N/A - USN-3076-1

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:

Atte Kettunen discovered an out-of-bounds read when handling certain Content Security Policy (CSP) directives 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. (CVE-2016-2827)

Christoph Diehl, Christian Holler, Gary Kwong, Nathan Froyd, Honza Bambas, Seth Fowler, Michael Smith, Andrew McCreight, Dan Minor, Byron Campen, Jon Coppeard, Steve Fink, Tyson Smith, and Carsten Book 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-2016-5256, CVE-2016-5257)

Atte Kettunen discovered a heap buffer overflow during text conversion with some unicode characters. 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-2016-5270)

Abhishek Arya discovered an out of bounds read during the processing of text runs 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. (CVE-2016-5271)

Abhishek Arya discovered a bad cast when processing layout with input 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-2016-5272)

A crash was discovered in accessibility. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to execute arbitrary code. (CVE-2016-5273)

A use-after-free was discovered in web animations during restyling. 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-2016-5274)

A buffer overflow was discovered when working with empty filters during canvas 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-2016-5275)

A use-after-free was discovered in accessibility. 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-2016-5276)

A use-after-free was discovered in web animations when destroying a timeline. 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-2016-5277)

A buffer overflow was discovered when encoding image frames to images 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-2016-5278)

Rafael Gieschke discovered that the full path of files is available to web pages after a drag and drop operation. An attacker could potentially exploit this to obtain sensitive information. (CVE-2016-5279)

Mei Wang discovered a use-after-free when changing text direction. 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-2016-5280)

Brian Carpenter discovered a use-after-free when manipulating 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-2016-5281)

Richard Newman discovered that favicons can be loaded through non-whitelisted protocols, such as jar:. (CVE-2016-5282)

Gavin Sharp discovered a timing attack vulnerability involving document resizes and link colours. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information. (CVE-2016-5283)

An issue was discovered with the preloaded Public Key Pinning (HPKP). If a man-in-the-middle (MITM) attacker was able to obtain a fraudulent certificate for a Mozilla site, they could exploit this by providing malicious addon updates. (CVE-2016-5284)

Update instructions:

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

Ubuntu 16.04 LTS:
firefox 49.0+build4-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
firefox 49.0+build4-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
firefox 49.0+build4-0ubuntu0.12.04.1

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

References:
http://www.ubuntu.com/usn/usn-3076-1
CVE-2016-2827, CVE-2016-5256, CVE-2016-5257, CVE-2016-5270,
CVE-2016-5271, CVE-2016-5272, CVE-2016-5273, CVE-2016-5274,
CVE-2016-5275, CVE-2016-5276, CVE-2016-5277, CVE-2016-5278,
CVE-2016-5279, CVE-2016-5280, CVE-2016-5281, CVE-2016-5282,
CVE-2016-5283, CVE-2016-5284

Package Information:
https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.14.04.1
https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.12.04.1