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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
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.