Hello Bugtraq!

I want to warn you about security vulnerabilities in ArcManager.

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Advisory: Vulnerabilities in ArcManager
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URL: http://websecurity.com.ua/4057/ 
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Timeline:
17.03.2010 - found vulnerabilities.
22.03.2010 - disclosed at my site.
23.03.2010 - informed developers.
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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/libs/captcha/CaptchaSecurityImages.php?width=150&height=100&characters=2 

Captcha bypass is possible as via half-automated or automated (with using of
OCR) methods, which were mentioned before (http://websecurity.com.ua/4043/), 
as with using of session reusing with constant captcha bypass method
(http://websecurity.com.ua/1551/), which was described in project Month of 
Bugs in Captchas.

DoS:

http://site/libs/captcha/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 all versions of ArcManager.

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