CVE-2016-1984
📋 TL;DR
This vulnerability involves a hardcoded backdoor account '1MB@tMaN' with a static password in Harman AMX devices, allowing remote attackers to gain unauthorized access via SSH or HTTP. It affects AMX devices running firmware versions before January 20, 2016. This is a critical authentication bypass vulnerability.
💻 Affected Systems
- Harman AMX devices (various models)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the AMX device allowing attackers to execute arbitrary commands, modify configurations, disrupt operations, and potentially pivot to other network systems.
Likely Case
Unauthorized access to the device leading to configuration changes, service disruption, and potential data exfiltration from connected systems.
If Mitigated
Limited impact if network segmentation prevents access to AMX devices and strong authentication controls are in place for management interfaces.
🎯 Exploit Status
Exploitation is trivial - attackers simply need to connect via SSH or HTTP using the hardcoded credentials. Public exploit scripts and detailed documentation exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware versions from 2016-01-20 onward
Vendor Advisory: http://www.amx.com/techcenter/NXSecurityBrief/
Restart Required: Yes
Instructions:
1. Download the latest firmware from AMX Tech Center. 2. Backup current configuration. 3. Apply firmware update following vendor instructions. 4. Verify the update removed the backdoor account.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to AMX devices using firewall rules to only allow connections from authorized management systems.
Account Monitoring
linuxMonitor authentication logs for attempts to use the '1MB@tMaN' account and block offending IP addresses.
grep -i '1MB@tMaN' /var/log/auth.log
grep -i '1MB@tMaN' /var/log/secure
🧯 If You Can't Patch
- Isolate AMX devices in a separate VLAN with strict firewall rules allowing only necessary traffic
- Implement network monitoring to detect authentication attempts using the backdoor credentials
🔍 How to Verify
Check if Vulnerable:
Attempt SSH login with username '1MB@tMaN' and password '1MB@tMaN' (or check if account exists in /etc/passwd)Check Version:
Check device web interface or use SSH command specific to AMX device firmware versionVerify Fix Applied:
Verify firmware version is 2016-01-20 or later and confirm SSH login with backdoor credentials fails📡 Detection & Monitoring
Log Indicators:
- SSH authentication attempts for user '1MB@tMaN'
- HTTP requests with backdoor credentials in authentication headers
Network Indicators:
- SSH connections to AMX devices from unexpected sources
- HTTP authentication attempts to AMX web interfaces
SIEM Query:
source="auth.log" AND (user="1MB@tMaN" OR user="1MB@tMAN") OR destination_ip="AMX_DEVICE_IP" AND protocol="ssh" AND auth_failure🔗 References
- http://blog.sec-consult.com/2016/01/deliberately-hidden-backdoor-account-in.html
- http://seclists.org/fulldisclosure/2016/Jan/63
- http://www.amx.com/techcenter/NXSecurityBrief/
- http://www.amx.com/techcenter/firmware.asp?Category=Hot%20Fix%20Files
- https://ics-cert.us-cert.gov/advisories/ICSA-16-049-02
- https://www.kb.cert.org/vuls/id/992624
- https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20160121-0_AMX_Deliberately_hidden_backdoor_account_v10.txt
- http://blog.sec-consult.com/2016/01/deliberately-hidden-backdoor-account-in.html
- http://seclists.org/fulldisclosure/2016/Jan/63
- http://www.amx.com/techcenter/NXSecurityBrief/
- http://www.amx.com/techcenter/firmware.asp?Category=Hot%20Fix%20Files
- https://ics-cert.us-cert.gov/advisories/ICSA-16-049-02
- https://www.kb.cert.org/vuls/id/992624
- https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20160121-0_AMX_Deliberately_hidden_backdoor_account_v10.txt
