SimpleAuth4 min read

Welcome back on Exploitnetworking. SimpleAuth is a web challenge of TokyoWesterns CTF. The base of this challenge is manipulate the php function parse_str to bypass auth control and get the flag. Below there is the source code of back-and:

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For print the flag, our goal is bypass this condiction:

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Only way to bypass it is set hashed_password variable. For this purpose we can use parse_str function, and set hashed_password in url whitout set user and pass. In this way we have hashed_password equal to hash value. Then we can use this url:

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And get the flag:

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I Accept
2018-09-03T19:56:44+00:00

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