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AUSCERT External Security Bulletin Redistribution
ESB-2015.3060
MS15-125 Cumulative Security Update for Microsoft Edge (3116184)
9 December 2015
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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
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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.
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