==================================================================== CERT-Renater Note d'Information No. 2016/VULN158 _____________________________________________________________________ DATE : 13/04/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Internet Explorer versions 9, 10, 11. ====================================================================== KB3148531 https://technet.microsoft.com/en-us/library/security/MS16-037 _____________________________________________________________________ MS16-037 - Cumulative Security Update for Internet Explorer (3148531) Bulletin Number: MS16-037 Bulletin Title: Cumulative Security Update for Internet Explorer Severity: Critical KB Article: 3148531 Version: 1.0 Executive Summary This security update resolves vulnerabilities in Internet Explorer. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. 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 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. This security update is rated Critical for Internet Explorer 9 (IE 9), and Internet Explorer 11 (IE 11) on affected Windows clients, and Moderate for Internet Explorer 9 (IE 9), Internet Explorer 10 (IE 10), and Internet Explorer 11 (IE 11) on affected Windows servers. Affected Software Internet Explorer 9 Internet Explorer 10 Internet Explorer 11 Vulnerability Information Multiple Internet Explorer Memory Corruption Vulnerabilities Multiple remote code execution vulnerabilities exist when Internet Explorer improperly accesses objects in memory. These vulnerabilities could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker could host a specially crafted website that is designed to exploit these vulnerabilities through Internet Explorer, and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-generated content or advertisements, by adding specially crafted content that could exploit the vulnerabilities. In all cases, however, 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 an enticement in an email or Instant Messenger message, or by getting them to open an attachment sent through email. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker 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. The update addresses the vulnerabilities by modifying how Internet Explorer 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 Browser Memory Corruption Vulnerability CVE-2016-0154 No No Internet Explorer Memory Corruption Vulnerability CVE-2016-0159 No No Internet Explorer Memory Corruption Vulnerability CVE-2016-0164 No No Internet Explorer Memory Corruption Vulnerability CVE-2016-0166 No No DLL Loading Remote Code Execution Vulnerability - CVE-2016-0160 A remote code execution vulnerability exists when Internet Explorer improperly validates input before loading dynamic link library (DLL) files. An attacker who successfully exploited this vulnerability 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. 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. To exploit the vulnerability, an attacker would first have to log on to the target system and then run a specially crafted application. The updates address the vulnerability by correcting how Internet Explorer validates input before loading DLL 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 DLL Loading Remote Code Execution Vulnerability CVE-2016-0160 Yes No Internet Explorer Information Disclosure Vulnerability - CVE-2016-0162 An information disclosure vulnerability exists when Internet Explorer does not properly handle JavaScript. The vulnerability could allow an attacker to detect specific files on the user's computer. In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-generated content could contain specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince users to take action. For example, an attacker could trick users into clicking a link that takes them to the attacker's site. An attacker who successfully exploited the vulnerability could potentially read data that was not intended to be disclosed. Note that the vulnerability would not allow an attacker to execute code or to elevate a users rights directly, but the vulnerability could be used to obtain information in an attempt to further compromise the affected system. The update addresses the vulnerability by helping to restrict what information is returned to Internet Explorer. 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 Internet Explorer Information Disclosure Vulnerability CVE-2016-0162 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 + ==========================================================