[USN-1729-2] Firefox regression

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==========================================================================
Ubuntu Security Notice USN-1729-2
March 01, 2013

firefox regression
==========================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10

Summary:

Due to a regression, Firefox might crash or freeze under normal use.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-1729-1 fixed vulnerabilities in Firefox. This update introduced a
regression which sometimes resulted in freezes and crashes when using
multiple tabs with images displayed. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Olli Pettay, Christoph Diehl, Gary Kwong, Jesse Ruderman, Andrew McCreight,
Joe Drew, Wayne Mery, Alon Zakai, Christian Holler, Gary Kwong, Luke
Wagner, Terrence Cole, Timothy Nikkel, Bill McCloskey, and Nicolas Pierron
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.
(CVE-2013-0783, CVE-2013-0784)

Atte Kettunen discovered that Firefox could perform an out-of-bounds read
while rendering GIF format images. An attacker could exploit this to crash
Firefox. (CVE-2013-0772)

Boris Zbarsky discovered that Firefox did not properly handle some wrapped
WebIDL objects. If the user were tricked into opening a specially crafted
page, an attacker could possibly exploit this to cause a denial of service
via application crash, or potentially execute code with the privileges of
the user invoking Firefox. (CVE-2013-0765)

Bobby Holley discovered vulnerabilities in Chrome Object Wrappers (COW) and
System Only Wrappers (SOW). If a user were tricked into opening a specially
crafted page, a remote attacker could exploit this to bypass security
protections to obtain sensitive information or potentially execute code
with the privileges of the user invoking Firefox. (CVE-2013-0773)

Frederik Braun discovered that Firefox made the location of the active
browser profile available to JavaScript workers. (CVE-2013-0774)

A use-after-free vulnerability was discovered in Firefox. An attacker could
potentially exploit this to execute code with the privileges of the user
invoking Firefox. (CVE-2013-0775)

Michal Zalewski discovered that Firefox would not always show the correct
address when cancelling a proxy authentication prompt. A remote attacker
could exploit this to conduct URL spoofing and phishing attacks.
(CVE-2013-0776)

Abhishek Arya discovered several problems related to memory handling. 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-2013-0777, CVE-2013-0778, CVE-2013-0779, CVE-2013-0780,
CVE-2013-0781, CVE-2013-0782)

Update instructions:

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

Ubuntu 12.10:
firefox 19.0+build1-0ubuntu0.12.10.2

Ubuntu 12.04 LTS:
firefox 19.0+build1-0ubuntu0.12.04.2

Ubuntu 11.10:
firefox 19.0+build1-0ubuntu0.11.10.2

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

References:
http://www.ubuntu.com/usn/usn-1729-2
http://www.ubuntu.com/usn/usn-1729-1
https://launchpad.net/bugs/1134409

Package Information:
https://launchpad.net/ubuntu/+source/firefox/19.0+build1-0ubuntu0.12.10.2
https://launchpad.net/ubuntu/+source/firefox/19.0+build1-0ubuntu0.12.04.2
https://launchpad.net/ubuntu/+source/firefox/19.0+build1-0ubuntu0.11.10.2