CVE-2021-37748 : Security Advisory and Response

Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote authenticated users to execute arbitrary code as root via a crafted manage_if setting, thus bypassing the intended restrictions of this shell and taking full control of the device. There are default weak credentials that can be used to authenticate.

Understanding CVE-2021-37748

This CVE involves multiple buffer overflows in the configuration shell of Grandstream HT801 devices, enabling remote authenticated users to execute arbitrary code as root.

What is CVE-2021-37748?

The vulnerability in Grandstream HT801 devices allows attackers to bypass restrictions and gain complete control by exploiting buffer overflows in the configuration shell.

The Impact of CVE-2021-37748

By leveraging this vulnerability, remote authenticated users can execute malicious code as root, compromising the device's security and integrity.

Technical Details of CVE-2021-37748

This section provides insights into the vulnerability's description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The flaw in Grandstream HT801 devices enables attackers to execute arbitrary code with root privileges, achieved through crafted manage_if settings.

Affected Systems and Versions

Grandstream HT801 devices before version 1.0.29 are impacted by this vulnerability, exposing them to potential exploitation.

Exploitation Mechanism

Attackers can exploit this CVE by utilizing default weak credentials to authenticate and execute arbitrary code, gaining unauthorized access.

Mitigation and Prevention

To secure systems from CVE-2021-37748, immediate actions, long-term security practices, and patching procedures are essential.

Immediate Steps to Take

Users should update Grandstream HT801 devices to version 1.0.29 or apply patches provided by the vendor to mitigate the risk of exploitation.

Long-Term Security Practices

Implementing strong password policies, restricting network access, and regularly monitoring for unusual activities can enhance overall security posture.

Patching and Updates

Stay vigilant for security advisories and promptly apply patches released by Grandstream to address vulnerabilities and reinforce device security.