CVE-2018-20145 : What You Need to Know
Learn about CVE-2018-20145, an ACL bypass vulnerability in Eclipse Mosquitto versions 1.5.x before 1.5.5. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
An ACL bypass vulnerability was discovered in Eclipse Mosquitto versions 1.5.x prior to 1.5.5. The issue occurred when the per_listener_settings option was enabled, and the default listener was being used with an acl_file specified, resulting in the acl file being disregarded.
Understanding CVE-2018-20145
This CVE entry describes a security vulnerability in Eclipse Mosquitto versions 1.5.x before 1.5.5 that could allow an ACL bypass under specific conditions.
What is CVE-2018-20145?
CVE-2018-20145 is an ACL bypass vulnerability in Eclipse Mosquitto versions 1.5.x prior to 1.5.5. It arises when certain listener settings are configured, leading to the disregard of ACL files.
The Impact of CVE-2018-20145
The vulnerability could potentially allow unauthorized access to resources protected by ACLs, compromising the security of the affected systems.
Technical Details of CVE-2018-20145
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The issue in Eclipse Mosquitto 1.5.x before 1.5.5 allows an ACL bypass when specific listener settings are in use, resulting in the ignoring of ACL files.
Affected Systems and Versions
- Product: Eclipse Mosquitto
- Vendor: N/A
- Versions affected: 1.5.x prior to 1.5.5
Exploitation Mechanism
The vulnerability occurs when the per_listener_settings option is enabled, and the default listener is utilized with an acl_file specified, leading to the ACL file being ignored.
Mitigation and Prevention
To address and prevent the exploitation of CVE-2018-20145, the following steps are recommended:
Immediate Steps to Take
- Disable the per_listener_settings option if not explicitly required.
- Ensure that ACL files are correctly enforced and not bypassed.
Long-Term Security Practices
- Regularly update Eclipse Mosquitto to the latest version to patch known vulnerabilities.
- Implement network segmentation and access controls to limit exposure to potential threats.
Patching and Updates
- Apply the necessary patches provided by Eclipse Mosquitto to fix the ACL bypass vulnerability.