CVE-2021-27956 Explained : Impact and Mitigation

Zoho ManageEngine ADSelfService Plus before 6104 allows stored XSS on the /webclient/index.html#/directory-search user search page via the e-mail address field.

Understanding CVE-2021-27956

This CVE describes a vulnerability in Zoho ManageEngine ADSelfService Plus that enables stored XSS attacks.

What is CVE-2021-27956?

CVE-2021-27956 is a security vulnerability that exists in Zoho ManageEngine ADSelfService Plus before version 6104. It allows malicious actors to execute stored cross-site scripting (XSS) attacks using the e-mail address field on the user search page.

The Impact of CVE-2021-27956

The vulnerability could be exploited by attackers to inject malicious scripts into the application, potentially leading to unauthorized access, data theft, or further compromise of user accounts and sensitive information.

Technical Details of CVE-2021-27956

The technical details of CVE-2021-27956 include:

Vulnerability Description

The vulnerability exists in the user search page of Zoho ManageEngine ADSelfService Plus before 6104, allowing stored XSS attacks through the e-mail address field.

Affected Systems and Versions

All versions of Zoho ManageEngine ADSelfService Plus prior to 6104 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into the e-mail address field on the user search page, leading to the execution of arbitrary code in the context of the user's session.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27956, consider the following steps:

Immediate Steps to Take

Update Zoho ManageEngine ADSelfService Plus to version 6104 or later to address the vulnerability.
Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.

Long-Term Security Practices

Regularly monitor security advisories from Zoho ManageEngine for any new vulnerabilities and updates.
Conduct security assessments and penetration testing to identify and remediate vulnerabilities proactively.

Patching and Updates

Apply patches and updates released by Zoho ManageEngine promptly to ensure that your software is protected against known security vulnerabilities.