Zero-day vulnerability in Zoho ManageEngine ADSelfService Plus

Improper access control
CVE-2021-40539

Vulnerability details

Advisory: SB2021090902 - Remote code execution in Zoho ADSelfService Plus

Vulnerable component: Zoho ManageEngine ADSelfService Plus

CVE-ID: CVE-2021-40539

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-284 - Improper Access Control

Description:

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper access restrictions to the "/RestAPI/LogonCustomization" and "/RestAPI/Connection" REST API endpoints. A remote non-authenticated attacker can send specially HTTP requests to the aforementioned REST API endpoints and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html