USN-2723-1: Firefox vulnerabilities

Ubuntu Security Notice USN-2723-1

27th August, 2015

firefox vulnerabilities

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

• 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

A use-after-free was discovered when resizing a canvas element during
restyling 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-2015-4497)

Bas Venis discovered that the addon install permission prompt could be
bypassed using data: URLs in some circumstances. It was also discovered
that the installation notification could be made to appear over another
site. If a user were tricked in to opening a specially crafted website, an
attacker could potentially exploit this to install a malicious addon.
(CVE-2015-4498)

Update instructions

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

Ubuntu 15.04:

firefox 40.0.3+build1-0ubuntu0.15.04.1

Ubuntu 14.04 LTS:

firefox 40.0.3+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:

firefox 40.0.3+build1-0ubuntu0.12.04.1

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

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

References

CVE-2015-4497, CVE-2015-4498

from Ubuntu Security Notices http://ift.tt/1JyXGU0