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Ryan Seguin

Security Response Manager

Profile picture for user Ryan Seguin

Ryan joined Tenable in 2013 as a customer support engineer assisting customers with technical troubleshooting and product education. After that, he helped create dashboard and report templates for SecurityCenter that users can download through the Tenable.sc feed. Now Ryan is a member of the Security Response team, informing customers of the latest security threats, and providing in-depth analytics for today’s most critical vulnerabilities.

Interests outside of work: Ryan is a retro video game console/arcade hardware enthusiast and modder, and he is also studying Japanese and hopes to one day be fluent.

Blog Post

CVE-2020-1472: 'Zerologon' Vulnerability in Netlogon Could Allow Attackers to Hijack Windows Domain Controller

Security researchers reveal how the cryptographic authentication scheme in Netlogon can be exploited to take control of a Windows domain controller (DC). Update: September 21, 2020: The ‘Identifying Affected Systems’ section has been updated to include instructions for our new unauthenticated check for Zerologon.

Blog Post

CVE-2020-10713: “BootHole” GRUB2 Bootloader Arbitrary Code Execution Vulnerability

Recently disclosed vulnerability in GRUB2 bootloader dubbed “BootHole” could allow an attacker to gain silent malicious persistence by attacking the GRUB2 config file, grub.cfg.

Blog Post

CVE-2020-8193, CVE-2020-8195, and CVE-2020-8196: Active Exploitation of Citrix Vulnerabilities

Following active exploitation against F5 BIG-IP devices, exploit attempts targeting newly disclosed vulnerabilities in Citrix products have begun, which include potential extrac

Blog Post

CVE-2020-11896, CVE-2020-11897, CVE-2020-11901: Ripple20 Zero-Day Vulnerabilities in Treck TCP/IP Libraries Disclosed

Researchers discovered 19 new zero-day vulnerabilities in a TCP/IP software library developed by Treck. Dubbed Ripple20, the batch includes CVE-2020-11901, which has the potential to allow control of an internet-connected device.

Blog Post

CVE-2020-12720: vBulletin Urges Users to Patch Undisclosed Security Vulnerability

vBulletin released patches for an undisclosed security vulnerability, encouraging users to apply the patch as soon as possible. Update 05/12/20: Updated the Analysis and Proof of concept section to reflect the availability of PoCs from a vulnerability researcher.

Blog Post

Adobe Type Manager Library Font Parsing Remote Code Execution Vulnerabilities Exploited in the Wild (ADV200006)

Microsoft releases an out-of-band advisory for remote code execution vulnerabilities being actively exploited in the wild. Update April 14, 2020: Microsoft has updated its advisory with reference to CVE-2020-1020, and our solution section has been updated as well.

Blog Post

ThemeGrill Demo Importer Vulnerability Actively Exploited in the Wild

Severe vulnerability in ThemeGrill Demo Importer WordPress plugin is being actively exploited in the wild. Users should upgrade to version 1.6.3 ASAP.

Blog Post

CVE-2019-19781: Unauthenticated Remote Code Execution Vulnerability in Citrix ADCs and Gateways

Citrix urges customers to apply mitigation steps for CVE-2019-19781, a remote code execution vulnerability exploitable through specially crafted HTTP requests to vulnerable devices.

Blog Post

Oracle Critical Patch Update for October Contains 180 Fixes

Oracle addresses 180 CVEs across 219 security patches in October’s Critical Patch Update, including a critical vulnerability in Oracle NoSQL Database.

Blog Post

Critical Zero-Day Pre-authentication Remote Code Execution Exploit Published for 5.x Versions of vBulletin

New critical zero-day pre-auth RCE exploit code published on Full Disclosure mailing list for 5.x versions of vBulletin (CVE-2019-16759). UPDATE 09/25/2019: The background and solution sections below have been updated to reflect the security patch issued by the vBulletin team.

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