=========================================================================Ubuntu Security Notice USN-2973-1
May 19, 2016

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

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Thunderbird.

Software Description:
- thunderbird: Mozilla Open Source mail and newsgroup client

Details:

Christian Holler, Tyson Smith, and Phil Ringalda discovered multiple
memory safety issues in Thunderbird. If a user were tricked in to opening
a specially crafted message, an attacker could potentially exploit these
to cause a denial of service via application crash, or execute arbitrary
code. (CVE-2016-2805, CVE-2016-2807)

Hanno Böck discovered that calculations with mp_div and mp_exptmod in NSS
produce incorrect results in some circumstances, resulting in
cryptographic weaknesses. (CVE-2016-1938)

A use-after-free was discovered in ssl3_HandleECDHServerKeyExchange in
NSS. A remote attacker could potentially exploit this to cause a denial of
service via application crash, or execute arbitrary code. (CVE-2016-1978)

A use-after-free was discovered in PK11_ImportDERPrivateKeyInfoAndReturnKey
in NSS. A remote attacker could potentially exploit this to cause a denial
of service via application crash, or execute arbitrary code.
(CVE-2016-1979)

Update instructions:

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

Ubuntu 16.04 LTS:
  thunderbird                     1:38.8.0+build1-0ubuntu0.16.04.1

Ubuntu 15.10:
  thunderbird                     1:38.8.0+build1-0ubuntu0.15.10.1

Ubuntu 14.04 LTS:
  thunderbird                     1:38.8.0+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  thunderbird                     1:38.8.0+build1-0ubuntu0.12.04.1

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

References:
  https://ubuntu.com/security/notices/USN-2973-1
  CVE-2016-1938, CVE-2016-1978, CVE-2016-1979, CVE-2016-2805,
  CVE-2016-2807

Package Information:
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.8.0+build1-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.8.0+build1-0ubuntu0.15.10.1
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.8.0+build1-0ubuntu0.14.04.1
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.8.0+build1-0ubuntu0.12.04.1