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[极客大挑战 2019]BuyFlag

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[极客大挑战 2019]BuyFlag

wp

访问pay.php提示

If you want to buy the FLAG:
You must be a student from CUIT!!!
You must be answer the correct password!!!

抓包发现cookie有个user字段是0，改成1，然后提示要password

在注释找到了password的代码

提示要POST数据password和money，password不能是数字，但是又要==404，利用PHP的弱比较，password是404a

根据前面提示的Flag need your 100000000 money，money要比100000000大，直接使用100000000会提示Nember lenth is too long，那就使用科学计数法10e10

最后POST的数据是password=404a&money=10e10