==========================================================================
Ubuntu Security Notice USN-3547-1
January 25, 2018

libtasn1-6 vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Libtasn1.

Software Description:
- libtasn1-6: Library to manage ASN.1 structures

Details:

It was discovered that Libtasn1 incorrectly handled certain files.
If a user were tricked into opening a crafted file, an attacker could
possibly use this to cause a denial of service. This issue only
affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-10790)

It was discovered that Libtasn1 incorrectly handled certain inputs.
An attacker could possibly use this to cause Libtasn1 to hang,
resulting in a denial of service. This issue only affected Ubuntu 16.04
LTS and Ubuntu 17.10. (CVE-2018-6003)

Update instructions:

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

Ubuntu 17.10:
  libtasn1-6                      4.12-2.1ubuntu0.1

Ubuntu 16.04 LTS:
  libtasn1-6                      4.7-3ubuntu0.16.04.3

Ubuntu 14.04 LTS:
  libtasn1-6                      3.4-3ubuntu0.6

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

References:
  https://www.ubuntu.com/usn/usn-3547-1
  CVE-2017-10790, CVE-2018-6003

Package Information:
  https://launchpad.net/ubuntu/+source/libtasn1-6/4.12-2.1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libtasn1-6/4.7-3ubuntu0.16.04.3
  https://launchpad.net/ubuntu/+source/libtasn1-6/3.4-3ubuntu0.6