The following security updates has been released for Ubuntu Linux:

USN-4129-2: curl vulnerability
USN-4132-1: Expat vulnerability
USN-4132-2: Expat vulnerability

USN-4129-2: curl vulnerability

=========================================================================
Ubuntu Security Notice USN-4129-2
September 12, 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 or possibly execute arbitrary code
if it incorrectly handled memory during TFTP transfers.

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

Details:

USN-4129-1 fixed a vulnerability in curl. This update provides
the corresponding update for Ubuntu 12.04 ESM and 14.04 ESM.

Original advisory details:

Thomas Vegas discovered that curl incorrectly handled memory during TFTP
transfers. A remote attacker could use this issue to crash curl, resulting
in a denial of service, or possibly execute arbitrary code.

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+esm3
libcurl3 7.35.0-1ubuntu2.20+esm3
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm3
libcurl3-nss 7.35.0-1ubuntu2.20+esm3

Ubuntu 12.04 ESM:
curl 7.22.0-3ubuntu4.27
libcurl3 7.22.0-3ubuntu4.27
libcurl3-gnutls 7.22.0-3ubuntu4.27
libcurl3-nss 7.22.0-3ubuntu4.27

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

References:
https://usn.ubuntu.com/4129-2
https://usn.ubuntu.com/4129-1
CVE-2019-5482

USN-4132-1: Expat vulnerability

=========================================================================
Ubuntu Security Notice USN-4132-1
September 12, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Expat could be made to expose sensitive information if it received a
specially crafted XML file.

Software Description:
- expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled certain XML files.
An attacker could possibly use this issue to expose sensitive information.

Update instructions:

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

Ubuntu 19.04:
libexpat1 2.2.6-1ubuntu0.19.5

Ubuntu 18.04 LTS:
libexpat1 2.2.5-3ubuntu0.2

Ubuntu 16.04 LTS:
lib64expat1 2.1.0-7ubuntu0.16.04.5
libexpat1 2.1.0-7ubuntu0.16.04.5

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

References:
https://usn.ubuntu.com/4132-1
CVE-2019-15903

Package Information:
https://launchpad.net/ubuntu/+source/expat/2.2.6-1ubuntu0.19.5
https://launchpad.net/ubuntu/+source/expat/2.2.5-3ubuntu0.2
https://launchpad.net/ubuntu/+source/expat/2.1.0-7ubuntu0.16.04.5

USN-4132-2: Expat vulnerability

=========================================================================
Ubuntu Security Notice USN-4132-2
September 12, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Expat could be made to expose sensitive information if it received
a specially crafted XML file.

Software Description:
- expat: XML parsing C library

Details:

USN-4132-1 fixed a vulnerability in Expat. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Expat incorrectly handled certain XML files.
An attacker could possibly use this issue to expose sensitive information.

Update instructions:

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

Ubuntu 14.04 ESM:
lib64expat1 2.1.0-4ubuntu1.4+esm2
libexpat1 2.1.0-4ubuntu1.4+esm2

Ubuntu 12.04 ESM:
lib64expat1 2.0.1-7.2ubuntu1.7
libexpat1 2.0.1-7.2ubuntu1.7

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

References:
https://usn.ubuntu.com/4132-2
https://usn.ubuntu.com/4132-1
CVE-2019-15903