What We Do
How we do it
Resources
SECURITY ADVISORIES
May 11, 2022
CVE-2022-26923 - Active Directory Domain Services Elevation of Privilege Vulnerability
THE THREAT Microsoft has disclosed a new vulnerability impacting Active Directory Certificate Services (ADCS) tracked as CVE-2022-26923 (Active Directory Domain Services Elevation of Privilege Vulnerability). If exploited successfully, an authenticated attacker can escalate privileges in environments where ADCS is running on the domain. eSentire is aware of technical details and tooling [2] for…
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 1200+ organizations in 75+ 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
May 17, 2022
Cybersecurity Leader eSentire Continues Its Commitment to Rigorous Security Standards Earning PCI DSS Certification
Waterloo, ON, May 17, 2022 — eSentire, the Authority in Managed Detection and Response (MDR), maintains one of the most secure and robust IT environments of any MDR provider in the industry. To that end, eSentire today announced that it has received the Payment Card Industry Data Security Standard (PCI DSS) certification, considered one of the most stringent and comprehensive payment card…
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 — Apr 21, 2021

Attacks Exploiting Zero-day Vulnerabilities in SonicWall ES

Speak With A Security Expert Now

THE THREAT

On April 20th, 2021, security services firm FireEye released a report on three actively exploited zero-day vulnerabilities impacting SonicWall’s Email Security (ES) product. The vulnerabilities are tracked as CVE-2021-20021, CVE-2021-20022, and CVE-2021-20023.

At least one incident involving these vulnerabilities was identified in March 2021. Unidentified threat actors exploited the vulnerabilities to gain administrator access and execute code on SonicWall ES devices.

As threat actors are actively exploiting these vulnerabilities in the wild, organizations are strongly recommended to apply the available hotfixes as soon as possible.

What we’re doing about it

What you should do about it

Additional information

All vulnerabilities listed impact SonicWall Email Security version 10.0.9.x.

CVE-2021-20021 (CVSS: 9.4): Unauthorized administrative account creation vulnerability

CVE-2021-20022 (CVSS: 6.7): Post-authentication arbitrary file upload vulnerability

CVE-2021-20023 (CVSS: 6.7): Post-authentication arbitrary file read vulnerability

Based on the public report, these vulnerabilities were exploited in at least one real-world attack. The zero-day exploits were used by an adversary to create new administrator accounts, identify hashed passwords for existing admin accounts, create a webshell in an arbitrary directory, and perform real-time debugging. In this attack, the BEHINDER webshell was deployed to compromised assets.

It is currently unclear what the adversaries’ primary goals are and how widespread exploitation of these vulnerabilities is. For more details on the known attack, see the full FireEye report.

References:

[1] https://www.fireeye.com/blog/threat-research/2021/04/zero-day-exploits-in-sonicwall-email-security-lead-to-compromise.html
[2] https://www.sonicwall.com/support/product-notification/security-notice-sonicwall-email-security-zero-day-vulnerabilities/210416112932360/
[3] https://nvd.nist.gov/vuln/detail/CVE-2021-20021
[4] https://nvd.nist.gov/vuln/detail/CVE-2021-20022
[5] https://nvd.nist.gov/vuln/detail/CVE-2021-20023

View Most Recent Blogs