Elusive Thoughts

 Introduction  As Crypto currency technologies are becoming more and more prevalent, as the time is passing by, and banks will soon start adopting them. Ethereum blockchain and other complex blockchain programs are relatively new and highly experimental. Therefore, we should expect constant changes in the security landscape, as new bugs and security risks are discovered, and new best practices are developed [1].This article is going to discuss how to perform a source code review in Ethereum Smart Contracts (SCs) and what to look for. More specifically we are going to focus in specific keywords and how to analyse them.  The points analysed are going to be: User supplied input filtering, when interacting directly with SC Interfacing with external SCs Interfacing with DApp applications SC formal verification Wallet authentication in DApp SC Programming Mindset When designing an SC ecosystem (a group of SCs, constitutes an ecosystem) is it wise to have some specific concepts ...

Intro This post is going to explain how to test a Denial of Service Vulnerability without crashing the actual service. More specifically we will focus on two vulnerabilities a) the slowris vulnerability (also known as Apache Partial HTTP Request Denial of Service Vulnerability) and b) the TLS Renegotiation and Denial of Service Attacks. Apache Partial HTTP Request Denial of Service Vulnerability The target application Apache Server is vulnerable to a denial of service named Slow-DoS attack, due to holding a connection open for partial HTTP requests. Both Apache Versions 1.x and 2.x are vulnerable. Slow HTTP attacks are denial-of-service (DoS) attacks in which the attacker sends HTTP requests in pieces slowly, one at a time to a Web server. If an HTTP request is not complete, or if the transfer rate is very low, the server keeps its resources busy waiting for the rest of the data. When the server’s concurrent connection pool reaches its maximum, this creates a DoS. Slow HTTP attac...