CVE-2019-18830 – CVE-2019-18830 is a critical OS command injecti... (How to Fix)

Q: What is the severity of CVE-2019-18830?

CVE-2019-18830 has a CVSS score of 9.8 (CRITICAL). CVE-2019-18830 is a critical OS command injection vulnerability in Barco ClickShare Button devices that allows attackers to execute arbitrary commands with 'nobody' user privileges. This affects ClickShare Button R9861500D01 devices running firmware versions before 1.9.0. Organizations using these wireless presentation systems are vulnerable to remote code execution attacks.

📋 TL;DR

CVE-2019-18830 is a critical OS command injection vulnerability in Barco ClickShare Button devices that allows attackers to execute arbitrary commands with 'nobody' user privileges. This affects ClickShare Button R9861500D01 devices running firmware versions before 1.9.0. Organizations using these wireless presentation systems are vulnerable to remote code execution attacks.

💻 Affected Systems

Products:

Barco ClickShare Button R9861500D01

Versions: All firmware versions before 1.9.0

Operating Systems: Embedded Linux-based system

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in the 'dongle_bridge' program that exposes ClickShare Button functionality via USB. All default configurations are vulnerable.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full device compromise leading to persistent backdoor installation, lateral movement to connected networks, and potential data exfiltration from presentations.

🟠

Likely Case

Unauthenticated remote code execution allowing attackers to disrupt presentations, steal sensitive presentation data, or use the device as a foothold into corporate networks.

🟢

If Mitigated

Limited impact if devices are isolated on separate VLANs with strict network segmentation and regular firmware updates.

🌐 Internet-Facing: HIGH - Devices exposed to internet are directly exploitable without authentication.

🏢 Internal Only: HIGH - Even internally, devices are vulnerable to network-adjacent attackers without authentication requirements.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

F-Secure published detailed advisory with exploitation details. The vulnerability requires network access but no authentication, making exploitation straightforward.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.9.0 and later

Vendor Advisory: https://www.barco.com/en/clickshare/firmware-update

Restart Required: Yes

Instructions:

1. Download firmware version 1.9.0 or later from Barco support site. 2. Connect to ClickShare Button web interface. 3. Navigate to Settings > System > Update. 4. Upload the firmware file and follow on-screen instructions. 5. Device will reboot automatically after update.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate ClickShare devices on separate VLAN with strict firewall rules limiting communication to presentation sources only.

Disable Unused Features

all

Disable USB bridging functionality if not required for your use case.

🧯 If You Can't Patch

Physically disconnect devices from network when not in active use for presentations.
Implement strict network access controls allowing only trusted presentation sources to communicate with devices.

🔍 How to Verify

Check if Vulnerable:

Check firmware version via web interface: Settings > System > Information. If version is below 1.9.0, device is vulnerable.

Check Version:

Connect to device web interface and navigate to Settings > System > Information page.

Verify Fix Applied:

After updating, verify firmware version shows 1.9.0 or higher in Settings > System > Information.

📡 Detection & Monitoring

Log Indicators:

Unusual process execution from dongle_bridge
Unexpected command execution attempts
Abnormal network connections from ClickShare device

Network Indicators:

Suspicious outbound connections from ClickShare device
Unexpected protocol usage on device ports
Anomalous traffic patterns to/from presentation systems

SIEM Query:

source="clickshare" AND (process="dongle_bridge" OR command="*;*" OR command="*|*")

📊 Metadata

CVE ID: CVE-2019-18830

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-78

Published: December 16, 2019

Last Updated: November 21, 2024

🔗 References

https://labs.f-secure.com/advisories/multiple-vulnerabilities-in-barco-clickshare/ Third Party Advisory
https://www.barco.com/en/clickshare/firmware-update Product
https://www.barco.com/en/support/software/R33050069?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050070?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050095?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050125?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://labs.f-secure.com/advisories/multiple-vulnerabilities-in-barco-clickshare/ Third Party Advisory
https://www.barco.com/en/clickshare/firmware-update Product
https://www.barco.com/en/support/software/R33050069?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050070?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050095?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory
https://www.barco.com/en/support/software/R33050125?majorVersion=01&minorVersion=09&patchVersion=01&buildVersion=007 Product,Vendor Advisory

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