Security Experts:

Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Application Security

Zoho Confirms Zero-Day Authentication Bypass Attacks

Zoho has shipped an urgent patch for an authentication bypass vulnerability in its ManageEngine ADSelfService Plus alongside a warning that the bug is already exploited in attacks.

Tracked as CVE-2021-40539, the security flaw is deemed critical as it could be exploited to take over a vulnerable system.

Zoho has shipped an urgent patch for an authentication bypass vulnerability in its ManageEngine ADSelfService Plus alongside a warning that the bug is already exploited in attacks.

Tracked as CVE-2021-40539, the security flaw is deemed critical as it could be exploited to take over a vulnerable system.

The issue, according to a Zoho advisory, affects the REST API URLs in ADSelfService Plus and could be abused to achieve remote code execution. Technical details on the vulnerability have yet to be published.

“This is a critical issue. We are noticing indications of this vulnerability being exploited,” Zoho warned.

All ADSelfService Plus builds up to 6113 were found vulnerable to the issue and customers are advised to immediately update ADSelfService Plus to build 6114 or later.

In a separate advisory on Tuesday, the U.S. government’s Cybersecurity and Infrastructure Security Agency (CISA) urged administrators to review Zoho’s advisory and update ADSelfService Plus immediately.

“CVE-2021-40539 has been detected in exploits in the wild. A remote attacker could exploit this vulnerability to take control of an affected system,” CISA said.

An integrated self-service password management and single sign-on solution, ManageEngine ADSelfService Plus can be used with Active Directory and cloud apps to create password policies, implement authentication techniques, and enforce two-factor authentication (2FA), among others.

Related: Microsoft Office Zero-Day Hit in Targeted Attacks

Related: Google: New Chrome Zero-Day Being Exploited

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Expert Insights

Related Content

Application Security

Cycode, a startup that provides solutions for protecting software source code, emerged from stealth mode on Tuesday with $4.6 million in seed funding.

Network Security

NSA publishes guidance to help system administrators identify and mitigate cyber risks associated with transitioning to IPv6.

Nation-State

The North Korean APT tracked as TA444 is either moonlighting from its previous primary purpose, expanding its attack repertoire, or is being impersonated by...

Mobile & Wireless

Technical details published for an Arm Mali GPU flaw leading to arbitrary kernel code execution and root on Pixel 6.

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

Malware & Threats

Microsoft plans to improve the protection of Office users by blocking XLL add-ins from the internet.

Mobile & Wireless

Apple’s iOS 12.5.7 update patches CVE-2022-42856, an actively exploited vulnerability, in old iPhones and iPads.