CVE-2019-14656 Explained : Impact and Mitigation

Yealink phones have a vulnerability where the default User account can perform admin requests via HTTP due to inadequate user role verification in POST requests.

Understanding CVE-2019-14656

Yealink phones released until August 4th, 2019, are susceptible to a security flaw that allows unauthorized admin requests.

What is CVE-2019-14656?

The vulnerability in Yealink phones enables the default User account, with the password 'user,' to execute admin requests over HTTP by bypassing proper user role verification in POST requests.

The Impact of CVE-2019-14656

This vulnerability poses a significant security risk as it allows unauthorized users to gain admin privileges on Yealink phones, potentially leading to unauthorized access and control.

Technical Details of CVE-2019-14656

Yealink phones' security flaw is detailed below:

Vulnerability Description

Yealink phones lack proper user role verification in POST requests
Default User account with password 'user' can initiate admin requests via HTTP

Affected Systems and Versions

Product: Yealink phones
Vendor: Yealink
Versions: All versions until August 4th, 2019

Exploitation Mechanism

Unauthorized users exploit the vulnerability by using the default User account credentials to perform admin actions over HTTP

Mitigation and Prevention

To address CVE-2019-14656, follow these steps:

Immediate Steps to Take

Change the default password for the User account on Yealink phones
Implement network segmentation to restrict access to vulnerable devices

Long-Term Security Practices

Regularly update firmware and security patches on Yealink phones
Conduct security training for users to promote strong password practices

Patching and Updates

Yealink may release patches or updates to fix the vulnerability, ensure to apply them promptly