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AUSCERT Security Bulletin
Security vulnerabilities fixed in Firefox 59
15 March 2018
AusCERT Security Bulletin Summary
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
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Read-only Data Access -- Remote with User Interaction
CVE Names: CVE-2018-5143 CVE-2018-5142 CVE-2018-5141
CVE-2018-5140 CVE-2018-5138 CVE-2018-5137
CVE-2018-5136 CVE-2018-5135 CVE-2018-5134
CVE-2018-5133 CVE-2018-5132 CVE-2018-5131
CVE-2018-5130 CVE-2018-5129 CVE-2018-5128
CVE-2018-5127 CVE-2018-5126 CVE-2018-5125
Member content until: Friday, April 13 2018
Revision History: March 15 2018: This bulletin erroneously listed Firefox
Extended Support Release as affected.
March 14 2018: Initial Release
Security vulnerabilities have been fixed in Firefox 59.
Mozilla has given the following information concerning these
CVE-2018-5127: Buffer overflow manipulating SVG animatedPathSegList
A buffer overflow can occur when manipulating the SVG animatedPathSegList
through script. This results in a potentially exploitable crash.
CVE-2018-5128: Use-after-free manipulating editor selection ranges
A use-after-free vulnerability can occur when manipulating elements, events,
and selection ranges during editor operations. This results in a potentially
CVE-2018-5129: Out-of-bounds write with malformed IPC messages
A lack of parameter validation on IPC messages results in a potential
out-of-bounds write through malformed IPC messages. This can potentially allow
for sandbox escape through memory corruption in the parent process.
CVE-2018-5130: Mismatched RTP payload type can trigger memory corruption
When packets with a mismatched RTP payload type are sent in WebRTC connections,
in some circumstances a potentially exploitable crash is triggered.
CVE-2018-5131: Fetch API improperly returns cached copies of no-store/no-cache
Under certain circumstances the fetch() API can return transient local copies
of resources that were sent with a no-store or no-cache cache header instead of
downloading a copy from the network as it should. This can result in previously
stored, locally cached data of a website being accessible to users if they
share a common profile while browsing.
CVE-2018-5132: WebExtension Find API can search privileged pages
The Find API for WebExtensions can search some privileged pages, such as
about:debugging, if these pages are open in a tab. This could allow a malicious
WebExtension to search for otherwise protected data if a user has it open.
CVE-2018-5133: Value of the app.support.baseURL preference is not properly
If the app.support.baseURL preference is changed by a malicious local program
to contain HTML and script content, this content is not sanitized. It will be
executed if a user loads chrome://browser/content/preferences/in-content/
preferences.xul directly in a tab and executes a search. This stored preference
is also executed whenever an EME video player plugin displays a CDM-disabled
message as a notification message.
CVE-2018-5134: WebExtensions may use view-source: URLs to bypass content
WebExtensions may use view-source: URLs to view local file: URL content, as
well as content stored in about:cache, bypassing restrictions that only allow
WebExtensions to view specific content.
CVE-2018-5135: WebExtension browserAction can inject scripts into unintended
WebExtensions can bypass normal restrictions in some circumstances and use
browser.tabs.executeScript to inject scripts into contexts where this should
not be allowed, such as pages from other WebExtensions or unprivileged about:
CVE-2018-5136: Same-origin policy violation with data: URL shared workers
A shared worker created from a data: URL in one tab can be shared by another
tab with a different origin, bypassing the same-origin policy.
CVE-2018-5137: Script content can access legacy extension
A legacy extension's non-contentaccessible, defined resources can be loaded by
an arbitrary web page through script. This script does this by using a
maliciously crafted path string to reference the resources.
Note: this vulnerability does not affect WebExtensions.
CVE-2018-5138: Android Custom Tab address spoofing through long domain names
A spoofing vulnerability can occur when a malicious site with an extremely long
domain name is opened in an Android Custom Tab (a browser panel inside another
app) and the default browser is Firefox for Android. This could allow an
attacker to spoof which page is actually loaded and in use.
Note: this issue only affects Firefox for Android. Other versions and operating
systems are unaffected.
CVE-2018-5140: Moz-icon images accessible to web content through moz-icon:
Image for moz-icons can be accessed through the moz-icon: protocol through
script in web content even when otherwise prohibited. This could allow for
information leakage of which applications are associated with specific MIME
types by a malicious page.
CVE-2018-5141: DOS attack through notifications Push API
A vulnerability in the notifications Push API where notifications can be sent
through service workers by web content without direct user interaction. This
could be used to open new tabs in a denial of service (DOS) attack or to
display unwanted content from arbitrary URLs to users.
CVE-2018-5142: Media Capture and Streams API permissions display incorrect
origin with data: and blob: URLs
If Media Capture and Streams API permission is requested from documents with
data: or blob: URLs, the permission notifications do not properly display the
originating domain. The notification states "Unknown protocol" as the
requestee, leading to user confusion about which site is asking for this
addressbar to protect users from cross-site scripting (XSS) attacks, but if a
and the script will execute. This could allow users to be socially engineered
to run an XSS attack against themselves.
CVE-2018-5126: Memory safety bugs fixed in Firefox 59
Mozilla developers and community members Calixte Denizet, Christian Holler,
Sebastian Hengst, Jason Kratzer, Tyson Smith, Ryan VanderMeulen, Noemi Erli,
Karl Tomlinson, Philipp, Gary Kwong, and Ronald Crane reported memory safety
bugs present in Firefox 58. Some of these bugs showed evidence of memory
corruption and we presume that with enough effort that some of these could be
exploited to run arbitrary code.
CVE-2018-5125: Memory safety bugs fixed in Firefox 59 and Firefox ESR 52.7
Mozilla developers and community members Bob Clary, Olli Pettay, Christian
Holler, Nils Ohlmeier, Randell Jesup, Tyson Smith, Ralph Giles, and Philipp
reported memory safety bugs present in Firefox 58 and Firefox ESR 52.6. Some of
these bugs showed evidence of memory corruption and we presume that with enough
effort that some of these could be exploited to run arbitrary code.
Mozilla recommends updating Firefox to version 59. 
 Security vulnerabilities fixed in Firefox 59
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