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Vulnerability of Microsoft Lync: Cross Site Scripting of Join Meeting

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting in the Join Meeting feature of Microsoft Lync, in order to execute JavaScript code in the context of the web site.
Impacted systems: Lync.
Severity of this alert: 2/4.
Creation date: 10/06/2014.
Références of this alert: 2969258, CERTFR-2014-AVI-263, CVE-2014-1823, MS14-032, VIGILANCE-VUL-14873.

Description of the vulnerability 

The Microsoft Lync product offers a web service.

However, it does not filter received data during a Join Meeting operation before inserting them in generated HTML documents.

An attacker can therefore trigger a Cross Site Scripting in the Join Meeting feature of Microsoft Lync, in order to execute JavaScript code in the context of the web site.
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This computer vulnerability bulletin impacts software or systems such as Lync.

Our Vigil@nce team determined that the severity of this vulnerability bulletin 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 threat note.

Solutions for this threat 

Microsoft Lync: patch for Join Meeting.
A patch is available in information sources.
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