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Red Hat Security Advisory

Synopsis: Moderate: libssh2 security, bug fix, and enhancement update
Advisory ID: RHSA-2019:2136-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2136
Issue date: 2019-08-06
CVE Names: CVE-2019-3858 CVE-2019-3861
=====================================================================

1. Summary:

An update for libssh2 is now available for Red Hat Enterprise Linux 7.

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 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 Server (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – noarch, x86_64

3. Description:

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

The following packages have been upgraded to a later upstream version:
libssh2 (1.8.0). (BZ#1592784)

Security Fix(es):

* libssh2: Zero-byte allocation with a specially crafted SFTP packed
leading to an out-of-bounds read (CVE-2019-3858)

* libssh2: Out-of-bounds reads with specially crafted SSH packets
(CVE-2019-3861)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.7 Release Notes linked from 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/):

1687306 – CVE-2019-3858 libssh2: Zero-byte allocation with a specially crafted SFTP packed leading to an out-of-bounds read
1687311 – CVE-2019-3861 libssh2: Out-of-bounds reads with specially crafted SSH packets

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
libssh2-1.8.0-3.el7.src.rpm

x86_64:
libssh2-1.8.0-3.el7.i686.rpm
libssh2-1.8.0-3.el7.x86_64.rpm
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm

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

noarch:
libssh2-docs-1.8.0-3.el7.noarch.rpm

x86_64:
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm
libssh2-devel-1.8.0-3.el7.i686.rpm
libssh2-devel-1.8.0-3.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libssh2-1.8.0-3.el7.src.rpm

x86_64:
libssh2-1.8.0-3.el7.i686.rpm
libssh2-1.8.0-3.el7.x86_64.rpm
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm

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

noarch:
libssh2-docs-1.8.0-3.el7.noarch.rpm

x86_64:
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm
libssh2-devel-1.8.0-3.el7.i686.rpm
libssh2-devel-1.8.0-3.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libssh2-1.8.0-3.el7.src.rpm

ppc64:
libssh2-1.8.0-3.el7.ppc.rpm
libssh2-1.8.0-3.el7.ppc64.rpm
libssh2-debuginfo-1.8.0-3.el7.ppc.rpm
libssh2-debuginfo-1.8.0-3.el7.ppc64.rpm

ppc64le:
libssh2-1.8.0-3.el7.ppc64le.rpm
libssh2-debuginfo-1.8.0-3.el7.ppc64le.rpm

s390x:
libssh2-1.8.0-3.el7.s390.rpm
libssh2-1.8.0-3.el7.s390x.rpm
libssh2-debuginfo-1.8.0-3.el7.s390.rpm
libssh2-debuginfo-1.8.0-3.el7.s390x.rpm

x86_64:
libssh2-1.8.0-3.el7.i686.rpm
libssh2-1.8.0-3.el7.x86_64.rpm
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm

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

noarch:
libssh2-docs-1.8.0-3.el7.noarch.rpm

ppc64:
libssh2-debuginfo-1.8.0-3.el7.ppc.rpm
libssh2-debuginfo-1.8.0-3.el7.ppc64.rpm
libssh2-devel-1.8.0-3.el7.ppc.rpm
libssh2-devel-1.8.0-3.el7.ppc64.rpm

ppc64le:
libssh2-debuginfo-1.8.0-3.el7.ppc64le.rpm
libssh2-devel-1.8.0-3.el7.ppc64le.rpm

s390x:
libssh2-debuginfo-1.8.0-3.el7.s390.rpm
libssh2-debuginfo-1.8.0-3.el7.s390x.rpm
libssh2-devel-1.8.0-3.el7.s390.rpm
libssh2-devel-1.8.0-3.el7.s390x.rpm

x86_64:
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm
libssh2-devel-1.8.0-3.el7.i686.rpm
libssh2-devel-1.8.0-3.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libssh2-1.8.0-3.el7.src.rpm

x86_64:
libssh2-1.8.0-3.el7.i686.rpm
libssh2-1.8.0-3.el7.x86_64.rpm
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm

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

noarch:
libssh2-docs-1.8.0-3.el7.noarch.rpm

x86_64:
libssh2-debuginfo-1.8.0-3.el7.i686.rpm
libssh2-debuginfo-1.8.0-3.el7.x86_64.rpm
libssh2-devel-1.8.0-3.el7.i686.rpm
libssh2-devel-1.8.0-3.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-2019-3858
https://access.redhat.com/security/cve/CVE-2019-3861
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index

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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