Mozilla Foundation Security Advisory 2018-20

Security vulnerabilities fixed in Firefox 62

Announced
September 5, 2018
Impact
critical
Products
Firefox
Fixed in
  • Firefox 62

#CVE-2018-12377: Use-after-free in refresh driver timers

Reporter
Nils
Impact
high
Description

A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash.

References

#CVE-2018-12378: Use-after-free in IndexedDB

Reporter
Zhanjia Song
Impact
high
Description

A use-after-free vulnerability can occur when an IndexedDB index is deleted while still in use by JavaScript code that is providing payload values to be stored. This results in a potentially exploitable crash.

References

#CVE-2018-12379: Out-of-bounds write with malicious MAR file

Reporter
Holger Fuhrmannek
Impact
moderate
Description

When the Mozilla Updater opens a MAR format file which contains a very long item filename, an out-of-bounds write can be triggered, leading to a potentially exploitable crash. This requires running the Mozilla Updater manually on the local system with the malicious MAR file in order to occur.

References

#CVE-2017-16541: Proxy bypass using automount and autofs

Reporter
Filippo Cavallarin
Impact
moderate
Description

Browser proxy settings can be bypassed by using the automount feature with autofs to create a mount point on the local file system. Content can be loaded from this mounted file system directly using a file: URI, bypassing configured proxy settings.
Note: this issue only affects OS X in default configurations. On Linux systems, autofs must be installed for the vulnerability to occur and Windows is not affected.

References

#CVE-2018-12381: Dragging and dropping Outlook email message results in page navigation

Reporter
Jana Squires
Impact
low
Description

Manually dragging and dropping an Outlook email message into the browser will trigger a page navigation when the message's mail columns are incorrectly interpreted as a URL.
Note: this issue only affects Windows operating systems with Outlook installed. Other operating systems are not affected.

References

#CVE-2018-12382: Addressbar spoofing with javascript URI on Firefox for Android

Reporter
Jordi Chancel
Impact
low
Description

The displayed addressbar URL can be spoofed on Firefox for Android using a javascript: URI in concert with JavaScript to insert text before the loaded domain name, scrolling the loaded domain out of view to the right. This can lead to user confusion.
This vulnerability only affects Firefox for Android.

References

#CVE-2018-12383: Setting a master password post-Firefox 58 does not delete unencrypted previously stored passwords

Reporter
Jurgen Gaeremyn
Impact
low
Description

If a user saved passwords before Firefox 58 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Firefox 58. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations.

References

#CVE-2018-12375: Memory safety bugs fixed in Firefox 62

Reporter
Mozilla developers and community
Impact
high
Description

Mozilla developers and community members Christian Holler, Looben Yang, Jesse Ruderman, Sebastian Hengst, Nicolas Grunbaum, and Gary Kwong reported memory safety bugs present in Firefox 61. 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.

References

#CVE-2018-12376: Memory safety bugs fixed in Firefox 62 and Firefox ESR 60.2

Reporter
Mozilla developers and community
Impact
critical
Description

Mozilla developers and community members Alex Gaynor, Boris Zbarsky, Christoph Diehl, Christian Holler, Jason Kratzer, Jed Davis, Tyson Smith, Bogdan Tara, Karl Tomlinson, Mats Palmgren, Nika Layzell, Ted Campbell, and Andrei Cristian Petcu reported memory safety bugs present in Firefox 61 and Firefox ESR 60.1. 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.

References