I am looking for free ctf sites like ctf365, but I want a challenge and not vulnerable-by-design machines. Any references?
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1You seem to be asking for a structured, progressive hackable series of targets, but where the targets are not vulnerable by design? I'm not sure such a thing could possibly exist. If you are looking for a challenge, you might troll exploit sites and apply the PoCs to the targets.– schroeder ♦Jun 11, 2016 at 9:22
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Maybe some of the challenges from this question are of interest? security.stackexchange.com/questions/3592/…– Steve KlineJun 11, 2016 at 11:18
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Just take a look at this ctftime.org– mallocJun 11, 2016 at 16:34
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Here there are a lot of .iso containing ctf: https://www.vulnhub.com/ there a lot, some are stupid , others are more interesting.
Then there is exploit-exercises.com that has some very good ctf box. Another is www.root-me.org that has a lot of challange and some ctf too. Anyway, a ctf that is "not vulnerable by design" doesn't exists. You can take some open source project and try too find some vuln, or maybe look for https://bugcrowd.com/ , that lists all bug bounties