[USN-3778-1] Firefox vulnerabilities

Chris Coulson chris.coulson at canonical.com
Wed Oct 3 14:52:18 UTC 2018

Ubuntu Security Notice USN-3778-1
October 03, 2018

firefox vulnerabilities

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS


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


A crash was discovered in TransportSecurityInfo used for SSL, which could
be triggered by data stored in the local cache directory. An attacker
could potentially exploit this in combination with another vulnerability
that allowed them to write data to the cache, to execute arbitrary code.

A type confusion bug was discovered in JavaScript. If a user were tricked
in to opening a specially crafted website, an attacker could exploit this
to cause a denial of service, or execute arbitrary code. (CVE-2018-12386)

It was discovered that the Array.prototype.push could leak memory
addresses to the calling function in some circumstances. An attacker could
exploit this in combination with another vulnerability to help execute
arbitrary code. (CVE-2018-12387)

Update instructions:

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

Ubuntu 18.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.14.04.2

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

  CVE-2018-12385, CVE-2018-12386, CVE-2018-12387

Package Information:

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