CVE-2020-5242 : Vulnerability Insights and Analysis

openHAB before 2.5.2 allows a remote attacker to execute arbitrary commands on the system. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2020-5242

openHAB exec add-ons allow remote arbitrary command execution.

What is CVE-2020-5242?

openHAB versions prior to 2.5.2 are vulnerable to remote attackers using REST calls to install the EXEC binding or transformation service, enabling them to run arbitrary commands with the user's privileges.

The Impact of CVE-2020-5242

CVSS Base Score: 7.7 (High)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Privileges Required: Low
User Interaction: Required
Scope: Changed
Attack Complexity: High
Availability Impact: None

Technical Details of CVE-2020-5242

Vulnerability Description

The vulnerability allows remote attackers to execute arbitrary commands on the system.

Affected Systems and Versions

Product: openhab-addons
Vendor: openhab
Versions Affected: < 2.5.2

Exploitation Mechanism

Attackers can exploit this vulnerability through REST calls to install the EXEC binding or transformation service.

Mitigation and Prevention

Immediate Steps to Take

Upgrade openHAB to version 2.5.2 or newer.
Whitelist all commands in a local file that cannot be altered via REST calls.

Long-Term Security Practices

Regularly update and patch openHAB to the latest version.
Implement network segmentation and access controls.
Monitor and log REST API calls for suspicious activities.

Patching and Updates

Ensure all systems running openHAB are updated to version 2.5.2 or above to mitigate the vulnerability.