=========================================================================Ubuntu Security Notice USN-3044-1
August 05, 2016

firefox vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Firefox could be made to crash or run programs as your login if it
opened a malicious website.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

Gustavo Grieco discovered an out-of-bounds read during XML parsing in
some circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to cause a
denial of service via application crash, or obtain sensitive information.
(CVE-2016-0718)

Toni Huttunen discovered that once a favicon is requested from a site,
the remote server can keep the network connection open even after the page
is closed. A remote attacked could potentially exploit this to track
users, resulting in information disclosure. (CVE-2016-2830)

Christian Holler, Tyson Smith, Boris Zbarsky, Byron Campen, Julian Seward,
Carsten Book, Gary Kwong, Jesse Ruderman, Andrew McCreight, and Phil
Ringnalda discovered multiple memory safety issues in Firefox. If a user
were tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service via application
crash, or execute arbitrary code. (CVE-2016-2835, CVE-2016-2836)

A buffer overflow was discovered in the ClearKey Content Decryption
Module (CDM) during video playback. If a user were tricked in to opening
a specially crafted website, an attacker could potentially exploit this to
cause a denial of service via plugin process crash, or, in combination
with another vulnerability to escape the GMP sandbox, execute arbitrary
code. (CVE-2016-2837)

Atte Kettunen discovered a buffer overflow when rendering SVG content in
some circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to cause a
denial of service via application crash, or execute arbitrary code.
(CVE-2016-2838)

Bert Massop discovered a crash in Cairo with version 0.10 of FFmpeg. If a
user were tricked in to opening a specially crafted website, an attacker
could potentially exploit this to execute arbitrary code. (CVE-2016-2839)

Catalin Dumitru discovered that URLs of resources loaded after a
navigation start could be leaked to the following page via the Resource
Timing API. An attacker could potentially exploit this to obtain sensitive
information. (CVE-2016-5250)

Firas Salem discovered an issue with non-ASCII and emoji characters in
data: URLs. An attacker could potentially exploit this to spoof the
addressbar contents. (CVE-2016-5251)

Georg Koppen discovered a stack buffer underflow during 2D graphics
rendering in some circumstances. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
cause a denial of service via application crash, or execute arbitrary
code. (CVE-2016-5252)

Abhishek Arya discovered a use-after-free when the alt key is used with
top-level menus. If a user were tricked in to opening a specially crafted
website, an attacker could potentially exploit this to cause a denial of
service via application crash, or execute arbitrary code. (CVE-2016-5254)

Jukka Jylänki discovered a crash during garbage collection. If a user
were tricked in to opening a specially crafted website, an attacker could
potentially exploit this to execute arbitrary code. (CVE-2016-5255)

Looben Yang discovered a use-after-free in WebRTC. If a user were tricked
in to opening a specially crafted website, an attacker could potentially
exploit this to cause a denial of service via application crash, or
execute arbitrary code. (CVE-2016-5258)

Looben Yang discovered a use-after-free when working with nested sync
events in service workers. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
cause a denial of service via application crash, or execute arbitrary
code. (CVE-2016-5259)

Mike Kaply discovered that plain-text passwords can be stored in session
restore if an input field type is changed from "password" to "text" during
a session, leading to information disclosure. (CVE-2016-5260)

Samuel Groß discovered an integer overflow in WebSockets during data
buffering in some circumstances. If a user were tricked in to opening a
specially crafted website, an attacker could potentially exploit this to
cause a denial of service via application crash, or execute arbitrary
code. (CVE-2016-5261)

Nikita Arykov discovered that JavaScript event handlers on a 
element can execute in a sandboxed iframe without the allow-scripts flag
set. If a user were tricked in to opening a specially crafted website, an
attacker could potentially exploit this to conduct cross-site scripting
(XSS) attacks. (CVE-2016-5262)

A type confusion bug was discovered in display transformation during
rendering. If a user were tricked in to opening a specially crafted
website, an attacker could potentially exploit this to cause a denial of
service via application crash, or execute arbitrary code. (CVE-2016-5263)

A use-after-free was discovered when applying effects to SVG elements in
some circumstances. If a user were tricked in to opening a specially
crafted website, an attacker could potentially exploit this to cause a
denial of service via application crash, or execute arbitrary code.
(CVE-2016-5264)

Abdulrahman Alqabandi discovered a same-origin policy violation relating
to local HTML files and saved shortcut files. An attacker could
potentially exploit this to obtain sensitive information. (CVE-2016-5265)

Rafael Gieschke discovered an information disclosure issue related to
drag and drop. An attacker could potentially exploit this to obtain
sensitive information. (CVE-2016-5266)

A text injection issue was discovered with about: URLs. An attacker could
potentially exploit this to spoof internal error pages. (CVE-2016-5268)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
  firefox                         48.0+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  firefox                         48.0+build2-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  firefox                         48.0+build2-0ubuntu0.12.04.1

After a standard system update you need to restart Firefox to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-3044-1
  CVE-2016-0718, CVE-2016-2830, CVE-2016-2835, CVE-2016-2836,
  CVE-2016-2837, CVE-2016-2838, CVE-2016-2839, CVE-2016-5250,
  CVE-2016-5251, CVE-2016-5252, CVE-2016-5254, CVE-2016-5255,
  CVE-2016-5258, CVE-2016-5259, CVE-2016-5260, CVE-2016-5261,
  CVE-2016-5262, CVE-2016-5263, CVE-2016-5264, CVE-2016-5265,
  CVE-2016-5266, CVE-2016-5268

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/48.0+build2-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/firefox/48.0+build2-0ubuntu0.14.04.1
  https://launchpad.net/ubuntu/+source/firefox/48.0+build2-0ubuntu0.12.04.1