The following security updates has been released for Ubuntu Linux:

USN-3639-1: LibRaw vulnerabilities
USN-3640-1: WebKitGTK+ vulnerability

USN-3639-1: LibRaw vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3639-1
May 08, 2018

libraw vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LibRaw.

Software Description:
- libraw: raw image decoder library

Details:

It was discovered that LibRaw incorrectly handled certain files.
An attacker could possibly use this to execute arbitrary code.
(CVE-2018-10528)

It was discovered that LibRaw incorrectly handled certain files.
An attacker could possibly use this to obtain sensitive information.
(CVE-2018-10529)

Update instructions:

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

Ubuntu 18.04 LTS:
  libraw16 0.18.8-1ubuntu0.1

Ubuntu 17.10:
  libraw16 0.18.2-2ubuntu0.3

Ubuntu 16.04 LTS:
  libraw15 0.17.1-1ubuntu0.3

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

References:
  https://usn.ubuntu.com/usn/usn-3639-1
  CVE-2018-10528, CVE-2018-10529

Package Information:
  https://launchpad.net/ubuntu/+source/libraw/0.18.8-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libraw/0.18.2-2ubuntu0.3
  https://launchpad.net/ubuntu/+source/libraw/0.17.1-1ubuntu0.3

USN-3640-1: WebKitGTK+ vulnerability

==========================================================================
Ubuntu Security Notice USN-3640-1
May 08, 2018

webkit2gtk vulnerability
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS

Summary:

A security issue was fixed in WebKitGTK+.

Software Description:
- webkit2gtk: Web content engine library for GTK+

Details:

Ivan Fratric discovered that WebKitGTK+ incorrectly handled certain web
content. If a user were tricked into viewing a malicious website, a remote
attacker could possibly exploit this to execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
libjavascriptcoregtk-4.0-18 2.20.2-0ubuntu0.18.04.1
libwebkit2gtk-4.0-37 2.20.2-0ubuntu0.18.04.1

Ubuntu 17.10:
libjavascriptcoregtk-4.0-18 2.20.2-0ubuntu0.17.10.1
libwebkit2gtk-4.0-37 2.20.2-0ubuntu0.17.10.1

Ubuntu 16.04 LTS:
libjavascriptcoregtk-4.0-18 2.20.2-0ubuntu0.16.04.1
libwebkit2gtk-4.0-37 2.20.2-0ubuntu0.16.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use WebKitGTK+, such as Epiphany, to make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3640-1
CVE-2018-4200

Package Information:
https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.2-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.2-0ubuntu0.17.10.1
https://launchpad.net/ubuntu/+source/webkit2gtk/2.20.2-0ubuntu0.16.04.1