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Brought to you by:
Suppliers of:
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| "Easy Chat Server is a easy, fast and affordable way to host and manage your own real-time communication software, it allows friends/colleagues to chat with you through a Web Browser (IE, Netscape, Mozilla, Opera etc.) on any computer (Windows, Linux, Solaris...) without any special plug-ins or software. It can help you setup your community chat rooms, collaborative work sessions or online meetings". Easy Chat suffers from vulnerabilities that allow malicious users to crash it in more than one way, one of which is the addition of an unusually large amount of users. |
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Credit:
The information has been provided by Donato Ferrante.
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Vulnerable Systems:
* Easy Chat server version 1.2
* It is possible to crash the server by providing a very long username string. The string is not bounds checked and an overly long string will bring down the server.
* The program has no good checks on the users who enter free rooms. Therefore it's possible to add an arbitrarily large number of fake users to the system eventually causing it to crash.
The first issue can be tested using the following request:
GET /chat.ghp?username=aaaa[ 295 of a ]aaaa&password=&room=1&sex=0
The second can be tested by:
GET /chat.ghp?username=FakeUser&password=&room=1&sex=0
Which will create a fake user on the system with the provided password. Naturally, issuing many such requests with bogus (perhaps random) usernames will eventually cause the server to crash.
Vendor Status:
The vendor has been contacted and a fix will be out in the next version of the product.
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