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Gerben Kleijn

Senior Security Consultant

Gerben Kleijn (OSCP, CISSP) is a Senior Security Consultant for Bishop Fox, where he primarily focuses on external network penetration tests and web application assessments, as well as cloud deployment reviews for Amazon Web Services (AWS). He has advised Fortune 500 brands and startups in industries such as media, retail, and software in addition to popular websites, credit reporting agencies, and marketing platforms.

The Latest From Gerben

Advisories
OpenClinic Version 0.8.2
Dec 1, 2020 6:00:00 AM | By Gerben Kleijn
ADVISORY SUMMARY Four vulnerabilities were discovered in the OpenClinic application, the most severe of which allowed an unauthenticated attacker... continue reading
Tech Blog
Well, That Escalated Quickly
Dec 19, 2019 3:47:53 PM | By Gerben Kleijn
Investigating PrivEsc Methods in AWS In 2018, Spencer Gietzen wrote an excellent article on privilege escalation in AWS, identifying 21 separate... continue reading
Tech Blog
Escalator to the Cloud: 5 Privesc Attack Vectors in AWS
Dec 19, 2019 3:47:22 PM | By Gerben Kleijn
In 2018, Spencer Gietzen identified 21 methods across various AWS services that could lead to privilege escalation. Since then, I’ve often... continue reading
Tech Blog
An Introduction to AWS Cloud Security
Aug 28, 2018 3:40:43 PM | By Gerben Kleijn
Amazon Web Services (AWS) isn’t the novelty it was a decade ago. Resource-intensive, computer-heavy work today flows upward from giant... continue reading
Tech Blog
A Guide to AWS S3 Buckets Security
Jul 10, 2018 12:50:40 PM | By Gerben Kleijn
Avoid Common Mistakes When Deploying Cloud-based Services Download the full PDF guide here: continue reading
Tech Blog
Stand Your Cloud #3: AWS Provisioning and Access Requests
Nov 14, 2017 10:43:44 AM | By Gerben Kleijn
This blog post is the closing chapter in a series about AWS security best practices. Read the first post and second post in this series for... continue reading

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