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

Synopsis:          Moderate: libssh2 security update
Advisory ID:       RHSA-2016:0428-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0428.html
Issue date:        2016-03-10
CVE Names:         CVE-2016-0787 
=====================================================================

1. Summary:

Updated libssh2 packages that fix one security issue are now available 
for Red Hat Enterprise Linux 6 and 7.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

3. Description:

The libssh2 packages provide a library that implements the SSHv2 protocol.

A type confusion issue was found in the way libssh2 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-2016-0787)

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

All libssh2 users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. After installing these
updated packages, all running applications using libssh2 must be restarted
for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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

1306021 - CVE-2016-0787 libssh2: bits/bytes confusion resulting in truncated Diffie-Hellman secret length

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
libssh2-1.4.2-2.el6_7.1.src.rpm

i386:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm

x86_64:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-docs-1.4.2-2.el6_7.1.i686.rpm

x86_64:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-docs-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
libssh2-1.4.2-2.el6_7.1.src.rpm

x86_64:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-docs-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
libssh2-1.4.2-2.el6_7.1.src.rpm

i386:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm

ppc64:
libssh2-1.4.2-2.el6_7.1.ppc.rpm
libssh2-1.4.2-2.el6_7.1.ppc64.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.ppc.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.ppc64.rpm

s390x:
libssh2-1.4.2-2.el6_7.1.s390.rpm
libssh2-1.4.2-2.el6_7.1.s390x.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.s390.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.s390x.rpm

x86_64:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-docs-1.4.2-2.el6_7.1.i686.rpm

ppc64:
libssh2-debuginfo-1.4.2-2.el6_7.1.ppc.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.ppc64.rpm
libssh2-devel-1.4.2-2.el6_7.1.ppc.rpm
libssh2-devel-1.4.2-2.el6_7.1.ppc64.rpm
libssh2-docs-1.4.2-2.el6_7.1.ppc64.rpm

s390x:
libssh2-debuginfo-1.4.2-2.el6_7.1.s390.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.s390x.rpm
libssh2-devel-1.4.2-2.el6_7.1.s390.rpm
libssh2-devel-1.4.2-2.el6_7.1.s390x.rpm
libssh2-docs-1.4.2-2.el6_7.1.s390x.rpm

x86_64:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-docs-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
libssh2-1.4.2-2.el6_7.1.src.rpm

i386:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm

x86_64:
libssh2-1.4.2-2.el6_7.1.i686.rpm
libssh2-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-docs-1.4.2-2.el6_7.1.i686.rpm

x86_64:
libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
libssh2-devel-1.4.2-2.el6_7.1.x86_64.rpm
libssh2-docs-1.4.2-2.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
libssh2-1.4.3-10.el7_2.1.src.rpm

x86_64:
libssh2-1.4.3-10.el7_2.1.i686.rpm
libssh2-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

noarch:
libssh2-docs-1.4.3-10.el7_2.1.noarch.rpm

x86_64:
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-devel-1.4.3-10.el7_2.1.i686.rpm
libssh2-devel-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libssh2-1.4.3-10.el7_2.1.src.rpm

x86_64:
libssh2-1.4.3-10.el7_2.1.i686.rpm
libssh2-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

noarch:
libssh2-docs-1.4.3-10.el7_2.1.noarch.rpm

x86_64:
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-devel-1.4.3-10.el7_2.1.i686.rpm
libssh2-devel-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libssh2-1.4.3-10.el7_2.1.src.rpm

ppc64:
libssh2-1.4.3-10.el7_2.1.ppc.rpm
libssh2-1.4.3-10.el7_2.1.ppc64.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc64.rpm

ppc64le:
libssh2-1.4.3-10.el7_2.1.ppc64le.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc64le.rpm

s390x:
libssh2-1.4.3-10.el7_2.1.s390.rpm
libssh2-1.4.3-10.el7_2.1.s390x.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.s390.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.s390x.rpm

x86_64:
libssh2-1.4.3-10.el7_2.1.i686.rpm
libssh2-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

noarch:
libssh2-docs-1.4.3-10.el7_2.1.noarch.rpm

ppc64:
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc64.rpm
libssh2-devel-1.4.3-10.el7_2.1.ppc.rpm
libssh2-devel-1.4.3-10.el7_2.1.ppc64.rpm

ppc64le:
libssh2-debuginfo-1.4.3-10.el7_2.1.ppc64le.rpm
libssh2-devel-1.4.3-10.el7_2.1.ppc64le.rpm

s390x:
libssh2-debuginfo-1.4.3-10.el7_2.1.s390.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.s390x.rpm
libssh2-devel-1.4.3-10.el7_2.1.s390.rpm
libssh2-devel-1.4.3-10.el7_2.1.s390x.rpm

x86_64:
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-devel-1.4.3-10.el7_2.1.i686.rpm
libssh2-devel-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libssh2-1.4.3-10.el7_2.1.src.rpm

x86_64:
libssh2-1.4.3-10.el7_2.1.i686.rpm
libssh2-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

noarch:
libssh2-docs-1.4.3-10.el7_2.1.noarch.rpm

x86_64:
libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm
libssh2-devel-1.4.3-10.el7_2.1.i686.rpm
libssh2-devel-1.4.3-10.el7_2.1.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-2016-0787
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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