CVE-2022-42478
📋 TL;DR
CVE-2022-42478 is an authentication brute force vulnerability in FortiSIEM that allows non-privileged users to perform unlimited authentication attempts against multiple endpoints. This affects FortiSIEM versions below 7.0.0, potentially allowing attackers to guess credentials and gain unauthorized access.
💻 Affected Systems
- FortiSIEM
📦 What is this software?
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
Fortisiem by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Attackers could brute force administrative credentials, gain full system control, and potentially pivot to other systems in the network.
Likely Case
Attackers gain unauthorized access to FortiSIEM with user-level privileges, allowing them to view sensitive security data and modify configurations.
If Mitigated
With proper rate limiting and monitoring, only limited account lockouts or failed login alerts would occur.
🎯 Exploit Status
Exploitation requires access to specific endpoints but uses simple brute force techniques. No authentication bypass needed, just lack of rate limiting.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiSIEM 7.0.0 and above
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-22-258
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Upgrade FortiSIEM to version 7.0.0 or later. 3. Restart the system. 4. Verify authentication rate limiting is enabled.
🔧 Temporary Workarounds
Implement Network Access Controls
allRestrict access to FortiSIEM management interfaces to trusted IP addresses only.
Enable Account Lockout Policies
allConfigure account lockout after failed authentication attempts if supported by your version.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiSIEM from untrusted networks
- Enable comprehensive logging and monitoring for authentication attempts with alerting on brute force patterns
🔍 How to Verify
Check if Vulnerable:
Check FortiSIEM version via GUI (System > Status) or CLI. If version is below 7.0.0, system is vulnerable.Check Version:
ssh admin@fortisiem-host 'show version' or check via web interfaceVerify Fix Applied:
After upgrade, verify version is 7.0.0 or higher and test authentication rate limiting by attempting multiple failed logins.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from same source IP
- Unusual authentication patterns to FortiSIEM endpoints
Network Indicators:
- High volume of authentication requests to FortiSIEM management ports
- Traffic patterns suggesting credential guessing
SIEM Query:
source="fortisiem" AND (event_type="authentication_failure" OR event_type="login_failed") | stats count by src_ip, user | where count > 10