==========================================================================
Ubuntu Security Notice USN-2912-1
February 23, 2016

libssh vulnerabilities
==========================================================================

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

– Ubuntu 15.10
– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in libssh.

Software Description:
– libssh: A tiny C SSH library

Details:

Mariusz Ziulek discovered that libssh incorrectly handled certain packets.
A remote attacker could possibly use this issue to cause libssh to crash,
resulting in a denial of service.
(CVE-2015-3146)

Aris Adamantiadis discovered that libssh incorrectly generated ephemeral
secret keys of 128 bits instead of the recommended 1024 or 2048 bits when
using the diffie-hellman-group1 and diffie-hellman-group14 methods. If a
remote attacker were able to perform a man-in-the-middle attack, this flaw
could be exploited to view sensitive information. (CVE-2016-0739)

Update instructions:

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

Ubuntu 15.10:
libssh-4 0.6.3-3ubuntu3.2

Ubuntu 14.04 LTS:
libssh-4 0.6.1-0ubuntu3.3

Ubuntu 12.04 LTS:
libssh-4 0.5.2-1ubuntu0.12.04.6

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

References:
http://www.ubuntu.com/usn/usn-2912-1
CVE-2015-3146, CVE-2016-0739

Package Information:
https://launchpad.net/ubuntu/+source/libssh/0.6.3-3ubuntu3.2
https://launchpad.net/ubuntu/+source/libssh/0.6.1-0ubuntu3.3
https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.04.6

—–BEGIN PGP SIGNATURE—–
Version: GnuPG v2
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=Z9sI
—–END PGP SIGNATURE—–
—