The following updates has been released for Ubuntu Linux:

USN-3627-1: Apache HTTP Server vulnerabilities
USN-3628-1: OpenSSL vulnerability
USN-3628-2: OpenSSL vulnerability

USN-3627-1: Apache HTTP Server vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3627-1
April 19, 2018

apache2 vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Apache HTTP Server.

Software Description:
- apache2: Apache HTTP server

Details:

Alex Nichols and Jakob Hirsch discovered that the Apache HTTP Server
mod_authnz_ldap module incorrectly handled missing charset encoding
headers. A remote attacker could possibly use this issue to cause the
server to crash, resulting in a denial of service. (CVE-2017-15710)

Elar Lang discovered that the Apache HTTP Server incorrectly handled
certain characters specified in . A remote attacker could
possibly use this issue to upload certain files, contrary to expectations.
(CVE-2017-15715)

It was discovered that the Apache HTTP Server mod_session module
incorrectly handled certain headers. A remote attacker could possibly use
this issue to influence session data. (CVE-2018-1283)

Robert Swiecki discovered that the Apache HTTP Server incorrectly handled
certain requests. A remote attacker could possibly use this issue to cause
the server to crash, leading to a denial of service. (CVE-2018-1301)

Robert Swiecki discovered that the Apache HTTP Server mod_cache_socache
module incorrectly handled certain headers. A remote attacker could
possibly use this issue to cause the server to crash, leading to a denial
of service. (CVE-2018-1303)

Nicolas Daniels discovered that the Apache HTTP Server incorrectly
generated the nonce when creating HTTP Digest authentication challenges.
A remote attacker could possibly use this issue to replay HTTP requests
across a cluster of servers. (CVE-2018-1312)

Update instructions:

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

Ubuntu 17.10:
apache2-bin 2.4.27-2ubuntu4.1

Ubuntu 16.04 LTS:
apache2-bin 2.4.18-2ubuntu3.8

Ubuntu 14.04 LTS:
apache2-bin 2.4.7-1ubuntu4.20

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

References:
https://usn.ubuntu.com/usn/usn-3627-1
CVE-2017-15710, CVE-2017-15715, CVE-2018-1283, CVE-2018-1301,
CVE-2018-1303, CVE-2018-1312

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.27-2ubuntu4.1
https://launchpad.net/ubuntu/+source/apache2/2.4.18-2ubuntu3.8
https://launchpad.net/ubuntu/+source/apache2/2.4.7-1ubuntu4.20

USN-3628-1: OpenSSL vulnerability

==========================================================================
Ubuntu Security Notice USN-3628-1
April 19, 2018

openssl vulnerability
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

OpenSSL could allow access to sensitve information.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis
Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA
key generation. An attacker could possibly use this issue to perform a
cache-timing attack and recover private RSA keys.

Update instructions:

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

Ubuntu 17.10:
  libssl1.0.0 1.0.2g-1ubuntu13.5

Ubuntu 16.04 LTS:
  libssl1.0.0 1.0.2g-1ubuntu4.12

Ubuntu 14.04 LTS:
  libssl1.0.0 1.0.1f-1ubuntu2.25

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

References:
  https://usn.ubuntu.com/usn/usn-3628-1
  CVE-2018-0737

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu13.5
  https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.12
  https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.25

USN-3628-2: OpenSSL vulnerability

==========================================================================
Ubuntu Security Notice USN-3628-2
April 19, 2018

openssl vulnerability
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

OpenSSL could allow access to sensitve information.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

USN-3628-1 fixed a vulnerability in OpenSSL. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis
 Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA
 key generation. An attacker could possibly use this issue to perform a
 cache-timing attack and recover private RSA keys.

Update instructions:

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

Ubuntu 12.04 ESM:
  libssl1.0.0 1.0.1-4ubuntu5.41

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

References:
  https://usn.ubuntu.com/usn/usn-3628-2
  https://usn.ubuntu.com/usn/usn-3628-1
  CVE-2018-0737