==================================================================== CERT-Renater Note d'Information No. 2016/VULN345 _____________________________________________________________________ DATE : 14/10/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Microsoft Office. ===================================================================== KB3194063 https://technet.microsoft.com/en-us/library/security/MS16-121 ____________________________________________________________________ Microsoft Security Bulletin MS16-121 - Important Security Update for Microsoft Office (3194063) Published: October 11, 2016 Version: 1.0 Executive Summary This security update resolves a vulnerability in Microsoft Office. An Office RTF remote code execution vulnerability exists in Microsoft Office software when the Office software fails to properly handle RTF files. An attacker who successfully exploited the vulnerabilities could run arbitrary code in the context of the current user. The update addresses the vulnerability by changing the way Microsoft Office software handles RTF content. Affected Software Microsoft Office 2007 Microsoft Office 2010 Microsoft Office 2013 Microsoft Office 2013 RT Microsoft Office 2016 Microsoft Office for Mac 2011 Microsoft Office 2016 for Mac Microsoft Office Compatibility Pack Service Pack 3 Microsoft Word Viewer Microsoft SharePoint Server 2010 Microsoft SharePoint Server 2013 Microsoft Office Web Apps 2010 Microsoft Office Web Apps 2013 Office Online Server Vulnerability Information Microsoft Office Memory Corruption Vulnerability An Office RTF remote code execution vulnerability exists in Microsoft Office software when the Office software fails to properly handle RTF files. An attacker who successfully exploited the vulnerabilities could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerabilities. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince them to open the specially crafted file. The update addresses the vulnerability by changing the way Microsoft Office software handles RTF content. Microsoft received information about this vulnerability through coordinated vulnerability disclosure. Microsoft is aware of limited attacks that use this vulnerability in conjunction with other vulnerabilities to gain code execution. The following table contains the link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Microsoft Office Memory Corruption Vulnerability CVE-2016-7193 No Yes ========================================================== Serveur de référence du CERT-Renater https://services.renater.fr/ssi/ ========================================================== + CERT-RENATER | tel : 01-53-94-20-44 + + 23 - 25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email: cert@support.renater.fr + ==========================================================