CVE-2021-27328 : Security Advisory and Response

Yeastar NeoGate TG400 91.3.0.3 devices are affected by a Directory Traversal vulnerability that allows an authenticated user to decrypt firmware and access sensitive information such as passwords and decryption keys.

Understanding CVE-2021-27328

This CVE relates to a security issue in Yeastar NeoGate TG400 devices that could be exploited by authenticated users to gain unauthorized access to sensitive data.

What is CVE-2021-27328?

CVE-2021-27328 is a vulnerability in Yeastar NeoGate TG400 91.3.0.3 devices that enables a user with the appropriate privileges to decrypt firmware and extract sensitive information.

The Impact of CVE-2021-27328

The impact of this vulnerability is significant as it allows attackers to access confidential data stored on the affected devices, compromising the security and integrity of the system.

Technical Details of CVE-2021-27328

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

Vulnerability Description

The vulnerability in Yeastar NeoGate TG400 91.3.0.3 devices allows authenticated users to perform directory traversal, thereby decrypting firmware and accessing sensitive information like passwords and decryption keys.

Affected Systems and Versions

The vulnerability affects Yeastar NeoGate TG400 devices running version 91.3.0.3.

Exploitation Mechanism

To exploit CVE-2021-27328, an authenticated user can manipulate directory traversal to decrypt firmware and retrieve confidential data stored on the affected devices.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate action and the implementation of long-term security practices.

Immediate Steps to Take

Update Yeastar NeoGate TG400 devices to a patched version that addresses the directory traversal vulnerability.
Monitor user activities and access to prevent unauthorized decryption of firmware.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent security vulnerabilities.
Implement strict authentication mechanisms to control user access and prevent unauthorized decryption attempts.

Patching and Updates

Stay informed about security advisories from Yeastar and apply patches promptly to secure devices against potential threats.