The following updates has been released for Ubuntu Linux:

USN-4110-3: Dovecot regression
USN-4110-4: Dovecot regression
USN-4111-1: Ghostscript vulnerabilities
USN-4112-1: Ceph vulnerability

USN-4110-3: Dovecot regression

=========================================================================
Ubuntu Security Notice USN-4110-3
August 28, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-4110-1 introduced a regression in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a
regression causing a wrong check. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly
handled certain data. An attacker could possibly use this issue
to cause a denial of service or execute arbitrary code.

Update instructions:

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

Ubuntu 19.04:
dovecot-core 1:2.3.4.1-1ubuntu2.4

Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.5

Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.12

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

References:
https://usn.ubuntu.com/4110-3
https://usn.ubuntu.com/4110-1
CVE-2019-11500

Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.4.1-1ubuntu2.4
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.5
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.12

USN-4110-4: Dovecot regression

=========================================================================
Ubuntu Security Notice USN-4110-4
August 28, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

USN-4110-1 introduced a regression in Dovecot.

Software Description:
- dovecot: IMAP and POP3 email server

Details:

USN-4110-1 fixed a vulnerability in Dovecot. The update introduced
a regression causing a wrong check. This update fixes the problem for
Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

We apologize for the inconvenience.

Original advisory details:

Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly
handled certain data. An attacker could possibly use this issue
to cause a denial of service or execute arbitrary code.

Update instructions:

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

Ubuntu 14.04 ESM:
dovecot-core 1:2.2.9-1ubuntu2.6+esm2

Ubuntu 12.04 ESM:
dovecot-core 1:2.0.19-0ubuntu2.8

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

References:
https://usn.ubuntu.com/4110-4
https://usn.ubuntu.com/4110-1
CVE-2019-11500

USN-4111-1: Ghostscript vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4111-1
August 29, 2019

ghostscript vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Ghostscript could be made to access arbitrary files if it opened a
specially crafted file.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

Hiroki Matsukuma discovered that the PDF interpreter in Ghostscript
did not properly restrict privileged calls when ‘-dSAFER’
restrictions were in effect. If a user or automated system were
tricked into processing a specially crafted file, a remote attacker
could possibly use this issue to access arbitrary files.
(CVE-2019-14811, CVE-2019-14812, CVE-2019-14813, CVE-2019-14817)

Update instructions:

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

Ubuntu 19.04:
ghostscript 9.26~dfsg+0-0ubuntu7.3
libgs9 9.26~dfsg+0-0ubuntu7.3

Ubuntu 18.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.18.04.11
libgs9 9.26~dfsg+0-0ubuntu0.18.04.11

Ubuntu 16.04 LTS:
ghostscript 9.26~dfsg+0-0ubuntu0.16.04.11
libgs9 9.26~dfsg+0-0ubuntu0.16.04.11

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

References:
https://usn.ubuntu.com/4111-1
CVE-2019-14811, CVE-2019-14812, CVE-2019-14813, CVE-2019-14817

Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu7.3
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.18.04.11
https://launchpad.net/ubuntu/+source/ghostscript/9.26~dfsg+0-0ubuntu0.16.04.11

USN-4112-1: Ceph vulnerability

=========================================================================
Ubuntu Security Notice USN-4112-1
August 29, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Ceph could be made to crash if it received specially crafted network
traffic.

Software Description:
- ceph: distributed storage and file system

Details:

Abhishek Lekshmanan discovered that the RADOS gateway implementation in
Ceph did not handle client disconnects properly in some situations. A
remote attacker could use this to cause a denial of service.

Update instructions:

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

Ubuntu 19.04:
ceph 13.2.6-0ubuntu0.19.04.3
radosgw 13.2.6-0ubuntu0.19.04.3

Ubuntu 18.04 LTS:
ceph 12.2.12-0ubuntu0.18.04.2
radosgw 12.2.12-0ubuntu0.18.04.2

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

References:
https://usn.ubuntu.com/4112-1
CVE-2019-10222

Package Information:
https://launchpad.net/ubuntu/+source/ceph/13.2.6-0ubuntu0.19.04.3
https://launchpad.net/ubuntu/+source/ceph/12.2.12-0ubuntu0.18.04.2