The following updates has been released for Ubuntu Linux:

USN-3977-2: Intel Microcode update
USN-3993-2: curl vulnerability

USN-3977-2: Intel Microcode update

==========================================================================
Ubuntu Security Notice USN-3977-2
May 22, 2019

intel-microcode update
==========================================================================

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
- Ubuntu 14.04 ESM

Summary:

The system could be made to expose sensitive information.

Software Description:
- intel-microcode: Processor microcode for Intel CPUs

Details:

USN-3977-1 provided mitigations for Microarchitectural Data Sampling
(MDS) vulnerabilities in Intel Microcode for a large number of Intel
processor families. This update provides the corresponding updated
microcode mitigations for Intel Cherry Trail and Bay Trail processor
families.

Original advisory details:

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan
Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa
Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos,
Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss
discovered that memory previously stored in microarchitectural fill buffers
of an Intel CPU core may be exposed to a malicious process that is
executing on the same CPU core. A local attacker could use this to expose
sensitive information. (CVE-2018-12130)

Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan
van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh
Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory
previously stored in microarchitectural load ports of an Intel CPU core may
be exposed to a malicious process that is executing on the same CPU core. A
local attacker could use this to expose sensitive information.
(CVE-2018-12127)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel
Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel
Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory
previously stored in microarchitectural store buffers of an Intel CPU core
may be exposed to a malicious process that is executing on the same CPU
core. A local attacker could use this to expose sensitive information.
(CVE-2018-12126)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur,
Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa
Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and
Cristiano Giuffrida discovered that uncacheable memory previously stored in
microarchitectural buffers of an Intel CPU core may be exposed to a
malicious process that is executing on the same CPU core. A local attacker
could use this to expose sensitive information. (CVE-2019-11091)

Update instructions:

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

Ubuntu 19.04:
intel-microcode 3.20190514.0ubuntu0.19.04.3

Ubuntu 18.10:
intel-microcode 3.20190514.0ubuntu0.18.10.2

Ubuntu 18.04 LTS:
intel-microcode 3.20190514.0ubuntu0.18.04.3

Ubuntu 16.04 LTS:
intel-microcode 3.20190514.0ubuntu0.16.04.2

Ubuntu 14.04 ESM:
intel-microcode 3.20190514.0ubuntu0.14.04.2

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

References:
https://usn.ubuntu.com/usn/usn-3977-2
https://usn.ubuntu.com/usn/usn-3977-1
CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

Package Information:
https://launchpad.net/ubuntu/+source/intel-microcode/3.20190514.0ubuntu0.19.04.3
https://launchpad.net/ubuntu/+source/intel-microcode/3.20190514.0ubuntu0.18.10.2
https://launchpad.net/ubuntu/+source/intel-microcode/3.20190514.0ubuntu0.18.04.3
https://launchpad.net/ubuntu/+source/intel-microcode/3.20190514.0ubuntu0.16.04.2

USN-3993-2: curl vulnerability

==========================================================================
Ubuntu Security Notice USN-3993-2
May 22, 2019

curl vulnerability
==========================================================================

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

curl could be made to crash if it received a specially crafted data.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

USN-3993-1 fixed a vulnerability in curl. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that curl incorrectly handled memory when receiving
data from a TFTP server. A remote attacker could use this issue to
cause curl to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2019-5436)

Update instructions:

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

Ubuntu 14.04 ESM:
curl 7.35.0-1ubuntu2.20+esm2
libcurl3 7.35.0-1ubuntu2.20+esm2
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm2
libcurl3-nss 7.35.0-1ubuntu2.20+esm2

Ubuntu 12.04 ESM:
curl 7.22.0-3ubuntu4.26
libcurl3 7.22.0-3ubuntu4.26
libcurl3-gnutls 7.22.0-3ubuntu4.26
libcurl3-nss 7.22.0-3ubuntu4.26

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

References:
https://usn.ubuntu.com/usn/usn-3993-2
https://usn.ubuntu.com/usn/usn-3993-1
CVE-2019-5436