Ubuntu: 3175-2 Critical: Resolve Firefox Regression Threat

ubuntu

February 6, 2017

USN-3175-1 introduced a regression in Firefox.

Summary

USN-3175-1 introduced a regression in Firefox.

Software Description:

- firefox: Mozilla Open Source web browser

Details:

USN-3175-1 fixed vulnerabilities in Firefox. The update caused a

regression on systems where the AppArmor profile for Firefox is set to

enforce mode. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Multiple memory safety issues were discovered in Firefox. If a user were

tricked in to opening a specially crafted website, an attacker could

potentially exploit these to cause a denial of service via application

crash, or execute arbitrary code. (CVE-2017-5373, CVE-2017-5374)

JIT code allocation can allow a bypass of ASLR protections 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. (CVE-2017-5375)

Nicolas Grégoire disc...

Read the Full Advisory

Topics Covered

security advisory firefox arbitrary code application crash ubuntu regression issue doS attack

Update Instructions

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

Ubuntu 16.10:
  firefox                         51.0.1+build2-0ubuntu0.16.10.2

Ubuntu 16.04 LTS:
  firefox                         51.0.1+build2-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  firefox                         51.0.1+build2-0ubuntu0.14.04.2

Ubuntu 12.04 LTS:
  firefox                         51.0.1+build2-0ubuntu0.12.04.2

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