C/C++ checklist challenges, solved

This article explains two security bugs found in C/C++ code samples: a Linux ping program vulnerable to command injection because inet_ntoa (a function that converts IP addresses to text) returns a pointer to a global buffer that gets overwritten by subsequent calls, allowing an attacker to bypass IP validation checks; and a Windows driver with a registry type confusion vulnerability where missing validation flags can escalate from a local denial of service to kernel write access (the ability to modify system memory).