CVE-2019-20437 : Vulnerability Insights and Analysis

A vulnerability was found in WSO2 API Manager 2.6.0, WSO2 IS as Key Manager 5.7.0, and WSO2 Identity Server 5.8.0 that allows execution of Cross-Site Scripting (XSS) payloads under specific conditions.

Understanding CVE-2019-20437

This CVE identifies a security flaw in WSO2 products that could lead to the execution of XSS payloads.

What is CVE-2019-20437?

When a user selects a custom claim dialect with an XSS payload as the provisioning claim in the advanced claim configuration of an Identity Provider, the XSS payload can be executed.

The Impact of CVE-2019-20437

CVSS Base Score: 6.1 (Medium)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality Impact: Low
Integrity Impact: Low
Availability Impact: None

Technical Details of CVE-2019-20437

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The issue arises when a custom claim dialect with an XSS payload is configured in the identity provider basic claim configuration, allowing the payload to execute under specific conditions.

Affected Systems and Versions

WSO2 API Manager 2.6.0
WSO2 IS as Key Manager 5.7.0
WSO2 Identity Server 5.8.0

Exploitation Mechanism

The attacker needs to have the necessary privileges to access the management console and modify identity provider configurations to exploit this vulnerability.

Mitigation and Prevention

Protect your systems from CVE-2019-20437 with the following steps:

Immediate Steps to Take

Disable access to the management console for unauthorized users.
Regularly monitor and review identity provider configurations.

Long-Term Security Practices

Implement least privilege access controls.
Conduct regular security training for users on XSS prevention.

Patching and Updates

Apply the latest security patches and updates provided by WSO2 to address this vulnerability.