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:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2015-4497,

CVE-2015-4498

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