SKYSEA Client View Remote Code Execution (RCE) Vulnerability (CVE-2016-7836) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTSKYSEA Client View Ver.11.221.03 and earlier
Remote attackers can bypass authentication to execute arbitrary system commands and gain full control over the target system
Apply the official vendor security patch immediately and restrict network access to the management console ports
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official security patch or upgrade to the latest supported version (Ver.11.300.08 or higher) provided by the vendor.
# Check the installed version of SKYSEA Client View via PowerShell
$Path = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
Get-ItemProperty -Path $Path | Where-Object { $_.DisplayName -like '*SKYSEA*' } | Select-Object DisplayName, DisplayVersion2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict access to the SKYSEA communication ports using host-based or network firewalls. Only allow connections from authorized management server IPs.
# Block all inbound traffic to the SKYSEA agent port except from a trusted Management Server IP (e.g., 192.168.1.100)
New-NetFirewallRule -DisplayName 'Allow_SKYSEA_Only_From_Admin' `
-Direction Inbound `
-Action Allow `
-Protocol TCP `
-LocalPort 50120 `
-RemoteAddress 192.168.1.100
New-NetFirewallRule -DisplayName 'Block_SKYSEA_Others' `
-Direction Inbound `
-Action Block `
-Protocol TCP `
-LocalPort 50120 `
-RemoteAddress Any3. Log Audit & IoC Verification Commands
Monitor active network connections to identify unauthorized external IP addresses attempting to connect to the SKYSEA agent ports.
# Check active connections on the SKYSEA agent port (e.g., 50120)
netstat -ano | findstr '50120'Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2016-7836) is a critical Remote Code Execution (RCE) flaw in 'SKYSEA Client View', an asset management and client monitoring software developed by Sky Co., Ltd. The root cause lies in an authentication bypass vulnerability (CWE-287) within the TCP communication protocol between the management console and the client agent. The agent fails to properly validate the authenticity of incoming connection requests on its listening ports.
2. Exploitation Mechanics & Attack Scenario
The SKYSEA Client View agent opens specific TCP ports (such as TCP 50120) to listen for commands from the management console. An attacker who has network access to these ports can craft and send malicious TCP packets that mimic legitimate management commands. Because the agent lacks robust authentication verification, it processes these unauthorized packets and executes the embedded arbitrary commands with SYSTEM or Administrator privileges.
3. Infrastructure & Business Impact
With a CVSS v3.1 score of 9.8 (Critical), this vulnerability is highly severe and is listed in the CISA KEV (Known Exploited Vulnerabilities) catalog due to active exploitation in the wild by threat actors. Successful exploitation allows attackers to compromise numerous endpoints and servers within an enterprise network, leading to data exfiltration, ransomware deployment, and lateral movement across the internal infrastructure.
Official Vendor Advisories & References
SKYSEA Client View Ver.11.221.03 and earlier allows remote code execution via a flaw in processing authentication on the TCP connection with the management console program.
Frequently Asked SecOps Questions (CVE-2016-7836)
FAQQ1. How critical is CVE-2016-7836 and is it actively exploited in the wild?
CVE-2016-7836 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 19.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2016-7836?
Primary impacted vendors include sky across skysea client view. Scope summary: SKYSEA Client View Ver.11.221.03 and all prior versions
Q3. What temporary mitigations or workarounds exist for CVE-2016-7836 before patching?
[Mitigation] Apply the official vendor security patch immediately and restrict network access to the management console ports Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2016-7836
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