CVE-2021-42535 : What You Need to Know

A vulnerability in VISAM VBASE Pro-RT/ Server-RT (Web Remote) version 11.6.0.6 could allow an attacker to conduct cross-site scripting attacks.

Understanding CVE-2021-42535

This CVE pertains to a security issue in the VISAM VBASE Editor related to the handling of user-controllable input.

What is CVE-2021-42535?

CVE-2021-42535 involves the failure of VISAM VBASE version 11.6.0.6 to properly neutralize user-controllable input before displaying it on a public-facing webpage, enabling Cross Site Scripting (XSS) attacks.

The Impact of CVE-2021-42535

CVSS Base Score: 5.3 (Medium)
Attack Vector: Network
Confidentiality Impact: High
User Interaction: Required
The vulnerability does not require privileges, but user interaction is necessary to exploit it.

Technical Details of CVE-2021-42535

This section provides in-depth technical insights into CVE-2021-42535.

Vulnerability Description

VISAM VBASE version 11.6.0.6 fails to properly sanitize user-controlled input before displaying it on web pages, potentially leading to XSS attacks.

Affected Systems and Versions

Affected Product: VBASE Pro-RT/ Server-RT (Web Remote) by VISAM
Affected Version: 11.6.0.6

Exploitation Mechanism

Attack Complexity: High
Privileges Required: None
Scope: Unchanged
The vulnerability can be exploited over the network without requiring advanced privileges.

Mitigation and Prevention

Following best practices is essential to prevent exploitation of CVE-2021-42535.

Immediate Steps to Take

Users should update to VISAM VBASE v11.7.0.2 or newer versions.
Carefully scrutinize user inputs that are displayed on public web pages to prevent XSS vulnerabilities.

Long-Term Security Practices

Regular security training for developers to understand and mitigate XSS risks.
Implement Content Security Policy (CSP) to reduce the impact of XSS attacks.

Patching and Updates

Ensure timely installation of security patches and updates provided by VISAM to address known vulnerabilities.