CVE-2017-14189
📋 TL;DR
CVE-2017-14189 is an authentication bypass vulnerability in Fortinet FortiWebManager 5.8.0 that allows any user who can access the administrative web interface to log in without providing valid credentials. This affects organizations using FortiWebManager 5.8.0 for web application firewall management. The vulnerability completely bypasses authentication controls.
💻 Affected Systems
- Fortinet FortiWebManager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the FortiWebManager system, allowing attackers to reconfigure web application firewall rules, disable security controls, access sensitive configuration data, and potentially pivot to other network systems.
Likely Case
Unauthorized administrative access leading to modification of web application security policies, exposure of sensitive configuration data, and potential disruption of web application protection.
If Mitigated
Limited impact if the system is isolated behind network segmentation, has strict access controls, and is monitored for unauthorized access attempts.
🎯 Exploit Status
The vulnerability requires no authentication and can be exploited by simply accessing the login page with any password. Public exploit code and details are available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.8.1 and later
Vendor Advisory: https://fortiguard.com/advisory/FG-IR-17-248
Restart Required: Yes
Instructions:
1. Download FortiWebManager 5.8.1 or later from Fortinet support portal. 2. Backup current configuration. 3. Upload and install the new firmware. 4. Reboot the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to FortiWebManager administrative interface to only trusted management networks using firewall rules.
Disable Web Interface
fortinetTemporarily disable the web administrative interface and use CLI management only until patching can be completed.
config system interface
edit <interface_name>
set allowaccess ping https ssh
next
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiWebManager from untrusted networks
- Enable detailed logging and monitoring for any access attempts to the administrative interface
🔍 How to Verify
Check if Vulnerable:
Check FortiWebManager version via web interface or CLI. If version is exactly 5.8.0, the system is vulnerable.Check Version:
get system statusVerify Fix Applied:
After updating, verify the version shows 5.8.1 or later. Test authentication by attempting to log in with incorrect credentials - this should fail.📡 Detection & Monitoring
Log Indicators:
- Successful login events without proper authentication
- Multiple failed login attempts followed by successful access
- Configuration changes from unexpected IP addresses
Network Indicators:
- HTTP/HTTPS traffic to FortiWebManager administrative interface from unexpected sources
- Unusual patterns of administrative access
SIEM Query:
source="fortiwebmanager" AND (event_type="login" AND result="success") AND NOT (user="admin" OR user="administrator")