Hello Bugtraq! I want to warn you about security vulnerabilities in system NovaBoard. In this advisory I'm continue to inform readers of mailing lists about vulnerable web applications which are using CaptchaSecurityImages.php. If you read Bugtraq you can saw the letter which was posted last week by one developer of one such vulnerable web application (which I posted to the list before). And from that letter it's clearly seen, that web developers ignore advisory about holes in CaptchaSecurityImages.php itself, and only draw attention on advisories about their specific web applications. So, as I already wrote to the list, it's only way to draw attention of web developers to these issues. ----------------------------- Advisory: Vulnerabilities in NovaBoard ----------------------------- URL: http://websecurity.com.ua/4094/ ----------------------------- Affected products: NovaBoard 1.1.2 and previous versions. ----------------------------- Timeline: 17.03.2010 - found vulnerabilities. 02.04.2010 - disclosed at my site. 03.04.2010 - 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/scripts/php/captcha/CaptchaSecurityImages.php?width=150&height=100 Captcha bypass is possible via half-automated or automated (with using of OCR) methods, which were mentioned before (http://websecurity.com.ua/4043/). Value of characters is fixed. DoS: http://site/scripts/php/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. Best wishes & regards, MustLive Administrator of Websecurity web site http://websecurity.com.ua
