============================================================================
Ubuntu Security Notice USN-1638-1
November 21, 2012

firefox vulnerabilities
============================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

Gary Kwong, Jesse Ruderman, Christian Holler, Bob Clary, Kyle Huey, Ed
Morley, Chris Lord, Boris Zbarsky, Julian Seward, Bill McCloskey, and
Andrew McCreight discovered multiple memory safety issues affecting
Firefox. If the user were tricked into opening a specially crafted page, an
attacker could possibly exploit these to cause a denial of service via
application crash, or potentially execute code with the privileges of the
user invoking Firefox. (CVE-2012-5842, CVE-2012-5843)

Atte Kettunen discovered a buffer overflow while rendering GIF format
images. An attacker could exploit this to possibly execute arbitrary code
as the user invoking Firefox. (CVE-2012-4202)

It was discovered that the evalInSandbox function's JavaScript sandbox
context could be circumvented. An attacker could exploit this to perform a
cross-site scripting (XSS) attack or steal a copy of a local file if the
user has installed an add-on vulnerable to this attack. With cross-site
scripting vulnerabilities, if a user were tricked into viewing a specially
crafted page, a remote attacker could exploit this to modify the contents,
or steal confidential data, within the same domain. (CVE-2012-4201)

Jonathan Stephens discovered that combining vectors involving the setting
of Cascading Style Sheets (CSS) properties in conjunction with SVG text
could cause Firefox to crash. If a user were tricked into opening a
malicious web page, an attacker could cause a denial of service via
application crash or execute arbitrary code with the privliges of the user
invoking the program. (CVE-2012-5836)

It was discovered that if a javascript: URL is selected from the list of
Firefox "new tab" page, the script will inherit the privileges of the
privileged "new tab" page. This allows for the execution of locally
installed programs if a user can be convinced to save a bookmark of a
malicious javascript: URL. (CVE-2012-4203)

Scott Bell discovered a memory corruption issue in the JavaScript engine.
If a user were tricked into opening a malicious website, an attacker could
exploit this to execute arbitrary JavaScript code within the context of
another website or arbitrary code as the user invoking the program.
(CVE-2012-4204)

Gabor Krizsanits discovered that XMLHttpRequest objects created within
sandboxes have the system principal instead of the sandbox principal. This
can lead to cross-site request forgery (CSRF) or information theft via an
add-on running untrusted code in a sandbox. (CVE-2012-4205)

Peter Van der Beken discovered XrayWrapper implementation in Firefox does
not consider the compartment during property filtering. An attacker could
use this to bypass intended chrome-only restrictions on reading DOM object
properties via a crafted web site. (CVE-2012-4208)

Bobby Holley discovered that cross-origin wrappers were allowing write
actions on objects when only read actions should have been properly
allowed. This can lead to cross-site scripting (XSS) attacks. With
cross-site scripting vulnerabilities, if a user were tricked into viewing a
specially crafted page, a remote attacker could exploit this to modify the
contents, or steal confidential data, within the same domain.
(CVE-2012-5841)

Masato Kinugawa discovered that when HZ-GB-2312 charset encoding is used
for text, the "~" character will destroy another character near the chunk
delimiter. This can lead to a cross-site scripting (XSS) attack in pages
encoded in HZ-GB-2312. With cross-site scripting vulnerabilities, if a user
were tricked into viewing a specially crafted page, a remote attacker could
exploit these to modify the contents, or steal confidential data, within
the same domain. (CVE-2012-4207)

Mariusz Mlynski discovered that the location property can be accessed by
binary plugins through top.location with a frame whose name attribute's
value is set to "top". This can allow for possible cross-site scripting
(XSS) attacks through plugins. With cross-site scripting vulnerabilities,
if a user were tricked into viewing a specially crafted page, a remote
attacker could exploit this to modify the contents, or steal confidential
data, within the same domain. (CVE-2012-4209)

Mariusz Mlynski discovered that when a maliciously crafted stylesheet is
inspected in the Style Inspector, HTML and CSS can run in a chrome
privileged context without being properly sanitized first. If a user were
tricked into opening a malicious web page, an attacker could execute
arbitrary code with the privliges of the user invoking the program.
(CVE-2012-4210)

Abhishek Arya discovered multiple use-after-free and buffer overflow issues
in Firefox. If a user were tricked into opening a malicious page, an
attacker could exploit these to execute arbitrary code as the user invoking
the program. (CVE-2012-4214, CVE-2012-4215, CVE-2012-4216, CVE-2012-5829,
CVE-2012-5839, CVE-2012-5840, CVE-2012-4212, CVE-2012-4213, CVE-2012-4217,
CVE-2012-4218)

Several memory corruption flaws were discovered in Firefox. If a user were
tricked into opening a malicious page, an attacker could exploit these to
execute arbitrary code as the user invoking the program. (CVE-2012-5830,
CVE-2012-5833, CVE-2012-5835, CVE-2012-5838)

Update instructions:

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

Ubuntu 12.10:
  firefox                         17.0+build2-0ubuntu0.12.10.1

Ubuntu 12.04 LTS:
  firefox                         17.0+build2-0ubuntu0.12.04.1

Ubuntu 11.10:
  firefox                         17.0+build2-0ubuntu0.11.10.1

Ubuntu 10.04 LTS:
  firefox                         17.0+build2-0ubuntu0.10.04.1

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

References:
  http://www.ubuntu.com/usn/usn-1638-1
  CVE-2012-4201, CVE-2012-4202, CVE-2012-4203, CVE-2012-4204,
  CVE-2012-4205, CVE-2012-4207, CVE-2012-4208, CVE-2012-4209,
  CVE-2012-4210, CVE-2012-4212, CVE-2012-4213, CVE-2012-4214,
  CVE-2012-4215, CVE-2012-4216, CVE-2012-4217, CVE-2012-4218,
  CVE-2012-5829, CVE-2012-5830, CVE-2012-5833, CVE-2012-5835,
  CVE-2012-5836, CVE-2012-5838, CVE-2012-5839, CVE-2012-5840,
  CVE-2012-5841, CVE-2012-5842, CVE-2012-5843, https://launchpad.net/bugs/1080211

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/17.0+build2-0ubuntu0.12.10.1
  https://launchpad.net/ubuntu/+source/firefox/17.0+build2-0ubuntu0.12.04.1
  https://launchpad.net/ubuntu/+source/firefox/17.0+build2-0ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/firefox/17.0+build2-0ubuntu0.10.04.1