The following updates has been released for Ubuntu Linux:

USN-3477-3: Firefox regressions
USN-3490-1: Thunderbird vulnerabilities

USN-3477-3: Firefox regressions

==========================================================================
Ubuntu Security Notice USN-3477-3
December 01, 2017

firefox regressions
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-3477-1 caused some minor regressions in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3477-1 fixed vulnerabilities in Firefox. The update introduced various
minor regressions. This update fixes the problems.

We apologize for the inconvenience.

Original advisory details:

Multiple security 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, read uninitialized
memory, obtain sensitive information, bypass same-origin restrictions,
bypass CSP protections, bypass mixed content blocking, spoof the
addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827,
CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833,
CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842)

It was discovered that javascript: URLs pasted in to the addressbar
would be executed instead of being blocked in some circumstances. If a
user were tricked in to copying a specially crafted URL in to the
addressbar, an attacker could potentially exploit this to conduct
cross-site scripting (XSS) attacks. (CVE-2017-7839)

It was discovered that exported bookmarks do not strip script elements
from user-supplied tags. If a user were tricked in to adding specially
crafted tags to bookmarks, exporting them and then opening the resulting
HTML file, an attacker could potentially exploit this to conduct
cross-site scripting (XSS) attacks. (CVE-2017-7840)

Update instructions:

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

Ubuntu 17.10:
firefox 57.0.1+build2-0ubuntu0.17.10.1

Ubuntu 17.04:
firefox 57.0.1+build2-0ubuntu0.17.04.1

Ubuntu 16.04 LTS:
firefox 57.0.1+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
firefox 57.0.1+build2-0ubuntu0.14.04.1

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

References:
https://www.ubuntu.com/usn/usn-3477-3
https://www.ubuntu.com/usn/usn-3477-1
https://launchpad.net/bugs/1735801

Package Information:
https://launchpad.net/ubuntu/+source/firefox/57.0.1+build2-0ubuntu0.17.10.1
https://launchpad.net/ubuntu/+source/firefox/57.0.1+build2-0ubuntu0.17.04.1
https://launchpad.net/ubuntu/+source/firefox/57.0.1+build2-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/firefox/57.0.1+build2-0ubuntu0.14.04.1

USN-3490-1: Thunderbird vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3490-1
December 01, 2017

thunderbird vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Thunderbird.

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

Details:

Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing-like
context, an attacker could potentially exploit these to bypass same-origin
restrictions, cause a denial of service via application crash, or execute
arbitrary code. (CVE-2017-7826, CVE-2017-7828, CVE-2017-7830)

Update instructions:

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

Ubuntu 17.10:
thunderbird 1:52.5.0+build1-0ubuntu0.17.10.1

Ubuntu 17.04:
thunderbird 1:52.5.0+build1-0ubuntu0.17.04.1

Ubuntu 16.04 LTS:
thunderbird 1:52.5.0+build1-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
thunderbird 1:52.5.0+build1-0ubuntu0.14.04.1

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

References:
https://www.ubuntu.com/usn/usn-3490-1
CVE-2017-7826, CVE-2017-7828, CVE-2017-7830

Package Information:
https://launchpad.net/ubuntu/+source/thunderbird/1:52.5.0+build1-0ubuntu0.17.10.1
https://launchpad.net/ubuntu/+source/thunderbird/1:52.5.0+build1-0ubuntu0.17.04.1
https://launchpad.net/ubuntu/+source/thunderbird/1:52.5.0+build1-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/thunderbird/1:52.5.0+build1-0ubuntu0.14.04.1