SecurityReason - Deciphering the Simple Machine?s Forum audio Captcha

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Details : SecurityAlert

Topic :

Deciphering the Simple Machine?s Forum audio Captcha

SecurityAlert : 3836

CVE : CVE-2008-2019

SecurityRisk : Low alert

(About)

Remote Exploit : Yes

Local Exploit : No

Exploit Given : No

Credit : Michael Brooks

Published : 30.04.2008

Affected Software :

Simple Machine?s Forum

Advisory Text :

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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