Summary

This chapter introduces format string vulnerabilities, explains how to test for them, and walks through the details of how the vulnerability works. Format string vulnerabilities are an excellent example of what can happen when functions use untrusted input to determine the layout of the stack. Fortunately, you can use a fairly straightforward set of functions to review and test cases to try to find these bugs. The walkthrough provides you with additional details of how format string attacks work and ammunition you might need to get these bugs fixed despite the fact modern compilers introduce hurdles for the attacker to overcome .