CVE-2018-12227 : Vulnerability Insights and Analysis

A vulnerability was found in Asterisk Open Source versions 13.x, 14.x, and 15.x, as well as in Certified Asterisk versions 13.18-cert and 13.21-cert. The issue allows disclosure of requests targeting defined endpoints.

Understanding CVE-2018-12227

This CVE involves a vulnerability in Asterisk Open Source and Certified Asterisk versions that could expose specific endpoints targeted by SIP requests.

What is CVE-2018-12227?

The vulnerability in Asterisk Open Source and Certified Asterisk versions allows unauthorized disclosure of requests aimed at defined endpoints when specific ACL rules block SIP requests.

The Impact of CVE-2018-12227

The vulnerability could potentially expose sensitive information and compromise the security of the affected systems.

Technical Details of CVE-2018-12227

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The issue arises when ACL rules associated with endpoints block SIP requests, leading to the disclosure of requests targeting defined endpoints.

Affected Systems and Versions

Asterisk Open Source versions 13.x, 14.x, and 15.x before specified versions
Certified Asterisk versions 13.18-cert and 13.21-cert before specified versions

Exploitation Mechanism

When specific ACL rules block a SIP request, a 403 forbidden response is generated
If an endpoint is not identified, a 401 unauthorized response is sent instead

Mitigation and Prevention

To address and prevent the CVE-2018-12227 vulnerability, follow these steps:

Immediate Steps to Take

Update Asterisk Open Source and Certified Asterisk to the patched versions
Review and adjust ACL rules to enhance security

Long-Term Security Practices

Regularly monitor and audit SIP requests and responses
Implement network segmentation to limit exposure

Patching and Updates

Apply the necessary patches provided by Asterisk to fix the vulnerability