CVE-2023-6838 : Security Advisory and Response

This CVE-2023-6838 was assigned by WSO2 and published on December 15, 2023. It involves a reflected XSS vulnerability in WSO2 products, impacting versions of WSO2 API Manager, WSO2 Identity Server, and WSO2 IS as Key Manager.

Understanding CVE-2023-6838

This vulnerability allows attackers to exploit a reflected XSS vulnerability by manipulating a request parameter in the Authentication Endpoint, affecting both authenticated and unauthenticated requests. It is identified under CAPEC-591 Reflected XSS.

What is CVE-2023-6838?

The CVE-2023-6838 vulnerability is a reflected XSS issue where threat actors can inject malicious scripts by altering request parameters in the Authentication Endpoint of affected WSO2 products.

The Impact of CVE-2023-6838

The impact of this vulnerability is rated with a CVSS base score of 6.1 (Medium severity). It requires user interaction and can lead to low confidentiality and integrity impacts, with no availability impact. The attack complexity is low, and the attack vector is via network.

Technical Details of CVE-2023-6838

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises due to improper neutralization of input during web page generation, specifically known as 'Cross-site Scripting' (CWE-79).

Affected Systems and Versions

The impacted products include:

WSO2 API Manager versions less than 3.1.0.0 and less than 3.1.0.14
WSO2 Identity Server versions less than 5.10.0.0 and less than 5.10.0.5
WSO2 IS as Key Manager versions less than 5.10.0.0 and less than 5.10.0.5

Exploitation Mechanism

Attackers can exploit this vulnerability by tampering with request parameters in the Authentication Endpoint, allowing for the injection of malicious scripts in both authenticated and unauthenticated requests.

Mitigation and Prevention

To address CVE-2023-6838, immediate steps should be taken to mitigate risks and prevent exploitation.

Immediate Steps to Take

For WSO2 Subscription holders, it is recommended to apply the provided patch/update to affected versions. Ensure to follow any instructions accompanying the patch/update. Community users can also apply relevant fixes based on public information provided by WSO2.

Long-Term Security Practices

Implement secure coding practices, input validation mechanisms, and security testing to prevent XSS vulnerabilities in web applications. Regular security assessments and updates are crucial for ongoing protection.

Patching and Updates

Stay informed of security advisories from WSO2 and promptly apply patches and updates to address known vulnerabilities, ensuring the security posture of WSO2 products remains robust.