CVE-2021-43319

Q: What is the severity of CVE-2021-43319?

CVE-2021-43319 has a CVSS score of 9.8 (CRITICAL). This vulnerability allows remote attackers to execute arbitrary commands on Zoho ManageEngine Network Configuration Manager servers due to improper input validation in the Ping functionality. Attackers can inject malicious commands that get executed with system privileges. All organizations running vulnerable versions of this network management software are affected.

9.8 CRITICAL

Remote Code Execution

📋 TL;DR

This vulnerability allows remote attackers to execute arbitrary commands on Zoho ManageEngine Network Configuration Manager servers due to improper input validation in the Ping functionality. Attackers can inject malicious commands that get executed with system privileges. All organizations running vulnerable versions of this network management software are affected.

💻 Affected Systems

Products:

Zoho ManageEngine Network Configuration Manager

Versions: All versions before 125488

Operating Systems: Windows, Linux

Default Config Vulnerable: ⚠️ Yes

Notes: The vulnerability exists in the Ping functionality which is typically enabled by default in network management software.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise allowing attackers to execute arbitrary commands with high privileges, potentially leading to data theft, lateral movement, ransomware deployment, or persistent backdoor installation.

🟠

Likely Case

Remote code execution leading to unauthorized access, data exfiltration, or deployment of additional malware on the affected system.

🟢

If Mitigated

Limited impact if proper network segmentation, least privilege principles, and input validation are implemented, though the vulnerability still presents significant risk.

🌐 Internet-Facing: HIGH - The vulnerability can be exploited remotely without authentication, making internet-facing instances extremely vulnerable to attack.

🏢 Internal Only: HIGH - Even internally, this vulnerability allows attackers with network access to compromise the system and potentially move laterally within the network.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Command injection vulnerabilities are typically easy to exploit, and this CVE has a high CVSS score indicating low attack complexity.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 125488

Vendor Advisory: https://www.manageengine.com/network-configuration-manager/release-notes.html#125488

Restart Required: Yes

Instructions:

1. Download version 125488 or later from the ManageEngine website. 2. Backup your current installation. 3. Stop the ManageEngine Network Configuration Manager service. 4. Install the updated version. 5. Restart the service.

🔧 Temporary Workarounds

Disable Ping Functionality

all

Temporarily disable the vulnerable Ping functionality if it's not critical for operations

Network Access Control

all

Restrict network access to the ManageEngine instance using firewall rules

🧯 If You Can't Patch

Implement strict network segmentation to isolate the vulnerable system from critical assets
Deploy web application firewall (WAF) rules to block command injection patterns

🔍 How to Verify

Check if Vulnerable:

Check the installed version of ManageEngine Network Configuration Manager and compare against vulnerable versions (before 125488)

Check Version:

Check the version in the web interface under Help > About, or examine the installation directory for version files

Verify Fix Applied:

Verify the installed version is 125488 or later and test the Ping functionality with various inputs

📡 Detection & Monitoring

Log Indicators:

Unusual command execution in system logs
Multiple failed ping attempts with unusual parameters
System process creation from the ManageEngine service

Network Indicators:

Unusual outbound connections from the ManageEngine server
Traffic patterns suggesting command and control activity

SIEM Query:

source="manageengine" AND (process_execution OR command_injection OR unusual_parameters)

📊 Metadata

CVE ID: CVE-2021-43319

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-77

Published: November 30, 2021

Last Updated: November 21, 2024

🔗 References

https://manageengine.com Product
https://www.manageengine.com/network-configuration-manager/release-notes.html#125488 Release Notes,Vendor Advisory
https://manageengine.com Product
https://www.manageengine.com/network-configuration-manager/release-notes.html#125488 Release Notes,Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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Manageengine Network Configuration Manager by Zohocorp

Manageengine Network Configuration Manager by Zohocorp

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