==================================================================== CERT-Renater Note d'Information No. 2016/VULN344 _____________________________________________________________________ DATE : 14/10/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Windows running Microsoft Graphics Component, Microsoft Office, Skype for Business, Silverlight, Microsoft Lync. ===================================================================== KB3192884 https://technet.microsoft.com/en-us/library/security/MS16-120 ____________________________________________________________________ Microsoft Security Bulletin MS16-120 - Critical Security Update for Microsoft Graphics Component (3192884) Published: October 11, 2016 Version: 1.0 Executive Summary This security update resolves vulnerabilities in Microsoft Windows, Microsoft Office, Skype for Business, Silverlight and Microsoft Lync. The most serious of these vulnerabilities could allow remote code execution if a user either visits a specially crafted website or opens a specially crafted document. 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. This security update is rated Critical for: - - All supported releases of Microsoft Windows This security update is rated Important for: - - Affected editions of Microsoft Office 2007 and Microsoft Office 2010 - - Affected editions of Skype for Business 2016, Microsoft Lync 2013, and Microsoft Lync 2010 - - Affected editions of Microsoft .NET Framework - - Affected editions of Silverlight The security update addresses the vulnerabilities by correcting how the Windows font library handles embedded fonts. Affected Software Microsoft Windows Microsoft .NET Framework Microsoft Office 2007 Microsoft Office 2010 Microsoft Word Viewer Skype for Business 2016 Microsoft Lync 2013 Microsoft Lync 2010 Microsoft Live Meeting 2007 Console Microsoft Silverlight 5 Microsoft Silverlight 5 Developer Runtime Vulnerability Information Windows Graphics Component RCE Vulnerability CVE-2016-3393 A remote code execution vulnerability exists due to the way the Windows GDI component handles objects in the memory. An attacker who successfully exploited this vulnerability 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. There are multiple ways an attacker could exploit this vulnerability: - - In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit this vulnerability and then convince a user to view the website. An attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email message or in an Instant Messenger message that takes users to the attacker's website, or by opening an attachment sent through email. - - In a file sharing attack scenario, an attacker could provide a specially crafted document file that is designed to exploit this vulnerability, and then convince a user to open the document file. The security update addresses the vulnerability by correcting how the Windows GDI handles objects in the memory. The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited GDI+ Remote Code Execution Vulnerability CVE-2016-3393 No Yes GDI+ Remote Code Execution Vulnerability CVE-2016-3396 A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted embedded fonts. An attacker who successfully exploits this vulnerability 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. There are multiple ways an attacker could exploit the vulnerability: - - In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability and then convince users to view the website. An attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email or Instant Messenger message that takes users to the attacker's website, or by opening an attachment sent through email. - - In a file sharing attack scenario, an attacker could provide a specially crafted document file that is designed to exploit the vulnerability, and then convince users to open the document file. The security update addresses the vulnerability by correcting how the Windows font library handles embedded fonts. In the Affected Software and Vulnerability Severity Ratings table for Microsoft Office, the Preview Pane is an attack vector for CVE-2016-3396. The security update addresses the vulnerability by correcting how the Windows font library handles embedded fonts. The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited GDI+ Remote Code Execution Vulnerability CVE-2016-3396 No No Multiple GDI+ Information Disclosure Vulnerabilities Multiple information disclosure vulnerabilities exist in the way that the Windows Graphics Device Interface (GDI) handles objects in memory, allowing an attacker to retrieve information from a targeted system. An attacker who successfully exploited these vulnerabilities could use the retrieved information to circumvent Address Space Layout Randomization (ASLR) in Windows, which helps guard against a broad class of vulnerabilities. By itself, the information disclosures do not allow arbitrary code execution; however, they could allow arbitrary code to be run if the attacker uses one in combination with another vulnerability, such as a remote code execution vulnerability, that can leverage the ASLR circumvention. To exploit these vulnerabilities, an attacker would have to log on to an affected system and run a specially crafted application. The security update addresses the vulnerabilities, and helps protect the integrity of the ASLR security feature, by correcting how GDI handles memory addresses. The following table contains links to the standard entry for the vulnerabilities in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited GDI+ Information Disclosure Vulnerability CVE-2016-3209 No No GDI+ Information Disclosure Vulnerability CVE-2016-3262 No No GDI+ Information Disclosure Vulnerability CVE-2016-3263 No No True Type Font Parsing Elevation of Privilege Vulnerability CVE-2016-7182 An elevation of privilege vulnerability exists when the Windows Graphics Component improperly handles objects in memory. An attacker who successfully exploits this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The update addresses the vulnerability by correcting the way in which the Microsoft Graphics Component handles objects in memory, preventing unintended elevation from usermode. The following table contains links to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited True Type Font Parsing Elevation of Privilege Vulnerability CVE-2016-7182 No No True Type Font Parsing Elevation of Privilege Vulnerability CVE-2016-7182 An elevation of privilege vulnerability exists when the Windows Graphics Component improperly handles objects in memory. An attacker who successfully exploits this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. The update addresses the vulnerability by correcting the way in which the Microsoft Graphics Component handles objects in memory, preventing unintended elevation from usermode. The following table contains links to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited True Type Font Parsing Elevation of Privilege Vulnerability CVE-2016-7182 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 + ==========================================================