[USN-4219-1] libssh vulnerability

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==========================================================================
Ubuntu Security Notice USN-4219-1
December 10, 2019

libssh vulnerability
==========================================================================

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libssh could be made to run programs under certain conditions.

Software Description:
- libssh: A tiny C SSH library

Details:

It was discovered that libssh incorrectly handled certain scp commands. If
a user or automated system were tricked into using a specially-crafted scp
command, a remote attacker could execute arbitrary commands on the server.

Update instructions:

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

Ubuntu 19.10:
libssh-4 0.9.0-1ubuntu1.3

Ubuntu 19.04:
libssh-4 0.8.6-3ubuntu0.3

Ubuntu 18.04 LTS:
libssh-4 0.8.0~20170825.94fa1e38-1ubuntu0.5

Ubuntu 16.04 LTS:
libssh-4 0.6.3-4.3ubuntu0.5

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

References:
https://usn.ubuntu.com/4219-1
CVE-2019-14889

Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.9.0-1ubuntu1.3
https://launchpad.net/ubuntu/+source/libssh/0.8.6-3ubuntu0.3
https://launchpad.net/ubuntu/+source/libssh/0.8.0~20170825.94fa1e38-1ubuntu0.5
https://launchpad.net/ubuntu/+source/libssh/0.6.3-4.3ubuntu0.5