Updated libtirpc packages has been released for Ubuntu Linux:

USN-3759-1: libtirpc vulnerabilities
USN-3759-2: libtirpc vulnerabilities

USN-3759-1: libtirpc vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3759-1
September 05, 2018

libtirpc vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libtirpc.

Software Description:
- libtirpc: transport-independent RPC library - development files

Details:

Aldy Hernandez discovered that libtirpc incorrectly handled certain
inputs. An attacker could possibly use this issue to cause a denial of
service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04
LTS. (CVE-2016-4429)

It was discovered that libtirpc incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2018-14622)

It was discovered that libtirpc incorrectly handled certain strings.
An attacker could possibly use this issue to cause a denial of service.
This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2017-8779)

Update instructions:

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

Ubuntu 18.04 LTS:
  libtirpc-dev 0.2.5-1.2ubuntu0.1
  libtirpc1 0.2.5-1.2ubuntu0.1

Ubuntu 16.04 LTS:
  libtirpc-dev 0.2.5-1ubuntu0.1
  libtirpc1 0.2.5-1ubuntu0.1

Ubuntu 14.04 LTS:
  libtirpc-dev 0.2.2-5ubuntu2.1
  libtirpc1 0.2.2-5ubuntu2.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3759-1
  CVE-2016-4429, CVE-2017-8779, CVE-2018-14622

Package Information:
  https://launchpad.net/ubuntu/+source/libtirpc/0.2.5-1.2ubuntu0.1
  https://launchpad.net/ubuntu/+source/libtirpc/0.2.5-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libtirpc/0.2.2-5ubuntu2.1

USN-3759-2: libtirpc vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3759-2
September 05, 2018

libtirpc vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libtirpc.

Software Description:
- libtirpc: transport-independent RPC library - development files

Details:

USN-3759-1 fixed a vulnerability in libtirpc. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Aldy Hernandez discovered that libtirpc incorrectly handled certain
 inputs. An attacker could possibly use this issue to cause a denial of
 service. (CVE-2016-4429)

 It was discovered that libtirpc incorrectly handled certain inputs.
 An attacker could possibly use this issue to cause a denial of
 service. (CVE-2018-14622)

 It was discovered that libtirpc incorrectly handled certain strings.
 An attacker could possibly use this issue to cause a denial of
 service. (CVE-2017-8779)

Update instructions:

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

Ubuntu 12.04 ESM:
  libtirpc-dev 0.2.2-5ubuntu0.1
  libtirpc1 0.2.2-5ubuntu0.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3759-2
  https://usn.ubuntu.com/usn/usn-3759-1
  CVE-2016-4429, CVE-2017-8779, CVE-2018-14622