CVE-2021-20798 : Security Advisory and Response

Cybozu Remote Service versions 3.1.8 to 3.1.9 are affected by a cross-site scripting vulnerability, allowing remote authenticated attackers to inject arbitrary scripts via unspecified vectors.

Understanding CVE-2021-20798

This CVE identifies a critical security issue in Cybozu Remote Service versions 3.1.8 to 3.1.9, potentially exposing organizations to malicious attacks.

What is CVE-2021-20798?

The CVE-2021-20798 vulnerability involves a cross-site scripting flaw in the management screen of Cybozu Remote Service. This allows remote authenticated attackers to insert and execute malicious scripts via unknown methods.

The Impact of CVE-2021-20798

The impact of this vulnerability is significant as it enables attackers to execute arbitrary scripts within the context of the user's session. This could lead to unauthorized data access, account hijacking, or further compromise of the affected system.

Technical Details of CVE-2021-20798

Cybozu Remote Service version 3.1.8 to 3.1.9 contains a security flaw that lacks proper input validation, enabling attackers to inject malicious scripts.

Vulnerability Description

The vulnerability arises due to inadequate sanitization of user-supplied data in the management screen, allowing attackers to embed scripts that can be executed by other users accessing the same page.

Affected Systems and Versions

Cybozu Remote Service versions 3.1.8 to 3.1.9 are confirmed to be impacted by this vulnerability, putting organizations using these versions at risk.

Exploitation Mechanism

Remote authenticated attackers can exploit this security loophole by injecting specially crafted scripts through unidentified attack vectors, leveraging the XSS vulnerability to execute malicious code.

Mitigation and Prevention

It is crucial for organizations to take immediate action to secure their systems against CVE-2021-20798 and prevent potential exploitation.

Immediate Steps to Take

Organizations are advised to upgrade Cybozu Remote Service to a patched version that addresses the cross-site scripting vulnerability. Additionally, administrators should monitor for any unusual activities that might indicate exploitation.

Long-Term Security Practices

Employing robust input validation mechanisms, conducting regular security audits, and educating users on safe browsing habits can help mitigate the risk of similar vulnerabilities in the future.

Patching and Updates

Cybozu, Inc. has released a fix for the CVE-2021-20798 vulnerability. Organizations should promptly apply the latest patches and updates provided by the vendor to eliminate the security risk posed by this vulnerability.