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Ubuntu Security Notice USN-3809-1
November 06, 2018

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in OpenSSH.

Software Description:
- openssh: secure shell (SSH) for secure access to remote machines

Details:

Robert Swiecki discovered that OpenSSH incorrectly handled certain
messages. An attacker could possibly use this issue to cause a denial
of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04
LTS. (CVE-2016-10708)

It was discovered that OpenSSH incorrectly handled certain requests.
An attacker could possibly use this issue to access sensitive
information. (CVE-2018-15473)

Update instructions:

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

Ubuntu 18.04 LTS:
  openssh-server                  1:7.6p1-4ubuntu0.1

Ubuntu 16.04 LTS:
  openssh-server                  1:7.2p2-4ubuntu2.6

Ubuntu 14.04 LTS:
  openssh-server                  1:6.6p1-2ubuntu2.11

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

References:
  https://usn.ubuntu.com/usn/usn-3809-1
  CVE-2016-10708, CVE-2018-15473

Package Information:
  https://launchpad.net/ubuntu/+source/openssh/1:7.6p1-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/openssh/1:7.2p2-4ubuntu2.6
  https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.11