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AUSCERT External Security Bulletin Redistribution
ESB-2019.2638
Important: libssh2 security update
17 July 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libssh2
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3863 CVE-2019-3857 CVE-2019-3856
CVE-2019-3855
Reference: ESB-2019.2427
ESB-2019.1047
Original Bulletin:
https://access.redhat.com/errata/RHSA-2019:1791
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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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