Posts tagged with format-string

Challenge

This program is quite short, but has got printf and gets in it! This shouldn't be too hard, right?

Connect at nc shell.2019.nactf.com 31283

We are given the libc used, the binary, and the source code.

#include <stdio.h>

void vuln()
{
	char buf[64];
	fputs("Type something>", stdout);
	gets(buf);
	fputs("You typed: ", stdout);
	printf(buf);
}

int main()
{
	/* Disable buffering on stdout */
	setvbuf(stdout, NULL, _IONBF, 0);

	vuln();

	return 0;
}
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