CVE-2017-7925
📋 TL;DR
This vulnerability allows attackers to extract passwords from configuration files on Dahua security devices. Attackers can use these credentials to impersonate privileged users and access sensitive information. Affected systems include multiple Dahua IP cameras, NVRs, and hybrid video recorders.
💻 Affected Systems
- DH-IPC-HDBW23A0RN-ZS
- DH-IPC-HDBW13A0SN
- DH-IPC-HDW1XXX
- DH-IPC-HDW2XXX
- DH-IPC-HDW4XXX
- DH-IPC-HFW1XXX
- DH-IPC-HFW2XXX
- DH-IPC-HFW4XXX
- DH-SD6CXX
- DH-NVR1XXX
- DH-HCVR4XXX
- DH-HCVR5XXX
- DHI-HCVR51A04HE-S3
- DHI-HCVR51A08HE-S3
- DHI-HCVR58A32S-S2
📦 What is this software?
Dh Hcvr4xxx Firmware by Dahuasecurity
Dh Hcvr5xxx Firmware by Dahuasecurity
Dh Ipc Hdbw23a0rn Zs Firmware by Dahuasecurity
Dh Ipc Hdw1xxx Firmware by Dahuasecurity
Dh Ipc Hdw2xxx Firmware by Dahuasecurity
Dh Ipc Hdw4xxx Firmware by Dahuasecurity
Dh Ipc Hfw1xxx Firmware by Dahuasecurity
Dh Ipc Hfw2xxx Firmware by Dahuasecurity
Dh Ipc Hfw4xxx Firmware by Dahuasecurity
Dh Nvr1xxx Firmware by Dahuasecurity
Dh Sd6cxx Firmware by Dahuasecurity
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of security system with unauthorized access to video feeds, configuration changes, and potential lateral movement to other network systems.
Likely Case
Unauthorized access to video surveillance feeds, configuration tampering, and potential data exfiltration.
If Mitigated
Limited impact if devices are isolated in secure networks with proper access controls and monitoring.
🎯 Exploit Status
Exploitation requires accessing configuration files which may be accessible via web interface or file system access. No authentication needed to access vulnerable files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates released March 2017
Vendor Advisory: http://us.dahuasecurity.com/en/us/Security-Bulletin_030617.php
Restart Required: Yes
Instructions:
1. Download latest firmware from Dahua support portal. 2. Backup current configuration. 3. Upload firmware via web interface. 4. Reboot device. 5. Restore configuration if needed. 6. Change all passwords.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices in separate VLAN with strict firewall rules
Access Control
linuxRestrict web interface access to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate devices in separate network segment with no internet access
- Implement strict firewall rules to block all inbound access except from management stations
🔍 How to Verify
Check if Vulnerable:
Check if configuration files contain plaintext or weakly encrypted passwords. Access device web interface and inspect configuration backup files.Check Version:
Check web interface System Information page or use SNMP query to deviceVerify Fix Applied:
Verify firmware version is March 2017 or later. Check that configuration files no longer contain vulnerable password storage.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login
- Configuration file access from unusual IP addresses
- Password change events
Network Indicators:
- Unusual traffic patterns to/from Dahua devices
- Configuration file downloads from unauthorized sources
- Access from unexpected geographic locations
SIEM Query:
sourceIP="Dahua_device_IP" AND (eventType="config_access" OR eventType="file_download")🔗 References
- http://us.dahuasecurity.com/en/us/Security-Bulletin_030617.php
- http://www.securityfocus.com/bid/98312
- https://ics-cert.us-cert.gov/advisories/ICSA-17-124-02
- http://us.dahuasecurity.com/en/us/Security-Bulletin_030617.php
- http://www.securityfocus.com/bid/98312
- https://ics-cert.us-cert.gov/advisories/ICSA-17-124-02
