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Ubuntu Security Notice USN-2904-1
March 08, 2016

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

- 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:

Karthikeyan Bhargavan and Gaetan Leurent discovered that NSS incorrectly
allowed MD5 to be used for TLS 1.2 connections. If a remote attacker were
able to perform a man-in-the-middle attack, this flaw could be exploited to
view sensitive information. (CVE-2015-7575)

Yves Younan discovered that graphite2 incorrectly handled certain malformed
fonts. If a user were tricked into opening a specially crafted website in a
browsing context, an attacker could potentially exploit this to cause a
denial of service via application crash, or execute arbitary code with the
privileges of the user invoking Thunderbird. (CVE-2016-1523)

Bob Clary, Christian Holler, Nils Ohlmeier, Gary Kwong, Jesse Ruderman,
Carsten Book, and Randell Jesup discovered multiple memory safety issues
in Thunderbird. If a user were tricked in to opening a specially crafted
website in a browsing context, 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 Thunderbird. (CVE-2016-1930)

Aki Helin discovered a buffer overflow when rendering WebGL content in
some circumstances. If a user were tricked in to opening a specially
crafted website in a browsing context, 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
Thunderbird. (CVE-2016-1935)

Update instructions:

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

Ubuntu 15.10:
  thunderbird                     1:38.6.0+build1-0ubuntu0.15.10.1

Ubuntu 14.04 LTS:
  thunderbird                     1:38.6.0+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  thunderbird                     1:38.6.0+build1-0ubuntu0.12.04.1

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

References:
  http://www.ubuntu.com/usn/usn-2904-1
  CVE-2015-7575, CVE-2016-1523, CVE-2016-1930, CVE-2016-1935

Package Information:
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.6.0+build1-0ubuntu0.15.10.1
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.6.0+build1-0ubuntu0.14.04.1
  https://launchpad.net/ubuntu/+source/thunderbird/1:38.6.0+build1-0ubuntu0.12.04.1