N/A - USN-3124-1

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

- Ubuntu 16.10 - 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:

Christian Holler, Andrew McCreight, Dan Minor, Tyson Smith, Jon Coppeard, Jan-Ivar Bruaroey, Jesse Ruderman, Markus Stange, Olli Pettay, Ehsan Akhgari, Gary Kwong, Tooru Fujisawa, and Randell Jesup 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-2016-5289, CVE-2016-5290)

A same-origin policy bypass was discovered with local HTML files in some circumstances. An attacker could potentially exploit this to obtain sensitive information. (CVE-2016-5291)

A crash was discovered when parsing URLs in some circumstances. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to execute arbitrary code. (CVE-2016-5292)

A heap buffer-overflow was discovered in Cairo when processing SVG content. 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-2016-5296)

An error was discovered in argument length checking in Javascript. 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-2016-5297)

An integer overflow was discovered in the Expat library. 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-2016-9063)

It was discovered that addon updates failed to verify that the addon ID inside the signed package matched the ID of the addon being updated. An attacker that could perform a man-in-the-middle (MITM) attack could potentially exploit this to provide malicious addon updates. (CVE-2016-9064)

A buffer overflow was discovered in nsScriptLoadHandler. 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-2016-9066)

2 use-after-free bugs were discovered during DOM operations in some circumstances. 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-2016-9067, CVE-2016-9069)

A heap use-after-free was discovered during web animations 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-2016-9068)

It was discovered that a page loaded in to the sidebar through a bookmark could reference a privileged chrome window. An attacker could potentially exploit this to bypass same origin restrictions. (CVE-2016-9070)

An issue was discovered with Content Security Policy (CSP) in combination with HTTP to HTTPS redirection. An attacker could potentially exploit this to verify whether a site is within the user's browsing history. (CVE-2016-9071)

An issue was discovered with the windows.create() WebExtensions API. If a user were tricked in to installing a malicious extension, an attacker could potentially exploit this to escape the WebExtensions sandbox. (CVE-2016-9073)

It was discovered that WebExtensions can use the mozAddonManager API. An attacker could potentially exploit this to install additional extensions without user permission. (CVE-2016-9075)

It was discovered that element dropdown menus can cover location bar content when e10s is enabled. An attacker could potentially exploit this to conduct UI spoofing attacks. (CVE-2016-9076)

It was discovered that canvas allows the use of the feDisplacementMap filter on cross-origin images. An attacker could potentially exploit this to conduct timing attacks. (CVE-2016-9077)

Update instructions:

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

Ubuntu 16.10:
firefox 50.0+build2-0ubuntu0.16.10.2

Ubuntu 16.04 LTS:
firefox 50.0+build2-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
firefox 50.0+build2-0ubuntu0.14.04.2

Ubuntu 12.04 LTS:
firefox 50.0+build2-0ubuntu0.12.04.2

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

References:
http://www.ubuntu.com/usn/usn-3124-1
CVE-2016-5289, CVE-2016-5290, CVE-2016-5291, CVE-2016-5292,
CVE-2016-5296, CVE-2016-5297, CVE-2016-9063, CVE-2016-9064,
CVE-2016-9066, CVE-2016-9067, CVE-2016-9068, CVE-2016-9069,
CVE-2016-9070, CVE-2016-9071, CVE-2016-9073, CVE-2016-9075,
CVE-2016-9076, CVE-2016-9077

Package Information:
https://launchpad.net/ubuntu/+source/firefox/50.0+build2-0ubuntu0.16.10.2
https://launchpad.net/ubuntu/+source/firefox/50.0+build2-0ubuntu0.16.04.2
https://launchpad.net/ubuntu/+source/firefox/50.0+build2-0ubuntu0.14.04.2
https://launchpad.net/ubuntu/+source/firefox/50.0+build2-0ubuntu0.12.04.2