Applicure dotDefender 4.0 administrative interface cross site scripting
An advisory by EnableSecurity.
Advisory URL: http://resources.enablesecurity.com/advisories/ES-20100601-dotdefender4.txt
Affected Versions: version 4.0
Fixed versions: 4.01-3 (and later)
Applicure dotDefender is a Web Application Firewall that can be installed on Windows and Linux servers.
From their website (applicure.com): "dotDefender is the market-leading software Web Application Firewall (WAF). dotDefender boasts enterprise-class security, advanced integration capabilities, easy maintenance and low total cost of ownership (TCO). dotDefender is the perfect choice for protecting your website and web applications today. "
These vulnerabilities were discovered during WAF testing by Sandro Gauci of EnableSecurity. We contacted AppliCure on May 17, 2010 about this vulnerability. They were already working on a fix.
The log viewer facility in dotDefender does not properly htmlencode user supplied input. This leads to a cross site scripting vulnerability when the log viewer displays HTTP headers.
One may use curl and insert headers containing html tags using the --header switch. Example:
curl "http://<victim>/c?a=<script>" \ --header "<script>alert(1)</script>: aa"
The following demo shows how an attacker can switch off dotDefender in order to bypass any "protection" offered by the WAF:
May 17, 2010: Initial contact Jun 01, 2010: Release of this advisory
Upgrade to the latest version of dotDefender: http://www.applicure.com/
Contact: "Sandro Gauci" <email@example.com>
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