==================================================================== CERT-Renater Note d'Information No. 2016/VULN377 _____________________________________________________________________ DATE : 09/11/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Microsoft Office. ===================================================================== KB3199168 https://technet.microsoft.com/en-us/library/security/MS16-133 ____________________________________________________________________ Microsoft Security Bulletin MS16-133: Important Security Update for Microsoft Office (3199168) Severity: Important Version: 1.0 Published Date: November 8, 2016 Executive Summary This security update resolves vulnerabilities in Microsoft Office. The most severe of the vulnerabilities could allow remote code execution if a user opens a specially crafted Microsoft Office file. An attacker who successfully exploited the vulnerabilities could run arbitrary code in the context of the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights. 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 Vulnerability Information Microsoft Office Information Disclosure Vulnerability - CVE-2016-7233 An information disclosure vulnerability exists when Office or Word reads out of bound memory due to an uninitialized variable which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bounds memory. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. The security update addresses the vulnerability by properly initializing the variable. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Microsoft Office Information Disclosure Vulnerability CVE-2016-7233 No No Multiple Microsoft Office Memory Corruption Vulnerabilities Multiple remote code execution vulnerabilities exist in Microsoft Office software when the Office software fails to properly handle objects in memory. 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 vulnerabilities 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 vulnerabilities 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. Note that the Preview Pane is not an attack vector for these vulnerabilities. The security update addresses the vulnerabilities by correcting how Office handles objects in memory. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Microsoft Office Memory Corruption Vulnerability CVE-2016-7213 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7228 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7229 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7230 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7231 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7232 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7234 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7235 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7236 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-7245 No No Microsoft Office Denial of Service Vulnerability - CVE-2016-7244 A denial of service vulnerability exists when a specially crafted file is opened in Microsoft Office. An attacker who successfully exploited the vulnerability could cause Office to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate their user rights. For an attack to be successful, this vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office. In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted file to the user and by convincing the user to open the file. The update addresses the vulnerability by correcting how Microsoft Office handles objects in memory. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Microsoft Office Denial of Service Vulnerability CVE-2016-7244 No No ========================================================== 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 + ==========================================================