Alvaro Munoz

@pwntester

Posts by this author

Bypassing OGNL sandboxes for fun and charities

Object Graph Notation Language (OGNL) is a popular, Java-based, expression language used in popular frameworks and applications, such as Apache Struts and Atlassian Confluence. Learn more about bypassing certain OGNL injection protection mechanisms including those used by Struts and Atlassian Confluence, as well as different approaches to analyzing this form of protection so you can harden similar systems.

Securing the fight against COVID-19 through open source

This blog describes a security vulnerability in the infrastructure that supports Germany’s COVID-19 contact tracing efforts. The mobile (Android/iOS) apps are not affected by the vulnerability and do not collect and/or transmit any personal data other than the device’s IP address. The infrastructure takes active measures to disassociate true positives from client IP addresses.