CVE-2023-27521
📋 TL;DR
This CVE describes an OS command injection vulnerability in SolarView Compact mail settings that allows authenticated remote attackers to execute arbitrary commands on affected devices. The vulnerability affects SolarView Compact SV-CPT-MC310 and SV-CPT-MC310F versions before 8.10. Attackers with valid credentials can exploit this to gain full system control.
💻 Affected Systems
- SolarView Compact SV-CPT-MC310
- SolarView Compact SV-CPT-MC310F
📦 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 industrial control operations.
Likely Case
Attackers gain shell access to execute commands, potentially installing cryptocurrency miners, creating backdoors, or using the device as a pivot point for further attacks.
If Mitigated
With proper network segmentation and authentication controls, impact is limited to the isolated device with minimal data exposure.
🎯 Exploit Status
Exploitation requires authentication but is straightforward once credentials are obtained. Command injection vulnerabilities are commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 8.10
Vendor Advisory: https://www.contec.com/jp/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_solarview_230508.pdf
Restart Required: Yes
Instructions:
1. Download firmware version 8.10 from Contec's download site. 2. Backup current configuration. 3. Upload and apply the firmware update through the web interface. 4. Restart the device. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to the SolarView web interface 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
Authentication Hardening
allChange default credentials and implement strong password policies.
🧯 If You Can't Patch
- Isolate the device in a separate network segment with strict firewall rules
- Disable remote access to the mail settings page if not required
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the SolarView web interface under System Information. If version is below 8.10, the device is vulnerable.Check Version:
Check via web interface: System > System Information > Firmware VersionVerify Fix Applied:
After updating, verify the firmware version shows 8.10 or higher in the System Information page.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Multiple failed authentication attempts followed by successful login
- Suspicious processes spawned from web server context
Network Indicators:
- Unusual outbound connections from SolarView device
- Traffic to known malicious IPs or domains
- Unexpected SSH or reverse shell connections
SIEM Query:
source="solarview" AND (event="command_execution" OR event="shell_spawn" OR (auth_result="success" AND src_ip NOT IN [trusted_ips]))🔗 References
- https://jvn.jp/en/vu/JVNVU92106300/
- https://www.contec.com/jp/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_solarview_230508.pdf
- https://www.contec.com/jp/download/donwload-list/?itemid=b28c8b7c-9f40-40b2-843c-b5b04c035b0e#firmware
- https://jvn.jp/en/vu/JVNVU92106300/
- https://www.contec.com/jp/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_solarview_230508.pdf
- https://www.contec.com/jp/download/donwload-list/?itemid=b28c8b7c-9f40-40b2-843c-b5b04c035b0e#firmware
