What We Do
How we do it
Resources
TRU INTELLIGENCE CENTER
Our Threat Response Unit (TRU) publishes security advisories, blogs, reports, industry publications and webinars based on its original research and the insights driven through proactive threat hunts.
View Threat Intelligence Resources →
SECURITY ADVISORIES
Nov 21, 2022
ProxyNotShell Exploit Released
THE THREAT eSentire is aware of public Proof-of-Concept (PoC) exploit code for the ProxyNotShell Exchange vulnerabilities (CVE-2022-41040 [CVSS:8.8], CVE-2022-41082 [CVSS:8.0]). The publication of…
Read More
View all Advisories →
Company
ABOUT ESENTIRE
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1500+ organizations in 80+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
Read about how we got here
Leadership Work at eSentire
LATEST PRESS RELEASE
Nov 07, 2022
Global Cybersecurity Leader eSentire Partners with InfoTrust to Deliver 24/7 Multi-Signal MDR and IR Services Across Australia
Waterloo, ON and Sydney, Australia – November 9, 2022 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced it has expanded its presence in Australia via a strategic partnership with InfoTrust. InfoTrust is a leading specialized cybersecurity provider that combines next-generation security controls, with the InfoTrust “Connective Tissue” of customer success,…
Read More
Partners
PARTNER PROGRAM
e3 Ecosystem
We provide sophisticated cybersecurity solutions for Managed Security Service Providers (MSSPs), Managed Service Providers (MSPs), and Value-Added Resellers (VARs). Find out why you should partner with eSentire, the Authority in Managed Detection and Response, today.
Learn more
ECOSYSTEM PARTNER RESOURCES
Apply to become an e3 ecosystem partner with eSentire, the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Search
Resources
Security advisories — Sep 09, 2021

Critical Zoho Zero-Day Vulnerability

1 minute read
Speak With A Security Expert Now

THE THREAT

On September 8th, 2021, Zoho announced a critical zero-day authentication bypass vulnerability impacting the ManageEngine ADSelfService Plus solution. Attacks exploiting this vulnerability are ongoing; organizations are strongly recommended to apply the available security patches as soon as possible.

The vulnerability is tracked as CVE-2021-40539; it is an authentication bypass vulnerability that allows for Remote Code Execution (RCE). According to the Cybersecurity and Infrastructure Agency (CISA), an unauthenticated remote actor may exploit this vulnerability to take control of affected systems. As attacks are ongoing and alternative mitigations are not available, it is critical that impacted organizations apply the Zoho provided security patches as soon as possible.

What we’re doing about it

What you should do about it

Additional information

CVE-2021-40539 impacts all ManageEngine ADSelfService Plus builds versions 6113 and below.

Information relating to this vulnerability and real-world attacks is still limited. Public sources have stated that attacks exploiting CVE-2021-40539 have been ongoing for at least a week prior to patch release. These attacks are believed to be targeted in nature. No Proof-of-Concept exploit code is known to exist at this time. As the vulnerability is now public knowledge, it is likely that additional threat actor groups will develop exploits in the near future, leading to widespread exploitation.

References:

[1] https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html
[2] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40539
[3] https://us-cert.cisa.gov/ncas/current-activity/2021/09/07/zoho-releases-security-update-adselfservice-plus
[4] https://help.zoho.com/portal/en/kb/vault/integration-guide/articles/password-manager-syslog-siem-integration#Integration_with_Loggly
[5] https://therecord.media/cisa-warns-of-zoho-server-zero-day-exploited-in-the-wild/
[6] https://twitter.com/voodoodahl1/status/1435673340539281410

View Most Recent Blogs