I always get a generic flag as result

Question

Hi!

Im currently trying to solve the latest CTF challenge (TLS attacker). So far, the workflow seems to work as I don't get any more errors and even receive a flag (though an invalid flag) as a response. However the problem is that no matter what I send as my IMT name in the final application message, the server completely ignores my message and continues with the Data: 54 65 73 74 (Test), generating the same invalid flag.

That's why I wanted to ask whether there is a technical problem on the server side or a logical error on my side. Should the latter be the case, could you give me a small tip about what might cause such behavior?

Thanks a lot in advance!

Answer 1

Hi,

In this case you most likely do not set the data correctly for your application message. There is no problem on the server side.

Comments

<Application>
        <data>
             imt name in hex
        </data
</Application>

would this not be enough to set the data ?

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I'm not sure what happens when you type it like. But as long as you adhere to the instructions in the wiki it should work:
https://github.com/tls-attacker/TLS-Attacker/wiki/Modifiable-Variables

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Ok I found what was wrong with it. Thank you very much