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Jul 29, 2021
UPDATE: PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of the NTLM Relay attack discovered by security researcher Gilles Lionel. It is tracked as an authentication bypass vulnerability in Active Directory (Certificate Services); currently no CVE identifier has been assigned to this vulnerability. Proof of Concept (PoC) code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to…
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Tecala and eSentire Partner to Protect Enterprises across APAC from Business-Disrupting Cyber Attacks
Sydney, 12 July, 2021 - Tecala, Australia’s award-winning technology services and IT consulting provider, today announced it has chosen eSentire, the global Authority in Managed Detection and Response (MDR) cybersecurity services, as their exclusive MDR solution provider in Australia and New Zealand. This partnership will enable Tecala to augment its cybersecurity practice and offer enterprises…
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Security advisories — Apr 21, 2021

Attacks Exploiting Zero-day Vulnerabilities in SonicWall ES

2 min read

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.

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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