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

Synopsis:          Important: libssh2 security update
Advisory ID:       RHSA-2019:1943-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:1943
Issue date:        2019-07-30
CVE Names:         CVE-2019-3855 CVE-2019-3856 CVE-2019-3857 
                   CVE-2019-3863 
=====================================================================

1. Summary:

An update for libssh2 is now available for Red Hat Enterprise Linux 7.4
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 ComputeNode EUS (v. 7.4) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - noarch, x86_64
Red Hat Enterprise Linux Server EUS (v. 7.4) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64

3. Description:

The libssh2 packages provide a library that implements the SSH2 protocol.

Security Fix(es):

* libssh2: Integer overflow in transport read resulting in out of bounds
write (CVE-2019-3855)

* libssh2: Integer overflow in keyboard interactive handling resulting in
out of bounds write (CVE-2019-3856)

* libssh2: Integer overflow in SSH packet processing channel resulting in
out of bounds write (CVE-2019-3857)

* libssh2: Integer overflow in user authenticate keyboard interactive
allows out-of-bounds writes (CVE-2019-3863)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

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
libssh2 must be restarted for this update to take effect.

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

1687303 - CVE-2019-3855 libssh2: Integer overflow in transport read resulting in out of bounds write
1687304 - CVE-2019-3856 libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write
1687305 - CVE-2019-3857 libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write
1687313 - CVE-2019-3863 libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4):

Source:
libssh2-1.4.3-11.el7_4.1.src.rpm

x86_64:
libssh2-1.4.3-11.el7_4.1.i686.rpm
libssh2-1.4.3-11.el7_4.1.x86_64.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):

noarch:
libssh2-docs-1.4.3-11.el7_4.1.noarch.rpm

x86_64:
libssh2-debuginfo-1.4.3-11.el7_4.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.x86_64.rpm
libssh2-devel-1.4.3-11.el7_4.1.i686.rpm
libssh2-devel-1.4.3-11.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.4):

Source:
libssh2-1.4.3-11.el7_4.1.src.rpm

ppc64:
libssh2-1.4.3-11.el7_4.1.ppc.rpm
libssh2-1.4.3-11.el7_4.1.ppc64.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc64.rpm

ppc64le:
libssh2-1.4.3-11.el7_4.1.ppc64le.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc64le.rpm

s390x:
libssh2-1.4.3-11.el7_4.1.s390.rpm
libssh2-1.4.3-11.el7_4.1.s390x.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.s390.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.s390x.rpm

x86_64:
libssh2-1.4.3-11.el7_4.1.i686.rpm
libssh2-1.4.3-11.el7_4.1.x86_64.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.4):

noarch:
libssh2-docs-1.4.3-11.el7_4.1.noarch.rpm

ppc64:
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc64.rpm
libssh2-devel-1.4.3-11.el7_4.1.ppc.rpm
libssh2-devel-1.4.3-11.el7_4.1.ppc64.rpm

ppc64le:
libssh2-debuginfo-1.4.3-11.el7_4.1.ppc64le.rpm
libssh2-devel-1.4.3-11.el7_4.1.ppc64le.rpm

s390x:
libssh2-debuginfo-1.4.3-11.el7_4.1.s390.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.s390x.rpm
libssh2-devel-1.4.3-11.el7_4.1.s390.rpm
libssh2-devel-1.4.3-11.el7_4.1.s390x.rpm

x86_64:
libssh2-debuginfo-1.4.3-11.el7_4.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_4.1.x86_64.rpm
libssh2-devel-1.4.3-11.el7_4.1.i686.rpm
libssh2-devel-1.4.3-11.el7_4.1.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-2019-3855
https://access.redhat.com/security/cve/CVE-2019-3856
https://access.redhat.com/security/cve/CVE-2019-3857
https://access.redhat.com/security/cve/CVE-2019-3863
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2019 Red Hat, Inc.
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