Vulnerability identifier: #VU992

Vulnerability risk: High

CVSSv3.1: 4.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2016-3298

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The vulnerablity exists due to improper handling of objects in memory by the Internet Messaging API. A remote attacker can create a specially crafted content, trick the victim into opening it, bypass security restrictions and determine the existence of arbitrary files.

Successful exploitation of the vulnerability results in information disclosure on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Internet Explorer: 9 - 11

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External links
http://technet.microsoft.com/en-us/library/security/ms16-118
http://technet.microsoft.com/en-us/library/security/ms16-126

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.