USN-2723-1: Firefox vulnerabilities

Releases

• Ubuntu 15.04
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• 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 versions:

Ubuntu 15.04

• firefox - 40.0.3+build1-0ubuntu0.15.04.1

Ubuntu 14.04

• firefox - 40.0.3+build1-0ubuntu0.14.04.1

Ubuntu 12.04

• firefox - 40.0.3+build1-0ubuntu0.12.04.1

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

References

• CVE-2015-4497
• CVE-2015-4498