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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2794 MS15-113 Cumulative Security Update for Microsoft Edge (3104519) 11 November 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Edge Publisher: Microsoft Operating System: Windows 10 Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-6088 CVE-2015-6078 CVE-2015-6073 CVE-2015-6064 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS15-113 - --------------------------BEGIN INCLUDED TEXT-------------------- MS15-113 Cumulative Security Update for Microsoft Edge (3104519) Document Metadata Bulletin Number: MS15-113 Bulletin Title: Cumulative Security Update for Microsoft Edge Severity: Critical KB Article: 3104519 Version: 1.0 Published Date: November 10, 2015 Executive Summary This security update resolves vulnerabilities in Microsoft Edge. The more severe of these vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Microsoft Edge. An attacker who successfully exploited these 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 Remote code execution vulnerabilities exist when Microsoft Edge 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 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 these 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 getting them to click a link in an instant messenger or email message that takes users to the attacker's website, 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, an attacker who successfully exploited these 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. Systems where Microsoft Edge is used frequently, such as workstations or terminal servers, are at the most risk from these vulnerabilities. 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-2015-6064 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6073 No No Microsoft Browser Memory Corruption Vulnerability CVE-2015-6078 No No Microsoft Browser ASLR Bypass CVE-2015-6088 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 that a user is logged on and running an affected version of Microsoft Edge, and then browses to a malicious site. Therefore, any systems where a web browser is used frequently, such as workstations or terminal servers, are at the most risk from this ASLR bypass. Servers could be at more risk if administrators allow users to browse and read email on servers. However, best practices strongly discourage allowing this. The update addresses the ASLR bypass by helping to ensure that affected versions of Microsoft Edge properly implement the ASLR security feature. Microsoft received information about this bypass through coordinated bypass 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. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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