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[USN-2936-3] Firefox regression

Posted on 19 May 2016
Ubuntu Security

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Ubuntu Security Notice USN-2936-3
May 19, 2016

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

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-2936-1 introduced a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-2936-1 fixed vulnerabilities in Firefox. The update caused an issue
where a device update POST request was sent every time about:preferences#=
sync
was shown. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Christian Holler, Tyson Smith, Phil Ringalda, Gary Kwong, Jesse Ruderman=
,
Mats Palmgren, Carsten Book, Boris Zbarsky, David Bolter, Randell Jesup,=

Andrew McCreight, and Steve Fink discovered multiple memory safety issue=
s
in Firefox. If a user were tricked in to opening a specially crafted
website, an attacker could potentially exploit these to cause a denial o=
f
service via application crash, or execute arbitrary code with the
privileges of the user invoking Firefox. (CVE-2016-2804, CVE-2016-2806,
CVE-2016-2807)
=20
An invalid write was discovered when using the JavaScript .watch() metho=
d in
some circumstances. If a user were tricked in to opening a specially cra=
fted
website, an attacker could potentially exploit this to cause a denial of=

service via application crash, or execute arbitrary code with the
privileges of the user invoking Firefox. (CVE-2016-2808)
=20
Looben Yang discovered a use-after-free and buffer overflow in service
workers. If a user were tricked in to opening a specially crafted websit=
e,
an attacker could potentially exploit these to cause a denial of service=

via application crash, or execute arbitrary code with the privileges of
the user invoking Firefox. (CVE-2016-2811, CVE-2016-2812)
=20
Sascha Just discovered a buffer overflow in libstagefright 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 with the
privileges of the user invoking Firefox. (CVE-2016-2814)
=20
Muneaki Nishimura discovered that CSP is not applied correctly to web
content sent with the multipart/x-mixed-replace MIME type. An attacker
could potentially exploit this to conduct cross-site scripting (XSS)
attacks when they would otherwise be prevented. (CVE-2016-2816)
=20
Muneaki Nishimura discovered that the chrome.tabs.update API for web
extensions allows for navigation to javascript: URLs. A malicious
extension could potentially exploit this to conduct cross-site scripting=

(XSS) attacks. (CVE-2016-2817)
=20
Mark Goodwin discovered that about:healthreport accepts certain events
from any content present in the remote-report iframe. If another
vulnerability allowed the injection of web content in the remote-report
iframe, an attacker could potentially exploit this to change the user's
sharing preferences. (CVE-2016-2820)

Update instructions:

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

Ubuntu 16.04 LTS:
firefox 46.0.1+build1-0ubuntu0.16.04.2

Ubuntu 15.10:
firefox 46.0.1+build1-0ubuntu0.15.10.2

Ubuntu 14.04 LTS:
firefox 46.0.1+build1-0ubuntu0.14.04.3

Ubuntu 12.04 LTS:
firefox 46.0.1+build1-0ubuntu0.12.04.2

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

References:
http://www.ubuntu.com/usn/usn-2936-3
http://www.ubuntu.com/usn/usn-2936-1
https://launchpad.net/bugs/1583389

Package Information:
https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.16.=
04.2
https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.15.=
10.2
https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.14.=
04.3
https://launchpad.net/ubuntu/+source/firefox/46.0.1+build1-0ubuntu0.12.=
04.2



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