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Red Hat Security Advisory 2016-0566-01

Red Hat Security Advisory 2016-0566-01
Posted Apr 4, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0566-01 - libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Security Fix: A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters.

tags | advisory, protocol
systems | linux, redhat
advisories | CVE-2016-0739
MD5 | a7fc043e4eff39b58f3e8194d5171d0d

Red Hat Security Advisory 2016-0566-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: libssh security update
Advisory ID: RHSA-2016:0566-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0566.html
Issue date: 2016-03-31
CVE Names: CVE-2016-0739
=====================================================================

1. Summary:

An update for libssh is now available for Red Hat Enterprise Linux 7
Extras.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux 7 Extras - x86_64

3. Description:

libssh is a library which implements the SSH protocol. It can be used to
implement client and server applications.

Security Fix(es):

* A type confusion issue was found in the way libssh generated ephemeral
secrets for the diffie-hellman-group1 and diffie-hellman-group14 key
exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use
significantly less secure random parameters. (CVE-2016-0739)

Red Hat would like to thank Aris Adamantiadis for reporting this issue.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing these updated packages, all running applications using
libssh must be restarted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1305971 - CVE-2016-0739 libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length

6. Package List:

Red Hat Enterprise Linux 7 Extras:

Source:
libssh-0.7.1-2.el7.src.rpm

x86_64:
libssh-0.7.1-2.el7.x86_64.rpm
libssh-debuginfo-0.7.1-2.el7.x86_64.rpm
libssh-devel-0.7.1-2.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-0739
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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