CVE-2018-6289
📋 TL;DR
CVE-2018-6289 is a configuration file injection vulnerability in Kaspersky Secure Mail Gateway that allows attackers to execute arbitrary code with root privileges. This affects version 1.1 of the product, enabling complete system compromise. Organizations using this specific version are vulnerable to remote code execution.
💻 Affected Systems
- Kaspersky Secure Mail Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root privileges, allowing installation of persistent backdoors, data exfiltration, and lateral movement within the network.
Likely Case
Remote code execution leading to mail gateway compromise, potential email interception, and credential theft from the affected system.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation, though internal threats remain possible.
🎯 Exploit Status
Exploitation details were publicly disclosed in security advisories, making weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.1.162.0 or later
Vendor Advisory: https://support.kaspersky.com/vulnerability.aspx?el=12430#010218
Restart Required: Yes
Instructions:
1. Download the latest patch from Kaspersky support portal. 2. Apply the update through the appliance management interface. 3. Restart the appliance as prompted.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the mail gateway from untrusted networks to reduce attack surface.
Access Control Restrictions
linuxLimit administrative access to the appliance to trusted IP addresses only.
iptables -A INPUT -p tcp --dport [admin_port] -s [trusted_ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [admin_port] -j DROP
🧯 If You Can't Patch
- Decommission the vulnerable version and replace with a supported, patched version or alternative solution.
- Implement strict network monitoring and intrusion detection specifically for this appliance.
🔍 How to Verify
Check if Vulnerable:
Check the appliance version in the web administration interface under System Information.Check Version:
ssh admin@[appliance_ip] 'cat /etc/version' or check via web interfaceVerify Fix Applied:
Verify the version is 1.1.162.0 or higher in the administration interface.📡 Detection & Monitoring
Log Indicators:
- Unusual configuration file modifications
- Unexpected root-level process execution
- Failed authentication attempts to admin interface
Network Indicators:
- Suspicious traffic to admin ports from untrusted sources
- Unexpected outbound connections from the appliance
SIEM Query:
source="kaspersky_mail_gateway" AND (event="config_modification" OR event="root_execution")🔗 References
- https://support.kaspersky.com/vulnerability.aspx?el=12430#010218
- https://www.coresecurity.com/advisories/kaspersky-secure-mail-gateway-multiple-vulnerabilities
- https://support.kaspersky.com/vulnerability.aspx?el=12430#010218
- https://www.coresecurity.com/advisories/kaspersky-secure-mail-gateway-multiple-vulnerabilities
