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| Subject: | Deciphering the Simple Machines Forum audio Captcha |
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| Date: | 19 Apr 2008 23:38:09 -0000 |
The Simple Machine?s Forum audio Captcha that has been hardened from attack. I have contacted SMF about this flaw and it has been verified. I go into greater detail of how i am able to break this captcha here: http://www.rooksecurity.com/blog/?p=6 Exploit Code: http://www.rooksecurity.com/exploits/smf_captcha.zip This captcha has been broken before and exploit code is available here: http://www.securityfocus.com/archive/1/471641 . The fix was to add a randomly generated static. I was able to write code to decipher the audio file using a Fuzzy Logic comparison http://en.wikipedia.org/wiki/Fuzzy_logic . The comparison is the Hamming Distance http://en.wikipedia.org/wiki/Hamming_distance between the original audio file and the damaged one generated by the Captcha. peace
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