Remote code execution in Zoho ADSelfService Plus

1) Improper access control

EUVDB-ID: #VU56414

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-40539

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: Yes

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Zoho ManageEngine ADSelfService Plus: 6000 - 6113

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.