The following updates has been released for Ubuntu Linux:

USN-4044-1: ZNC vulnerability
USN-4045-1: Thunderbird vulnerabilities

USN-4044-1: ZNC vulnerability

=========================================================================
Ubuntu Security Notice USN-4044-1
July 01, 2019

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

znc could be made to crash or run programs as an administrator
if it opened a specially crafted file.

Software Description:
- znc: advanced modular IRC bouncer

Details:

Fix vulnerability where an authenticated non-admin users could load
a module with a crafted name, then escalate privileges and run
arbitrary code.

Update instructions:

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

Ubuntu 19.04:
znc 1.7.2-2ubuntu0.1

Ubuntu 18.10:
znc 1.7.1-2ubuntu0.2

Ubuntu 18.04 LTS:
znc 1.6.6-1ubuntu0.2

Ubuntu 16.04 LTS:
znc 1.6.3-1ubuntu0.2

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

References:
https://usn.ubuntu.com/4044-1
CVE-2019-12816

Package Information:
https://launchpad.net/ubuntu/+source/znc/1.7.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/znc/1.7.1-2ubuntu0.2
https://launchpad.net/ubuntu/+source/znc/1.6.6-1ubuntu0.2
https://launchpad.net/ubuntu/+source/znc/1.6.3-1ubuntu0.2

USN-4045-1: Thunderbird vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4045-1
July 01, 2019

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

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Thunderbird.

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

Details:

A type confusion bug was discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could exploit this by causing a denial of service, or
executing arbirary code. (CVE-2019-11707)

It was discovered that a sandboxed child process could open arbitrary web
content in the parent process via the Prompt:Open IPC message. When
combined with another vulnerability, an attacker could potentially exploit
this to execute arbitrary code. (CVE-2019-11708)

Update instructions:

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

Ubuntu 19.04:
  thunderbird  1:60.7.2+build2-0ubuntu0.19.04.1

Ubuntu 18.10:
  thunderbird  1:60.7.2+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  thunderbird  1:60.7.2+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  thunderbird  1:60.7.2+build2-0ubuntu0.16.04.1

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

References:
  https://usn.ubuntu.com/4045-1
  CVE-2019-11707, CVE-2019-11708

Package Information:
 
https://launchpad.net/ubuntu/+source/thunderbird/1:60.7.2+build2-0ubuntu0.19.04.1
 
https://launchpad.net/ubuntu/+source/thunderbird/1:60.7.2+build2-0ubuntu0.18.10.1
 
https://launchpad.net/ubuntu/+source/thunderbird/1:60.7.2+build2-0ubuntu0.18.04.1
 
https://launchpad.net/ubuntu/+source/thunderbird/1:60.7.2+build2-0ubuntu0.16.04.1