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Vulnerability of Microsoft Forefront Unified Access Gateway: five vulnerabilities

Synthesis of the vulnerability 

An attacker can use several vulnerabilities of Microsoft Forefront Unified Access Gateway, in order to create a Cross Site Scripting, to execute code, or to create a denial of service.
Vulnerable software: Forefront Unified Access Gateway, Microsoft IAG.
Severity of this announce: 3/4.
Number of vulnerabilities in this bulletin: 5.
Creation date: 12/10/2011.
Références of this computer vulnerability: 2544641, BID-49972, BID-49974, BID-49979, BID-49980, BID-49983, CVE-2011-1895, CVE-2011-1896, CVE-2011-1897, CVE-2011-1969, CVE-2011-2012, MS11-079, SA-20111012-0, VIGILANCE-VUL-11053.

Description of the vulnerability 

The Microsoft Forefront Unified Access Gateway product provides remote access features. It is impacted by five vulnerabilities.

An attacker can use a special HTTP query, which is split in two. Its second part can contain JavaScript code which is interpreted in the context of another web site. [severity:2/4; BID-49979, CVE-2011-1895]

An attacker can generate a Cross Site Scripting, in order to execute JavaScript code in the context of another web site. [severity:2/4; BID-49972, CVE-2011-1896]

An attacker can generate a Cross Site Scripting, in order to execute JavaScript code in the context of another web site. [severity:2/4; BID-49974, CVE-2011-1897]

The Forefront Unified Access Gateway server installs a Java applet on the computer of VPN clients. However, this applet contains a vulnerability which leads to code execution on the victim's computer. [severity:3/4; BID-49983, CVE-2011-1969, SA-20111012-0]

An attacker can use a special session cookie, in order to create a NULL pointer dereference error, which stops IIS. [severity:2/4; BID-49980, CVE-2011-2012]
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This threat note impacts software or systems such as Forefront Unified Access Gateway, Microsoft IAG.

Our Vigil@nce team determined that the severity of this cybersecurity note is important.

The trust level is of type confirmed by the editor, with an origin of document.

This bulletin is about 5 vulnerabilities.

An attacker with a expert ability can exploit this vulnerability note.

Solutions for this threat 

Microsoft Forefront Unified Access Gateway: patch.
A patch is available:
Microsoft Forefront Unified Access Gateway 2010
  http://www.microsoft.com/downloads/details.aspx?familyid=770ad8ba-4d9a-404e-9515-6ed1e41682df
Microsoft Forefront Unified Access Gateway 2010 Update 1
  http://www.microsoft.com/downloads/details.aspx?familyid=b0de8d20-9c25-41c0-9c02-d263b9ed22fa
Microsoft Forefront Unified Access Gateway 2010 Update 2
  http://www.microsoft.com/downloads/details.aspx?familyid=166bdfcb-5088-4471-9d51-a3071ac13b73
Microsoft Forefront Unified Access Gateway 2010 Service Pack 1
  http://www.microsoft.com/downloads/details.aspx?familyid=8b6ad2ae-e168-45d9-bd3f-5590e0cbd2b5
The Microsoft announce indicates workarounds.
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