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:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Firefox to make
all the necessary changes.