10 - USN-2833-1

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

- Ubuntu 15.10 - Ubuntu 15.04 - 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:

Andrei Vaida, Jesse Ruderman, Bob Clary, Christian Holler, Jesse Ruderman, Eric Rahm, Robert Kaiser, Harald Kirschner, and Michael Henretty 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 with the privileges of the user invoking Firefox. (CVE-2015-7201, CVE-2015-7202)

Ronald Crane discovered three buffer overflows through code inspection. 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 with the privileges of the user invoking Firefox. (CVE-2015-7203, CVE-2015-7220, CVE-2015-7221)

Cajus Pollmeier discovered a crash during javascript variable assignments 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 with the privileges of the user invoking Firefox. (CVE-2015-7204)

Ronald Crane discovered a buffer overflow through code inspection. 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-2015-7205)

It was discovered that it is possible to read cross-origin URLs following a redirect if performance.getEntries() is used with an iframe to host a page. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass same-origin restrictions. (CVE-2015-7207)

It was discovered that Firefox allows for control characters to be set in cookies. An attacker could potentially exploit this to conduct cookie injection attacks on some web servers. (CVE-2015-7208)

Looben Yang discovered a use-after-free in WebRTC when closing channels 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-2015-7210)

Abdulrahman Alqabandi discovered that hash symbol is incorrectly handled when parsing data: URLs. An attacker could potentially exploit this to conduct URL spoofing attacks. (CVE-2015-7211)

Abhishek Arya discovered an integer overflow when allocating large textures. 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-2015-7212)

Ronald Crane dicovered an integer overflow when processing MP4 format video 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-2015-7213)

Tsubasa Iinuma discovered a way to bypass same-origin restrictions using data: and view-source: URLs. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to obtain sensitive information and read local files. (CVE-2015-7214)

Masato Kinugawa discovered a cross-origin information leak in error events in web workers. An attacker could potentially exploit this to obtain sensitive information. (CVE-2015-7215)

Gustavo Grieco discovered that the file chooser crashed on malformed images due to flaws in the Jasper 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. (CVE-2015-7216, CVE-2015-7217)

Stuart Larsen discoverd two integer underflows when handling malformed HTTP/2 frames 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. (CVE-2015-7218, CVE-2015-7219)

Gerald Squelart discovered an integer underflow in the libstagefright library when parsing MP4 format video 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-2015-7222)

Kris Maglione discovered a mechanism where web content could use WebExtension APIs to execute code with the privileges of a particular WebExtension. If a user were tricked in to opening a specially crafted website with a vulnerable extension installed, an attacker could potentially exploit this to obtain sensitive information or conduct cross-site scripting (XSS) attacks. (CVE-2015-7223)

Update instructions:

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

Ubuntu 15.10:
firefox 43.0+build1-0ubuntu0.15.10.1

Ubuntu 15.04:
firefox 43.0+build1-0ubuntu0.15.04.1

Ubuntu 14.04 LTS:
firefox 43.0+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
firefox 43.0+build1-0ubuntu0.12.04.1

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

References:
http://www.ubuntu.com/usn/usn-2833-1
CVE-2015-7201, CVE-2015-7202, CVE-2015-7203, CVE-2015-7204,
CVE-2015-7205, CVE-2015-7207, CVE-2015-7208, CVE-2015-7210,
CVE-2015-7211, CVE-2015-7212, CVE-2015-7213, CVE-2015-7214,
CVE-2015-7215, CVE-2015-7216, CVE-2015-7217, CVE-2015-7218,
CVE-2015-7219, CVE-2015-7220, CVE-2015-7221, CVE-2015-7222,
CVE-2015-7223

Package Information:
https://launchpad.net/ubuntu/+source/firefox/43.0+build1-0ubuntu0.15.10.1
https://launchpad.net/ubuntu/+source/firefox/43.0+build1-0ubuntu0.15.04.1
https://launchpad.net/ubuntu/+source/firefox/43.0+build1-0ubuntu0.14.04.1
https://launchpad.net/ubuntu/+source/firefox/43.0+build1-0ubuntu0.12.04.1