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Synthesis of the vulnerability 
An attacker can trigger a Cross Site Scripting of ASP.NET SignalR, in order to execute JavaScript code in the context of the web site.
Vulnerable software: IIS, .NET Framework, Visual Studio.
Severity of this announce: 2/4.
Creation date: 11/12/2013.
Références of this computer vulnerability: 2905244, BID-64093, CERTA-2013-AVI-669, CVE-2013-5042, MS13-103, VIGILANCE-VUL-13933.
Description of the vulnerability 
The ASP.NET SignalR library is used to establish a communication between a web browser and a web server, using JavaScript.
However, it does not filter received data before inserting them in generated HTML documents.
An attacker can therefore trigger a Cross Site Scripting of ASP.NET SignalR, in order to execute JavaScript code in the context of the web site. Full bulletin, software filtering, emails, fixes, ... (Request your free trial)
This threat impacts software or systems such as IIS, .NET Framework, Visual Studio.
Our Vigil@nce team determined that the severity of this computer threat is medium.
The trust level is of type confirmed by the editor, with an origin of document.
An attacker with a expert ability can exploit this cybersecurity bulletin.
Solutions for this threat 
ASP.NET SignalR: patch.
A patch is available in information sources.
The Microsoft announce indicates workarounds.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)
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