==================================================================== CERT-Renater Note d'Information No. 2016/VULN249 _____________________________________________________________________ DATE : 15/06/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Microsoft Edge. ====================================================================== KB3163656 https://technet.microsoft.com/en-us/library/security/MS16-068 ____________________________________________________________________ MS16-068 - Cumulative Security Update for Microsoft Edge (3163656) Executive Summary This security update resolves vulnerabilities in Microsoft Edge. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Microsoft Edge. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than users with administrative user rights. This security update is rated Critical for Microsoft Edge on Windows 10. Affected Software Microsoft Edge Vulnerability Information Microsoft Edge Security Feature Bypass - CVE-2016-3198 A security feature bypass exists in Microsoft Edge when the Edge Content Security Policy (CSP) fails to properly validate certain specially crafted documents. An attacker who exploited the bypass could trick a user into loading a page containing malicious content. To exploit the bypass, an attacker must trick a user into either loading a page containing malicious content or visiting a malicious website. The attacker could also inject the malicious page into either a compromised website or an advertisement network. The update addresses the bypass by correcting how the Edge CSP validates documents. 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 Edge Security Feature Bypass CVE-2016-3198 No No Multiple Scripting Engine Memory Corruption Vulnerabilities Multiple remote code execution vulnerabilities exist in the way that the Chakra JavaScript engine renders when handling objects in memory in Microsoft Edge. The vulnerabilities could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerabilities could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerabilities through Microsoft Edge and then convince a user to view the website. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the Edge rendering engine. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerabilities. The update addresses the vulnerabilities by modifying how the Chakra JavaScript scripting engine 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 Scripting Engine Memory Corruption Vulnerability CVE-2016-3199 No No Scripting Engine Memory Corruption Vulnerability CVE-2016-3202 No No Scripting Engine Memory Corruption Vulnerability CVE-2016-3214 No No Microsoft Edge Memory Corruption Vulnerability CVE-2016-3222 Yes No Multiple Windows PDF Information Disclosure Vulnerabilities Information disclosure vulnerabilities exist in Microsoft Windows when a user opens a specially crafted .pdf file. An attacker who successfully exploited the vulnerabilities could read information in the context of the current user. To exploit the vulnerabilities, an attacker would have to trick the user into opening the .pdf file. The update addresses the vulnerabilities by modifying how Windows parses .pdf files. 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 Windows PDF Information Disclosure Vulnerability CVE-2016-3201 No No Windows PDF Information Disclosure Vulnerability CVE-2016-3215 No No Windows PDF Remote Code Execution Vulnerability - CVE-2016-3203 A remote code execution vulnerability exists in Microsoft Windows if a user opens a specially crafted .pdf file. An attacker who successfully exploited the vulnerability could cause arbitrary code to execute in the context of the current user. To exploit the vulnerability, an attacker must entice the user to open a specially crafted .pdf file. The update addresses the vulnerabilities by modifying how Windows parses .pdf files. 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 Windows PDF Remote Code Execution Vulnerability CVE-2016-3203 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 + ==========================================================