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Hackers Infect Employees of Law Firms, Manufacturing Companies, and Financial Services Orgs. with Increasingly Pervasive Infostealer, SolarMarker
SolarMarker Infects 5X More Corporate Victims Using Over a Million Poisoned WordPress Pages Key Takeaways eSentire has observed a fivefold increase in SolarMarker infections. Prior to September, eSentire’s Threat Response Unit (TRU) detected and shut down one infection per week. Beginning in September, TRU averaged the detection and shutdown of five per week. SolarMarker is a…
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Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Security advisories — Apr 21, 2021

Attacks Exploiting Zero-day Vulnerabilities in SonicWall ES

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