CVE-2017-7279
📋 TL;DR
CVE-2017-7279 is a privilege escalation vulnerability in Unitrends Enterprise Backup web server where an unprivileged authenticated user can modify their authentication token cookie to gain root privileges. This affects all versions before 9.0.0. The vulnerability allows complete system compromise through remote code execution.
💻 Affected Systems
- Unitrends Enterprise Backup
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root access, allowing data theft, destruction, lateral movement, and persistent backdoor installation.
Likely Case
Attackers gain root privileges on the backup server, potentially accessing all backup data, modifying backups, and using the server as a pivot point.
If Mitigated
With proper network segmentation and least privilege, impact limited to backup system compromise but still significant due to sensitive data exposure.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated. Public exploit details available in security research publications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.0.0 and later
Vendor Advisory: https://support.unitrends.com/UnitrendsBackup/s/article/000005755
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download and install Unitrends Enterprise Backup version 9.0.0 or later from official vendor portal. 3. Follow vendor upgrade documentation. 4. Restart services as required.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict access to the Unitrends web interface to trusted administrative networks only.
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
User Account Review
allReview and remove unnecessary user accounts with web interface access.
🧯 If You Can't Patch
- Isolate the Unitrends appliance on a dedicated VLAN with strict firewall rules allowing only necessary backup traffic.
- Implement multi-factor authentication for all administrative accounts and regularly audit user access logs.
🔍 How to Verify
Check if Vulnerable:
Check the Unitrends version via web interface or CLI. If version is below 9.0.0, the system is vulnerable.Check Version:
cat /usr/bp/appliance_version.txtVerify Fix Applied:
Verify version is 9.0.0 or higher and test that token modification no longer grants elevated privileges.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts in web server logs
- Multiple failed login attempts followed by successful login with token manipulation patterns
Network Indicators:
- Unusual outbound connections from backup server
- Unexpected SSH/RDP connections originating from backup appliance
SIEM Query:
source="unitrends_web.log" AND (event="privilege_escalation" OR event="token_modification")