10 - USN-2904-1

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