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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2066 MS15-091 - Cumulative Security Update for Microsoft Edge (3084525) 12 August 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Edge Publisher: Microsoft Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-2449 CVE-2015-2446 CVE-2015-2442 CVE-2015-2441 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS15-091 - --------------------------BEGIN INCLUDED TEXT-------------------- MS15-091 - Cumulative Security Update for Microsoft Edge (3084525) Bulletin Number: MS15-091 Bulletin Title: Cumulative Security Update for Microsoft Edge Severity: Critical KB Article: 3084525 Version: 1.0 Published Date: August 11, 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 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 affected Windows clients. For more information, see the Affected Software section. Affected Software Windows 10 for 32-bit Systems[1] Windows 10 for x64-based Systems[1] [1]The Windows 10 update is cumulative. In addition to containing non-security updates, it also contains all of the security fixes for all of the Windows 10-affected vulnerabilities shipping with this months security release. The update is available via the Windows Update Catalog only. See Microsoft Knowledge Base Article 3081435 for more information and download links. Vulnerability Information Multiple 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 complete 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 Memory Corruption Vulnerability CVE-2015-2441 No No Memory Corruption Vulnerability CVE-2015-2442 No No Memory Corruption Vulnerability CVE-2015-2446 No No ASLR Bypass Vulnerability - CVE-2015-2449 A security feature bypass vulnerability 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 this vulnerability 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 vulnerability 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 vulnerability requires that a user is logged on and running an affected version of Microsoft Edge, and 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 vulnerability. 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 vulnerability by helping to ensure that affected versions of Microsoft Edge properly implement the ASLR security feature. - --------------------------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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