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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.3060 MS15-125 Cumulative Security Update for Microsoft Edge (3116184) 9 December 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Edge Publisher: Microsoft Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Increased Privileges -- Remote with User Interaction Cross-site Scripting -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-6176 CVE-2015-6170 CVE-2015-6169 CVE-2015-6168 CVE-2015-6161 CVE-2015-6159 CVE-2015-6158 CVE-2015-6155 CVE-2015-6154 CVE-2015-6153 CVE-2015-6151 CVE-2015-6148 CVE-2015-6142 CVE-2015-6140 CVE-2015-6139 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS15-125 - --------------------------BEGIN INCLUDED TEXT-------------------- MS15-125 Cumulative Security Update for Microsoft Edge (3116184) Document Metadata Bulletin Number: MS15-125 Bulletin Title: Cumulative Security Update for Microsoft Edge Severity: Critical KB Article: 3116184 Version: 1.0 Published Date: December 8, 2015 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 those who operate with administrative user rights. This security update is rated Critical for Microsoft Edge on Windows 10. For more information, see the Affected Software section. Affected Software Microsoft Edge Windows 10 for 32-bit Systems [1] Windows 10 for x64-based Systems [1] Windows 10 Version 1511 for 32-bit Systems [1] Windows 10 Version 1511 for x64-based Systems [1] [1] Windows 10 updates are cumulative. In addition to containing non-security updates, they also contain all of the security fixes for all of the Windows 10-affected vulnerabilities shipping with the monthly security release. The updates are available via the Microsoft Update Catalog. Vulnerability Information Multiple Microsoft Edge Memory Corruption Vulnerabilities Multiple remote code execution vulnerabilities exist when Microsoft Edge improperly accesses objects in memory. 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 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. The attacker could also take advantage of compromised websites and websites that accept or host user-provided 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 way of enticement in an email or Instant Messenger message, or by getting them to open an attachment sent through email. 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. The update addresses the vulnerabilities by modifying how Microsoft Edge 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-2015-6140 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6142 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6148 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6151 No No Microsoft Edge Memory Corruption Vulnerability CVE-2015-6153 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6154 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6155 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6158 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6159 No No Microsoft Edge Memory Corruption Vulnerability CVE-2015-6168 No No Microsoft Browser Elevation of Privilege Vulnerability CVE-2015-6139 An elevation of privilege vulnerability exists when Microsoft Edge does not properly enforce content types. An attacker who successfully exploited the vulnerability could run arbitrary script with elevated privileges. In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. 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. For example, an attacker could trick users into clicking a link that takes them to the attacker's site. An attacker who successfully exploited this vulnerability could elevate privileges in affected versions of Microsoft Edge. The update addresses the vulnerability by helping to ensure that Microsoft Edge properly enforces content types. Microsoft received information about this vulnerability through coordinated vulnerability disclosure. At the time this security bulletin was originally issued, Microsoft was unaware of any attack attempting to exploit this vulnerability. Microsoft Browser ASLR Bypass CVE-2015-6161 A security feature bypass exists when Microsoft Edge fails to use the Address Space Layout Randomization (ASLR) security feature, allowing an attacker to more reliably predict the memory offsets of specific instructions in a given call stack. An attacker who successfully exploited it could bypass the Address Space Layout Randomization (ASLR) security feature, which helps protect users from a broad class of vulnerabilities. The security feature bypass by itself does not allow arbitrary code execution. However, an attacker could use this ASLR bypass in conjunction with another vulnerability, such as a remote code execution vulnerability, to more reliably run arbitrary code on a target system. In a web-browsing scenario, successful exploitation of the ASLR bypass requires a user to be logged on and running an affected version of Microsoft Edge. The user would then need to browse to a specially crafted site. The update addresses the ASLR bypass by helping to ensure that Microsoft Edge properly implements the ASLR security feature. Microsoft received information about this bypass through coordinated disclosure. At the time this security bulletin was originally issued, Microsoft was unaware of any attack attempting to exploit this bypass. Microsoft Edge Spoofing Vulnerability CVE-2015-6169 A spoofing vulnerability exists when Microsoft Edge does not properly parse HTTP responses. An attacker who successfully exploited this vulnerability could trick a user by redirecting them to a specially crafted website. The specially crafted website could spoof content or be used as a pivot to chain an attack with other vulnerabilities in web services. To exploit the vulnerability, the user must click a specially crafted URL. In an email attack scenario, an attacker could send an email message containing the specially crafted URL to the user in an attempt to convince the user to click it. In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or Instant Messenger message, and then convince the user to interact with content on the website. The update addresses the vulnerability by correcting how Microsoft Edge parses HTTP responses. Microsoft received information about this vulnerability through coordinated vulnerability disclosure. At the time this security bulletin was originally issued, Microsoft was unaware of any attack attempting to exploit this vulnerability. Microsoft Browser Elevation of Privilege Vulnerability CVE-2015-6170 An elevation of privilege vulnerability exists when Microsoft Edge does not properly validate permissions under specific conditions, potentially allowing script to be run with elevated privileges. In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. 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. For example, an attacker could trick users into clicking a link that takes them to the attacker's site. An attacker who successfully exploited this vulnerability could elevate privileges in affected editions of Microsoft Edge. The update addresses the vulnerabilities by adding permission validations to Microsoft Edge. Microsoft received information about this vulnerability through coordinated vulnerability disclosure. At the time this security bulletin was originally issued, Microsoft was unaware of any attack attempting to exploit this vulnerability. Microsoft Edge XSS Filter Bypass Vulnerability CVE-2015-6176 An XSS filter bypass vulnerability exists in the way that Microsoft Edge disables an HTML attribute in otherwise appropriately filtered HTTP response data. The vulnerability could allow initially disabled scripts to run in the wrong security context, leading to information disclosure. An attacker could post on a website specially crafted content that is designed to exploit the vulnerability. The attacker would then have to convince the user to view the content on the affected website. If the user then browses to the website, the XSS filter disables HTML attributes in the specially crafted content, creating a condition that could allow malicious script to run in the wrong security context, leading to information disclosure. An attacker who successfully exploited the vulnerability could cause script to run on another user's system in the guise of a third-party website. Such script would run inside the browser when visiting the third-party website, and could take any action on the user's system that the third-party website was permitted to take. The vulnerability could only be exploited if the user clicked a hypertext link, either in an HTML email or if the user visited an attacker's website or a website containing content that is under the attackers control. The update addresses the vulnerability by preventing the XSS filter in Microsoft Edge from incorrectly disabling HTML attributes. Microsoft received information about this vulnerability through coordinated disclosure. At the time this security bulletin was originally issued, Microsoft was unaware of any attack attempting to exploit this vulnerability. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. 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