==================================================================== CERT-Renater Note d'Information No. 2016/VULN109 _____________________________________________________________________ DATE : 10/03/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Microsoft Office, Microsoft Office Compatibility Pack, Microsoft Word Viewer, Microsoft Office Services and Web Apps, Microsoft SharePoint Server, Microsoft Office Web Apps. ====================================================================== KB3141806 https://technet.microsoft.com/en-us/library/security/MS16-029 _____________________________________________________________________ Microsoft Security Bulletin MS16-029: Security Update for Microsoft Office to Address Remote Code Execution - Important (3141806) Bulletin Number: MS16-029 Bulletin Title: Security Update for Microsoft Office to Address Remote Code Execution Severity: Important KB Article: 3141806 Version: 1.0 Published Date: March 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 2007 Service Pack 3 (2956110) Microsoft InfoPath 2007 Service Pack 3 (3114426) Microsoft Word 2007 Service Pack 3 (3114901) Microsoft Office 2010 Microsoft Office 2010 Service Pack 2 (32-bit editions) (2956063) Microsoft Office 2010 Service Pack 2 (32-bit editions) (3114873) Microsoft Office 2010 Service Pack 2 (64-bit editions) (3114873) Microsoft InfoPath 2010 Service Pack 2 (32-bit editions) (3114414) Microsoft InfoPath 2010 Service Pack 2 (64-bit editions) (3114414) Microsoft Word 2010 Service Pack 2 (32-bit editions) (3114878) Microsoft Word 2010 Service Pack 2 (64-bit editions) (3114878) Microsoft Office 2013 Microsoft Office 2013 Service Pack 1 (32-bit editions) (3039746) Microsoft InfoPath 2013 Service Pack 1 (32-bit editions) (3114833) Microsoft InfoPath 2013 Service Pack 1 (64-bit editions) (3114833) Microsoft Word 2013 Service Pack 1 (32-bit editions) (3114824) Microsoft Word 2013 Service Pack 1 (64-bit editions) (3114824) Microsoft Office 2013 RT Microsoft Word 2013 RT Service Pack 1 (3114824)[1] Microsoft Office 2016 Microsoft Office 2016 (32-bit edition) (3114690) Microsoft Word 2016 (32-bit edition) (3114855) Microsoft Word 2016 (64-bit edition) (3114855) Microsoft Office for Mac 2011 Microsoft Word for Mac 2011 (3138328)[2] Microsoft Office 2016 for Mac Microsoft Word 2016 for Mac (3138327)[2] Other Office Software Microsoft Office Compatibility Pack Service Pack 3 (3114900) Microsoft Word Viewer(3114812) [1]This update is available via Windows Update. [2]The 3138328 update for Microsoft Office for Mac 2011 and the 3138327 update for Microsoft Office 2016 for Mac are not yet available. The updates will be released as soon as they are available and users will be notified via a bulletin revision. Microsoft Office Services and Web Apps Microsoft SharePoint Server 2010 Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 (3114866) Microsoft SharePoint Server 2013 Word Automation Services on Microsoft SharePoint Server 2013 Service Pack 1 (3114814) Microsoft Office Web Apps 2010 Microsoft Office Web Apps 2010 Service Pack 2 (3114880) Microsoft Office Web Apps 2013 Microsoft Web Apps Server 2013 Service Pack 1 (3114821) Vulnerability Information 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 Microsft Office software. Note that the Preview Pane is not an attack vector for these vulnerabilities. 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. The security update addresses the vulnerabilities by correcting how Office handles objects in memory. The following tables contain 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-2016-0021 No No Microsoft Office Memory Corruption Vulnerability CVE-2016-0134 No No Microsoft Office Security Feature Bypass Vulnerability - CVE-2016-0057 A security feature bypass vulnerability exists in Microsoft Office software due to an invalidly signed binary. An attacker who successfully exploited the vulnerability could use a similarly configured binary to host malicious code. A defender would then not be able to rely on a valid binary signature to differentiate between a known good and a malicious binary. To successfully exploit this vulnerability, an attacker would have to have write access to the target location that contains the invalidly signed binary. The attacker could then overwrite the original file with their own malicious file and wait for an application, or user, to trigger the malicious binary. The security update addresses the vulnerability by providing a validly signed binary. The following tables contain links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Microsoft Office Security Feature Bypass Vulnerability CVE-2016-0057 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 + ==========================================================