External risk intelligence

Zoho ManageEngine ADSelfService Plus: Authentication Bypass and Remote Code Execution

CVE advisoryKnown Exploit

CVE-2021-40539

Zoho ManageEngine ADSelfService Plus has a vulnerability allowing authentication bypass and remote code execution. This could lead to unauthorized system control and data compromise. This presents a significant business risk.

5Halo Surface Signal

Remote Code Execution

Zohocorp Manageengine Adselfservice Plus

before 6.16.1

External exposure likelihood

Halo Surface Signal score for CVE-2021-40539

This product is an identity and self-service password management portal designed to be accessed by end-users across an organization. These portals are typically exposed to the internet or widely accessible within a network to facilitate remote password resets, making them a common, public-facing service by design.

Horizon Alert

Summary of the vulnerability and why it matters

Zoho ManageEngine ADSelfService Plus contains a flaw within its REST API. This vulnerability allows for unauthorized access and can lead to the execution of malicious code. The impact could involve unauthorized system control and data compromise.

  • Vulnerable REST API
  • Authentication bypass weakness
  • Remote code execution impact

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to bypass authentication in the product's REST API, leading to the execution of arbitrary code on the affected system. The attack vector involves the product's network accessibility and the absence of authentication requirements for specific API endpoints. Successful exploitation could grant an attacker unauthorized access and control over the impacted system, potentially affecting data integrity and business operations.

  • Publicly accessible system.
  • Unauthenticated API access.
  • Execute remote code.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability presents a significant risk due to its potential for unauthorized access and remote code execution within an organization's network. Attackers can bypass authentication mechanisms to gain control of systems. Organizations should prioritize addressing this vulnerability to prevent data compromise and system disruption.

  • Attackers with low skill level.
  • No access or conditions required.
  • Business risk is critical and urgent.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in Zoho ManageEngine ADSelfService Plus allows for authentication bypass and remote code execution. Attackers can exploit this to gain unauthorized access and execute arbitrary code, posing a significant risk to organizational data and systems. Immediate action is required to mitigate potential impact and secure the environment.

  • Find affected assets.
  • Reduce exposure or isolate risk.
  • Fix, verify, and monitor.

Frequently asked questions

What is Zoho ManageEngine ADSelfService Plus?

Zoho ManageEngine ADSelfService Plus is a self-service password management and identity management solution. It helps users reset their passwords, unlock their accounts, and manage their personal details without needing IT intervention. This product is used by organizations to streamline identity-related tasks for their employees.

What is the weakness in CVE-2021-40539?

The weakness in CVE-2021-40539 is an authentication bypass via the REST API, categorized as CWE-706. This means an attacker can trick the software into thinking they are a legitimate user, even without proper credentials. This bypass then allows for the execution of arbitrary code on the affected system.

How can an attacker exploit CVE-2021-40539?

An attacker can exploit this vulnerability by sending specially crafted requests to the product's REST API. The vulnerability is triggered by the API's failure to properly validate authentication. It is important to note that the vulnerability is not triggered if the affected component is not exposed to the network.

Who should care about the Zoho ManageEngine ADSelfService Plus vulnerability?

Organizations using Zoho ManageEngine ADSelfService Plus should be concerned. According to Halo Surface Signal, this product is very likely to be internet-facing or widely accessible within a network, making it a prime target for external attackers.

What are the first steps to address this threat?

The initial steps to address this vulnerability involve identifying all instances of Zoho ManageEngine ADSelfService Plus within your environment. Subsequently, focus on reducing the exposure of these systems or isolating them if immediate patching is not possible. Finally, apply the necessary fixes provided by Zoho and verify their implementation.

References