute arbitrary code, steal sensitive data, or disrupt network operations.
Likely Case
Local privilege escalation leading to unauthorized access to controller resources and potential manipulation of network configurations.
If Mitigated
Limited impact due to Aviatrix's full encryption layer, but still presents a security weakness that could be combined with other vulnerabilities.
🎯 Exploit Status
Exploitation requires local access to the system. The vulnerability is straightforward to exploit once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 5.3.1516
Vendor Advisory: https://docs.aviatrix.com/HowTos/security_bulletin_article.html#insecure-file-permissions
Restart Required: Yes
Instructions:
1. Upgrade Aviatrix Controller to a version newer than 5.3.1516. 2. Follow Aviatrix upgrade documentation. 3. Restart the controller service after upgrade.
🔧 Temporary Workarounds
File Permission Hardening
linuxManually adjust permissions on world-writable files and directories identified in the vulnerability.
find /path/to/aviatrix -perm -o+w -type f -exec chmod o-w {} \;
find /path/to/aviatrix -perm -o+w -type d -exec chmod o-w {} \;
🧯 If You Can't Patch
- Implement strict access controls to limit who can access the Aviatrix Controller system.
- Monitor file system changes and implement file integrity monitoring on critical Aviatrix directories.
🔍 How to Verify
Check if Vulnerable:
Check if running Aviatrix Controller version 5.3.1516 using 'aviatrix-ctl version' command.Check Version:
aviatrix-ctl versionVerify Fix Applied:
Verify version is newer than 5.3.1516 and check file permissions with 'find /opt/aviatrix -perm -o+w -ls' (should return no results).📡 Detection & Monitoring
Log Indicators:
- Unexpected file permission changes in Aviatrix directories
- Unauthorized access attempts to controller files
Network Indicators:
- Unusual outbound connections from the controller system
SIEM Query:
source="aviatrix" AND (event_type="file_modification" OR event_type="permission_change")