CVE-2016-7547
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Trend Micro Threat Discovery Appliance 2.6.1062r1 by exploiting improper input validation in the timezone parameter of the admin_sys_time.cgi interface. Attackers can gain full system control without authentication. Organizations using this specific appliance version are affected.
💻 Affected Systems
- Trend Micro Threat Discovery Appliance
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install persistent backdoors, exfiltrate sensitive data, pivot to internal networks, or disrupt security monitoring functions.
Likely Case
Initial foothold leading to lateral movement within the network, credential harvesting, and deployment of additional malware.
If Mitigated
Limited impact with proper network segmentation and monitoring, though system integrity would still be compromised.
🎯 Exploit Status
Metasploit module available since 2016. Exploitation requires only HTTP access to the vulnerable endpoint with crafted timezone parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 2.6.1062r1
Vendor Advisory: https://success.trendmicro.com/solution/1114911
Restart Required: Yes
Instructions:
1. Log into Trend Micro support portal. 2. Download latest firmware update. 3. Backup current configuration. 4. Apply firmware update via web interface. 5. Reboot appliance. 6. Verify update successful.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to the appliance web interface using firewall rules
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
Web Server Configuration
linuxDisable or restrict access to the vulnerable CGI endpoint
mv /path/to/admin_sys_time.cgi /path/to/admin_sys_time.cgi.disabled
🧯 If You Can't Patch
- Isolate appliance in dedicated VLAN with strict firewall rules allowing only necessary traffic
- Implement web application firewall (WAF) with command injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check appliance version via web interface or SSH: cat /etc/version | grep 2.6.1062r1Check Version:
cat /etc/versionVerify Fix Applied:
Verify version is updated: cat /etc/version | grep -v 2.6.1062r1📡 Detection & Monitoring
Log Indicators:
- Unusual timezone parameter values in web logs
- Multiple failed login attempts followed by successful admin_sys_time.cgi access
- Suspicious command execution in system logs
Network Indicators:
- HTTP POST requests to /cgi-bin/admin_sys_time.cgi with shell metacharacters in parameters
- Outbound connections from appliance to unexpected destinations
SIEM Query:
source="web_logs" AND uri="/cgi-bin/admin_sys_time.cgi" AND (param="timezone" AND value MATCHES "[;&|`$()]+")