[Full-disclosure] Vulnerabilities in MaxSite Anti Spam Image for WordPress

["MustLive" <mustlive@xxxxxxxxxxxxxxxxxx>]

Hello list!

I want to warn you about Insufficient Anti-automation vulnerability in
MaxSite Anti Spam Image plugin for WordPress.

This is modified version of original plugin Anti Spam Image, about
vulnerability in which I wrote in 2007 in my project Month of Bugs in
Captchas. This captcha is vulnerable to session reusing with constant
captcha bypass method, like original Anti Spam Image, on which base this
plugin is made.

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Affected products:
-------------------------

Vulnerable are MaxSite Anti Spam Image 0.6 and potentially all other
versions of this plugin.

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Details:
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Insufficient Anti-automation (WASC-21):

Exploit:

http://websecurity.com.ua/uploads/2011/MaxSite%20Anti%20Spam%20Image%20CAPTCHA%20bypass.html

Vulnerability has place on old versions of PHP. It shows only in PHP <
4.4.7, which has bug which leads to error in work of web application's
algorithm, which leads to possibility of captcha bypass.

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Timeline:
------------

2007.12.01 - found vulnerability.
2007.12.01 - informed developer.
2011.03.29 - disclosed at my site.

I mentioned about this vulnerability at my site
(http://websecurity.com.ua/5045/).

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


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