A Vulnerability in Zoho Desktop Central and Desktop Central MSP Could Allow for Authentication Bypass

ITS ADVISORY NUMBER: 

2022-008

DATE(S) ISSUED: 

Tuesday, January 18, 2022

SUBJECT: 

A Vulnerability in Zoho Desktop Central and Desktop Central MSP Could Allow for Authentication Bypass

OVERVIEW: 

A vulnerability has been discovered in Zoho Desktop Central and Desktop Central MSP that could allow for authentication bypass. Zoho Desktop Central and Desktop Central MSP are unified endpoint management (UEM) solution that helps in managing servers, laptops, desktops, smartphones, and tablets from a central location. It allows admins to deploy patches and software over the network and troubleshoot them remotely. Successful exploitation of this vulnerability could allow for a remote user to perform unauthorized actions on a server including access to unauthorized data or the ability the write an arbitrary zip file.

THREAT INTELLIGENCE:

There are currently not reports of this vulnerability being exploited in the wild.

SYSTEMS AFFECTED: 

  • Zoho ManageEngine Desktop Central and Desktop Central MSP versions prior to 10.1.2137.9  

RISK:

Government:

Large and medium government entities: High

Small government entities: Medium

Business:

Large and medium business entities: High

Small business entities: Medium

Home Users: Low

DESCRIPTION: 

A vulnerability has been discovered in Zoho Desktop Central and Desktop Central MSP that could allow for authentication bypass. This vulnerability exists due to the way the Zoho Desktop Central and Desktop Central MSP handle certain requests. When an unauthenticated attacker sends a specially crafted request to Zoho Desktop Central or Desktop Central MSP, it could allow them to bypass authentication. Successful exploitation of this vulnerability could allow for a remote user to perform unauthorized actions on a server including access to unauthorized data or the ability the write an arbitrary zip file.

ACTIONS: 

  • Verify no unauthorized changes have occurred before applying patches/updates.
  • After appropriates testing, immediately upgrade Zoho Desktop Central and Desktop Central MSP (10.1.2137.9  and later versions) to a fixed version as provided by Zoho.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES: 

BleepingComputer:
https://www.bleepingcomputer.com/news/security/zoho-plugs-another-critic...

ManageEngine:
https://pitstop.manageengine.com/portal/en/community/topic/a-critical-se...
https://www.manageengine.com/products/desktop-central/cve-2021-44757.html

CVE:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44757