Type: Deniel of Service Severity: Critical Title: AToZed Software IntraWeb Component for Borland Delphi and Kylix DoS vulnerability Date: January 23, 2007
A DoS vulnerability exists in the IntraWeb Component of AToZed Software.
IntraWeb is a RAD component for Borland Delphi and Kylix by AToZed Software, which allows developers to rapidly develop webapplication. This component is commonly used by Borland developers internationally.
DoS conditions occurs, when a specially crafted HTTP request is sent to the webapplication. After the request, the affected thread enters into an infinte loop, and hangs. Under IIS 5.x, the thread will never be stopped. Under IIS 6 the webserver automatically stops the thread after the configured amount of time, or CPU usage.
An attack can cause the webapplication to slow down, and after more specially crafted request, to stop processing requests.
There is no vendor supplied workaround for the problem at this time.
A possible workaround can be, to filter the request body for the special request, and repair it. It can be achieved, by overriding the function called "OnBeforeDispatch" of the TIWServerController object, and repair the request, by changing the "Request.Content" field.
IntraWeb 8.0 and lower versions
2006.08. - Vendor notified, but no answer 2007.01.23 - Vulnerability publicly available
Discovery is credited to: C0r31mp4ct