bugtraq - Vulnerabilities in TooFAST

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Message-ID: <003e01cacced$fe513210$010000c0@ml>
Date: Fri, 26 Mar 2010 16:09:16 +0200
From: "MustLive" <mustlive@...security.com.ua>
To: <bugtraq@...urityfocus.com>
Subject: Vulnerabilities in TooFAST

Hello Bugtraq!

I want to warn you about security vulnerabilities in TooFAST.

-----------------------------
Advisory: Vulnerabilities in TooFAST
-----------------------------
URL: http://websecurity.com.ua/4053/
-----------------------------
Timeline:
17.03.2010 - found vulnerabilities.
20.03.2010 - disclosed at my site.
22.03.2010 - informed developers.
-----------------------------
Details:

These are Insufficient Anti-automation and Denial of Service
vulnerabilities.

The vulnerabilities exist in captcha script CaptchaSecurityImages.php, which
is using in this system. I already reported about vulnerabilities in
CaptchaSecurityImages (http://websecurity.com.ua/4043/).

Insufficient Anti-automation:

http://site/CaptchaSecurityImages.php?width=150&height=100&characters=2

Captcha bypass is possible via half-automated or automated (with using of
OCR) methods, which were mentioned before (http://websecurity.com.ua/4043/).

DoS:

http://site/CaptchaSecurityImages.php?width=1000&height=9000

With setting of large values of width and height it's possible to create
large load at the server.

Vulnerable are TooFAST 1.5 and previous versions.

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua