CVE-2021-20843 : Security Advisory and Response

A detailed overview of CVE-2021-20843, a cross-site script inclusion vulnerability affecting Yamaha Corporation products.

Understanding CVE-2021-20843

This section provides insight into the nature of the vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-20843?

CVE-2021-20843 is a cross-site script inclusion vulnerability found in Yamaha Corporation products, specifically RTX830, NVR510, NVR700W, and RTX1210. It enables a remote authenticated attacker to modify product settings through a maliciously crafted web page.

The Impact of CVE-2021-20843

The vulnerability allows attackers to manipulate product settings, posing a risk to the integrity and confidentiality of affected systems and potentially leading to unauthorized access or data theft.

Technical Details of CVE-2021-20843

This section delves into the specifics of the vulnerability, the systems and versions affected, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises due to inadequate input validation in the Web GUI of affected products, facilitating the execution of arbitrary scripts by authenticated attackers.

Affected Systems and Versions

Products impacted include RTX830 (Rev.15.02.17 and earlier), NVR510 (Rev.15.01.18 and earlier), NVR700W (Rev.15.00.19 and earlier), and RTX1210 (Rev.14.01.38 and earlier).

Exploitation Mechanism

Remote authenticated attackers can exploit this vulnerability by enticing users to interact with a specially crafted web page containing malicious scripts that alter product configurations.

Mitigation and Prevention

This section outlines immediate actions and long-term security practices to safeguard systems against CVE-2021-20843.

Immediate Steps to Take

Update affected products to the latest patched versions provided by Yamaha Corporation.
Monitor system logs for any suspicious activities indicative of exploitation attempts.

Long-Term Security Practices

Implement robust input validation mechanisms to mitigate cross-site scripting vulnerabilities.
Conduct regular security assessments and penetration tests to identify and address potential security gaps.

Patching and Updates

Stay informed about security advisories from Yamaha Corporation and promptly apply patches to protect systems from known vulnerabilities.