CVE-2021-20801 Explained : Impact and Mitigation

Cybozu Remote Service version 3.1.8 to 3.1.9, developed by Cybozu, Inc., is vulnerable to XML External Entity (XXE) attacks when accessed via Mozilla Firefox. This vulnerability could allow a remote authenticated attacker to access sensitive information stored in the product.

Understanding CVE-2021-20801

This section provides insights into the nature and impact of the CVE-2021-20801 vulnerability.

What is CVE-2021-20801?

CVE-2021-20801 is a security vulnerability found in Cybozu Remote Service versions 3.1.8 to 3.1.9 that enables a remote authenticated attacker to exploit XML External Entity (XXE) weaknesses and retrieve confidential data.

The Impact of CVE-2021-20801

The impact of this vulnerability is significant as attackers can leverage it to conduct XXE attacks and gain unauthorized access to sensitive information within the product.

Technical Details of CVE-2021-20801

In this section, we delve into the technical aspects of the CVE-2021-20801 vulnerability.

Vulnerability Description

Cybozu Remote Service 3.1.8 to 3.1.9 is susceptible to XXE attacks, allowing authenticated remote attackers to extract data by exploiting unspecified vectors, particularly when utilizing Mozilla Firefox.

Affected Systems and Versions

The affected systems are those running Cybozu Remote Service versions 3.1.8 to 3.1.9. Users accessing the service via Mozilla Firefox are specifically at risk.

Exploitation Mechanism

The vulnerability can be exploited through XML External Entity attacks, where attackers manipulate the XML input to access or manipulate sensitive data.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of CVE-2021-20801.

Immediate Steps to Take

Users are advised to update Cybozu Remote Service to a patched version and discontinue using Mozilla Firefox to access the service until the issue is resolved.

Long-Term Security Practices

Implementing secure coding practices, regular security audits, and user training on identifying phishing attempts can enhance long-term security.

Patching and Updates

Cybozu, Inc. has likely released patches addressing CVE-2021-20801. Users should promptly apply these patches to safeguard their systems against potential attacks.