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vulnerability bulletin CVE-2011-1895 CVE-2011-1896 CVE-2011-1897

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.
Consequences of an intrusion: user access/rights, client access/rights, denial of service on service.
Attacker's origin: document.
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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