Microsoft: 0Day Exploit Targeting Word, Outlook
Microsoft warned today that attackers are exploiting a previously unknown security hole inMicrosoft Word that can be used to foist malicious code if users open a specially crafted text file, or merely preview the message in Microsoft Outlook.
In a notice published today, Microsoft advised:
“Microsoft is aware of a vulnerability affecting supported versions of Microsoft Word. At this time, we are aware of limited, targeted attacks directed at Microsoft Word 2010. The vulnerability could allow remote code execution if a user opens a specially crafted [rich text format] RTF file using an affected version of Microsoft Word, or previews or opens a specially crafted RTF email message in Microsoft Outlook while using Microsoft Word as the email viewer. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user.”
To be clear, Microsoft said the exploits it has seen so far attacking this vulnerability have targeted Word 2010 users, but according to Microsoft’s advisory the flaw is also present in Word 2003, 2007, 2013, Word Viewer and Office for Mac 2011.
Microsoft says it’s working on an official fix for the flaw, but that in the meantime affected users can apply a special Fix-It solution that disables the opening of RTF content in Microsoft Word. Microsoft notes that the vulnerability could be exploited via Outlook only when using Microsoft Word as the email viewer, but by default Word is the email reader in Microsoft Outlook 2007, Outlook 2010 and Outlook 2013.
Read email messages in plain text
Applies to: Outlook 2010
If you have security concerns about reading HTML-formatted messages, you can have Outlook display messages that you open in plain text. However, reading messages in plain text doesn’t provide complete protection against all email message hazards.
- Click the File tab.
- Click Options.
- Click Trust Center, and then click Trust Center Settings.
- Click E-mail Security.
- Under Read as Plain Text, select the Read all standard mail in plain text check box.
To include messages signed with a digital signature, select the Read all digitally signed mail in plain text check box.
NOTE If you want to view a plain text message in its original format, click the InfoBar, and choose either Display as HTML or Display as Rich Text.