CVE-2018-17563 : Security Advisory and Response

Grandstream GXP16xx VoIP phones with version 1.0.4.128 are vulnerable to an exploit that allows attackers to extract device configurations in plain text.

Understanding CVE-2018-17563

This CVE involves a flaw in the /cgi-bin/api-get_line_status endpoint of Grandstream GXP16xx VoIP phones.

What is CVE-2018-17563?

Attackers can exploit a vulnerability in Grandstream GXP16xx VoIP phones to retrieve device configurations in plain text by providing a malformed input string.

The Impact of CVE-2018-17563

This vulnerability enables threat actors to access sensitive device configurations, potentially leading to unauthorized access and data exposure.

Technical Details of CVE-2018-17563

Grandstream GXP16xx VoIP phones with version 1.0.4.128 are susceptible to the following:

Vulnerability Description

Attackers can exploit the /cgi-bin/api-get_line_status endpoint with a malformed input string to extract device configurations.

Affected Systems and Versions

Product: Grandstream GXP16xx VoIP phones
Vendor: Grandstream
Version: 1.0.4.128

Exploitation Mechanism

By providing a specially crafted input string to the /cgi-bin/api-get_line_status endpoint, attackers can retrieve device configurations in plain text.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of CVE-2018-17563:

Immediate Steps to Take

Update the firmware of Grandstream GXP16xx VoIP phones to a secure version.
Implement strong access controls and authentication mechanisms.

Long-Term Security Practices

Regularly monitor and audit device configurations for any unauthorized changes.
Conduct security training for users to recognize and report suspicious activities.

Patching and Updates

Stay informed about security advisories from Grandstream and apply patches promptly to mitigate known vulnerabilities.