Web Reference: To discover whether the application is vulnerable to this type of attack, it’s necessary to verify if the format function accepts and parses the format string parameters shown in table 2. A format string vulnerability is a bug where user input is passed as the format argument to printf, scanf, or another function in that family. The format argument has many different specifiers which could allow an attacker to leak data if they control the format argument to printf. I briefly explain that a format string vulnerability occurs when user-supplied input is evaluated as a command by the application (in this case, by printf). This can allow an attacker to execute code, read from the stack, or cause a crash.
YouTube Excerpt: Solving format1 from exploit-exercises.com with a simple
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