CVE-2023-1778
📋 TL;DR
This vulnerability allows remote attackers to gain superuser access to GajShield Data Security Firewall devices using default credentials. Attackers can execute arbitrary commands with administrative privileges via web interface or SSH. All systems running vulnerable firmware versions without password changes are affected.
💻 Affected Systems
- GajShield Data Security Firewall
📦 What is this software?
Data Security Firewall Firmware by Gajshield
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to reconfigure firewall rules, intercept network traffic, install persistent backdoors, and pivot to internal networks.
Likely Case
Unauthorized administrative access leading to network configuration changes, data exfiltration, and use as attack launch point.
If Mitigated
No impact if default credentials were changed or devices are not internet-facing with proper access controls.
🎯 Exploit Status
Exploitation requires only knowledge of default credentials and network access to management interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.28
Vendor Advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2023-0119
Restart Required: Yes
Instructions:
1. Download firmware v4.28 from GajShield support portal. 2. Backup current configuration. 3. Upload and install firmware update via web interface. 4. Reboot device. 5. Verify new firmware version and change all passwords.
🔧 Temporary Workarounds
Change Default Credentials
allImmediately change all default passwords to strong, unique credentials
Restrict Management Access
allLimit access to management interfaces to trusted IP addresses only
🧯 If You Can't Patch
- Immediately change all default passwords to complex, unique credentials
- Restrict management interface access to specific trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > About) or SSH login with default credentialsCheck Version:
ssh admin@firewall_ip 'show version' or check web interface System > AboutVerify Fix Applied:
Verify firmware version is v4.28 or later and password change is enforced📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login with default credentials
- Configuration changes from unknown IP addresses
- SSH connections from unexpected sources
Network Indicators:
- Unusual outbound connections from firewall device
- Management interface access from non-approved IPs
- SSH brute force attempts
SIEM Query:
source="firewall_logs" (event_type="login_success" AND user="admin") OR (event_type="config_change" AND source_ip NOT IN allowed_ips)