Microsoft has released a security bulletin waring users about a zero-day vulnerability which may be affecting Microsoft Word. Microsoft further states that there are “limited, targeted attacks directed at Microsoft Word 2010.” If exploited, this vulnerability (CVE-2014-1761) could allow a remote attacker to execute commands remotely via specially crafted files and email messages.
Microsoft has also released preliminary details of the vulnerability and the exploit code. The vulnerability is exploited if a user opens an RTF file in Microsoft Word or previews or opens an RTF email message in Microsoft Outlook using Microsoft Word as the email viewer. It should be noted that Microsoft Word is the default email reader for Microsoft Outlook 2007, Microsoft Outlook 2010, and Microsoft Outlook 2013.
There are several workarounds which has been published Microsoft’s initial bulletin, including disabling opening of RTF files and enforcing Word to always open said type of file in Protected View. A fixtool has also been made available to help address the vulnerability while permanent solution is delivered by the firm.