The following security updates has been released for Ubuntu Linux:

USN-3906-2: LibTIFF vulnerabilities
USN-3911-1: file vulnerabilities

USN-3906-2: LibTIFF vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3906-2
March 18, 2019

tiff vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

LibTIFF could be made to crash or run programs as your login if it
opened a specially crafted file.

Software Description:
- tiff: Tag Image File Format (TIFF) library

Details:

USN-3906-1 and USN-3864-1 fixed several vulnerabilities in LibTIFF.
This update provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 It was discovered that LibTIFF incorrectly handled certain malformed
 images. If a user or automated system were tricked into opening a
 specially crafted image, a remote attacker could crash the
 application, leading to a denial of service, or possibly execute
 arbitrary code with user privileges.

Update instructions:

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

Ubuntu 12.04 ESM:
  libtiff-tools 3.9.5-2ubuntu1.12
  libtiff4 3.9.5-2ubuntu1.12

In general, a standard system update will make all the necessary
changes.

References:
  https://usn.ubuntu.com/usn/usn-3906-2
  https://usn.ubuntu.com/usn/usn-3906-1
  CVE-2018-10779, CVE-2018-12900, CVE-2018-1710, CVE-2018-17100,
  CVE-2018-17101, CVE-2018-18557, CVE-2019-6128, CVE-2019-7663

USN-3911-1: file vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3911-1
March 18, 2019

file vulnerabilities
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in file.

Software Description:
- file: Tool to determine file types

Details:

It was discovered that file incorrectly handled certain malformed ELF
files. An attacker could use this issue to cause a denial of service, or
possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.10:
file 1:5.34-2ubuntu0.1
libmagic1 1:5.34-2ubuntu0.1

Ubuntu 18.04 LTS:
file 1:5.32-2ubuntu0.2
libmagic1 1:5.32-2ubuntu0.2

Ubuntu 16.04 LTS:
file 1:5.25-2ubuntu1.2
libmagic1 1:5.25-2ubuntu1.2

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3911-1
CVE-2019-8904, CVE-2019-8905, CVE-2019-8906, CVE-2019-8907

Package Information:
https://launchpad.net/ubuntu/+source/file/1:5.34-2ubuntu0.1
https://launchpad.net/ubuntu/+source/file/1:5.32-2ubuntu0.2
https://launchpad.net/ubuntu/+source/file/1:5.25-2ubuntu1.2