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I want to brute-force a site using Hydra (https-post-form) that I don't know valid login credentials for, so I cannot specify a value for success condition (S=).

Failed logins result in a redirect to one of two different failure pages with no words in common.

How can I specify multiple values to F=, e.g., F=(fail)|(tak) (regular expression)?

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Assuming Hydra was compiled with PCRE (regular expression) support, the pattern you supply should be treated as a regular expression. You should be able to use | as a pattern "or" operator.

Here's the relevant source code: https://github.com/vanhauser-thc/thc-hydra/blob/eb064c4222964ecac9dc757ad8c847b130c43deb/hydra-http-form.c#L563-L567

You can tell if Hydra was not compiled with PCRE support because it will specifically mention "regex support" on the "These services were not compiled" list: https://github.com/vanhauser-thc/thc-hydra/blob/eb064c4222964ecac9dc757ad8c847b130c43deb/hydra.c#L2142-L2146

If you don't have PCRE support, you'll need to recompile Hydra from the repository.

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  • Thank you. How can I check if Hydra was compiled with PCRE by starting it up (where to look)? – Shuzheng Jul 14 '18 at 17:01
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    When you run Hydra with the -h flag, it'll show you all the available options and all of the unavailable modules. If you see regular expressions in the unavailable list, then you do not have regular expression support. – Mr. Llama Jul 14 '18 at 17:07
  • My list is as follows: These services were not compiled in: afp ncp oracle sapr3.. Nothing is said about features, like regular expression, not compiled in? – Shuzheng Jul 14 '18 at 17:57
  • @Shuzheng - I don't see what the problem is then. You should have regular expression support which means supplying a regular expression in your pattern should work fine. No additional tweaking required. – Mr. Llama Jul 16 '18 at 15:01
  • Regex worked for me. Thanks. – Swagger 68 Jun 5 '20 at 0:51

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