CVE-2019-6649
📋 TL;DR
This vulnerability in F5 BIG-IP and Enterprise Manager exposes sensitive information and allows system configuration modification when using non-default ConfigSync settings. Attackers can potentially access credentials and modify device configurations. Affected users are those running vulnerable versions with non-default ConfigSync configurations.
💻 Affected Systems
- F5 BIG-IP
- F5 Enterprise Manager
📦 What is this software?
Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
View all CVEs affecting Big Ip Application Acceleration Manager →
Big Ip Application Acceleration Manager by F5
View all CVEs affecting Big Ip Application Acceleration Manager →
Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
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Big Ip Application Security Manager by F5
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Big Ip Application Security Manager by F5
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⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to steal credentials, modify configurations, intercept traffic, and potentially pivot to other network segments.
Likely Case
Unauthorized access to sensitive configuration data and credentials, leading to potential privilege escalation and network reconnaissance.
If Mitigated
Limited exposure if using default ConfigSync settings or proper network segmentation, though risk remains for misconfigured systems.
🎯 Exploit Status
Exploitation requires knowledge of non-default ConfigSync configurations and network access to affected systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: BIG-IP: 15.0.1, 14.1.0.7, 14.0.0.6, 13.1.2, 12.1.5, 11.6.5, 11.5.10; Enterprise Manager: 3.1.2
Vendor Advisory: https://support.f5.com/csp/article/K05123525
Restart Required: Yes
Instructions:
1. Download appropriate patch from F5 Downloads. 2. Backup current configuration. 3. Apply patch following F5 upgrade procedures. 4. Restart affected services. 5. Verify patch installation and functionality.
🔧 Temporary Workarounds
Revert to Default ConfigSync
allChange ConfigSync settings back to default configuration to eliminate vulnerability
tmsh modify /cm device-group <device-group-name> configsync-ip none
Restrict Network Access
allLimit network access to ConfigSync ports (4353/tcp) to trusted management networks only
tmsh create /net route <route-name> network <trusted-network> gateway <gateway-ip>
🧯 If You Can't Patch
- Implement strict network segmentation to isolate BIG-IP management interfaces
- Monitor ConfigSync traffic and configuration changes for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check BIG-IP version with 'tmsh show sys version' and verify if using non-default ConfigSync settings with 'tmsh list /cm device-group'Check Version:
tmsh show sys versionVerify Fix Applied:
Verify version is patched with 'tmsh show sys version' and check ConfigSync settings are either default or properly secured📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to ConfigSync services
- Unexpected configuration changes in BIG-IP logs
- Authentication failures on management interfaces
Network Indicators:
- Unusual traffic on port 4353/tcp from untrusted sources
- ConfigSync traffic to/from unexpected IP addresses
SIEM Query:
source="bigip_logs" AND (port=4353 OR "ConfigSync") AND (src_ip NOT IN trusted_networks)