Ubuntu 15.04 LTS USN-2656-1 High: Firefox Malicious Site Threats

ubuntu

July 9, 2015

Firefox could be made to crash or run programs as your login if it opened a malicious website.

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:

Karthikeyan Bhargavan discovered that NSS incorrectly handled state

transitions for the TLS state machine. If a remote attacker were able to

perform a man-in-the-middle attack, this flaw could be exploited to skip

the ServerKeyExchange message and remove the forward-secrecy property.

(CVE-2015-2721)

Looben Yan discovered 2 use-after-free issues when using XMLHttpRequest in

some circumstances. 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 with

the privileges of the user invoking Firefox. (CVE-2015-2722,

CVE-2015-2733)

Bob Clary, Christian Holler, Bobby Holley, Andrew McCreight, Terrence

Cole, Steve Fink, Mats Palmgren, Wes Kocher, Andreas Pehrson, To...

Read the Full Advisory

Topics Covered

security advisory high severity firefox ubuntu memory safety dos malicious website

Update Instructions

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

Ubuntu 15.04:
  firefox                         39.0+build5-0ubuntu0.15.04.1

Ubuntu 14.10:
  firefox                         39.0+build5-0ubuntu0.14.10.1

Ubuntu 14.04 LTS:
  firefox                         39.0+build5-0ubuntu0.14.04.1

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