CVE-2015-7261
📋 TL;DR
This vulnerability involves hardcoded FTP credentials in QNAP iArtist Lite and Signage Station software, allowing remote attackers to gain unauthorized access to affected systems via FTP sessions on port 21. Organizations using QNAP digital signage solutions with these specific software versions are affected.
💻 Affected Systems
- QNAP iArtist Lite
- QNAP Signage Station
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to upload malicious files, modify content, or use the system as a foothold for lateral movement within the network.
Likely Case
Unauthorized access to FTP service leading to content manipulation, data exfiltration, or installation of backdoors on affected signage systems.
If Mitigated
Limited impact if FTP service is disabled or network segmentation prevents external access to port 21.
🎯 Exploit Status
Exploitation requires only FTP client access with known hardcoded credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iArtist Lite 1.4.54+, Signage Station 2.0.1+
Vendor Advisory: http://www.kb.cert.org/vuls/id/444472
Restart Required: Yes
Instructions:
1. Log into QNAP App Center. 2. Check for updates to iArtist Lite or Signage Station. 3. Install version 1.4.54+ for iArtist Lite or 2.0.1+ for Signage Station. 4. Restart the application or device as required.
🔧 Temporary Workarounds
Disable FTP Service
allTurn off FTP service on affected QNAP devices to prevent exploitation.
Navigate to Control Panel > Network & File Services > FTP > Disable FTP service
Network Segmentation
allBlock external access to port 21/TCP on affected devices using firewall rules.
iptables -A INPUT -p tcp --dport 21 -j DROP
netsh advfirewall firewall add rule name="Block FTP" dir=in action=block protocol=TCP localport=21
🧯 If You Can't Patch
- Implement strict network access controls to limit FTP access to trusted IP addresses only.
- Monitor FTP logs for unauthorized access attempts and implement alerting for successful logins.
🔍 How to Verify
Check if Vulnerable:
Check installed version in QNAP App Center: iArtist Lite < 1.4.54 or Signage Station < 2.0.1 indicates vulnerability.Check Version:
Check via QNAP web interface: App Center > Installed AppsVerify Fix Applied:
Confirm version is iArtist Lite ≥ 1.4.54 or Signage Station ≥ 2.0.1 in App Center, then test FTP access with hardcoded credentials should fail.📡 Detection & Monitoring
Log Indicators:
- Successful FTP logins from unexpected IP addresses
- Multiple failed FTP login attempts followed by success
Network Indicators:
- Unexpected FTP connections to port 21
- FTP traffic patterns matching known hardcoded credential usage
SIEM Query:
source="ftp.log" AND (event="login successful" OR user="[hardcoded_username]")