In this project i built a client and server for a simplified version of FTP protocol. This project uses python socket programming. First I explained FTP protocol, how it works, its advantages and ...

Newly disclosed FTP injection vulnerabilities in Java and Python that are fueled by rather common XML External Entity (XXE) flaws allow for firewall bypasses.

The Java and Python runtimes fail to properly validate FTP URLs, which can potentially allow attackers to punch holes through firewalls to access local networks. On Saturday, security researcher ...

Old vulnerabilities in both Java and Python that allow attackers to bypass firewalls and access local networks by injecting malicious commands inside FTP URLs resurfaced this week when two security ...

The Java and Python runtimes fail to properly validate FTP URLs, which can potentially allow attackers to punch holes through firewalls to access local networks.

The only time to pickle something is if you need to represent a non-string object on disk, but Python code is strings. I presume that the receiving program is basically calling eval (skt.recv ()).