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Red Hat Security Advisory 2019-1791-01

Red Hat Security Advisory 2019-1791-01
Posted Jul 16, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-1791-01 - The libssh2 packages provide a library that implements the SSH2 protocol. Issues addressed include an out of bounds write vulnerability.

tags | advisory, protocol
systems | linux, redhat
advisories | CVE-2019-3855, CVE-2019-3856, CVE-2019-3857, CVE-2019-3863
MD5 | 069b0013cb2714eb78933e51a27be507

Red Hat Security Advisory 2019-1791-01

Change Mirror Download
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====================================================================
Red Hat Security Advisory

Synopsis: Important: libssh2 security update
Advisory ID: RHSA-2019:1791-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:1791
Issue date: 2019-07-16
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 7.5
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. 7.5) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) - noarch, x86_64
Red Hat Enterprise Linux Server EUS (v. 7.5) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.5) - 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. 7.5):

Source:
libssh2-1.4.3-11.el7_5.1.src.rpm

x86_64:
libssh2-1.4.3-11.el7_5.1.i686.rpm
libssh2-1.4.3-11.el7_5.1.x86_64.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5):

noarch:
libssh2-docs-1.4.3-11.el7_5.1.noarch.rpm

x86_64:
libssh2-debuginfo-1.4.3-11.el7_5.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.x86_64.rpm
libssh2-devel-1.4.3-11.el7_5.1.i686.rpm
libssh2-devel-1.4.3-11.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.5):

Source:
libssh2-1.4.3-11.el7_5.1.src.rpm

ppc64:
libssh2-1.4.3-11.el7_5.1.ppc.rpm
libssh2-1.4.3-11.el7_5.1.ppc64.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc64.rpm

ppc64le:
libssh2-1.4.3-11.el7_5.1.ppc64le.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc64le.rpm

s390x:
libssh2-1.4.3-11.el7_5.1.s390.rpm
libssh2-1.4.3-11.el7_5.1.s390x.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.s390.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.s390x.rpm

x86_64:
libssh2-1.4.3-11.el7_5.1.i686.rpm
libssh2-1.4.3-11.el7_5.1.x86_64.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.5):

noarch:
libssh2-docs-1.4.3-11.el7_5.1.noarch.rpm

ppc64:
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc64.rpm
libssh2-devel-1.4.3-11.el7_5.1.ppc.rpm
libssh2-devel-1.4.3-11.el7_5.1.ppc64.rpm

ppc64le:
libssh2-debuginfo-1.4.3-11.el7_5.1.ppc64le.rpm
libssh2-devel-1.4.3-11.el7_5.1.ppc64le.rpm

s390x:
libssh2-debuginfo-1.4.3-11.el7_5.1.s390.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.s390x.rpm
libssh2-devel-1.4.3-11.el7_5.1.s390.rpm
libssh2-devel-1.4.3-11.el7_5.1.s390x.rpm

x86_64:
libssh2-debuginfo-1.4.3-11.el7_5.1.i686.rpm
libssh2-debuginfo-1.4.3-11.el7_5.1.x86_64.rpm
libssh2-devel-1.4.3-11.el7_5.1.i686.rpm
libssh2-devel-1.4.3-11.el7_5.1.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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