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AUSCERT External Security Bulletin Redistribution
ESB-2021.3768
libssh security update
10 November 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libssh
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-16135
Reference: ESB-2020.2669
ESB-2020.2629
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:4387
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Red Hat Security Advisory
Synopsis: Low: libssh security update
Advisory ID: RHSA-2021:4387-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4387
Issue date: 2021-11-09
CVE Names: CVE-2020-16135
=====================================================================
1. Summary:
An update for libssh is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact
of Low. 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 AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64
3. Description:
libssh is a library which implements the SSH protocol. It can be used to
implement client and server applications.
Security Fix(es):
* libssh: NULL pointer dereference in sftpserver.c if ssh_buffer_new
returns NULL (CVE-2020-16135)
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 8.5 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
libssh must be restarted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1862456 - CVE-2020-16135 libssh: NULL pointer dereference in sftpserver.c if ssh_buffer_new returns NULL
6. Package List:
Red Hat Enterprise Linux AppStream (v. 8):
aarch64:
libssh-debuginfo-0.9.4-3.el8.aarch64.rpm
libssh-debugsource-0.9.4-3.el8.aarch64.rpm
libssh-devel-0.9.4-3.el8.aarch64.rpm
ppc64le:
libssh-debuginfo-0.9.4-3.el8.ppc64le.rpm
libssh-debugsource-0.9.4-3.el8.ppc64le.rpm
libssh-devel-0.9.4-3.el8.ppc64le.rpm
s390x:
libssh-debuginfo-0.9.4-3.el8.s390x.rpm
libssh-debugsource-0.9.4-3.el8.s390x.rpm
libssh-devel-0.9.4-3.el8.s390x.rpm
x86_64:
libssh-debuginfo-0.9.4-3.el8.i686.rpm
libssh-debuginfo-0.9.4-3.el8.x86_64.rpm
libssh-debugsource-0.9.4-3.el8.i686.rpm
libssh-debugsource-0.9.4-3.el8.x86_64.rpm
libssh-devel-0.9.4-3.el8.i686.rpm
libssh-devel-0.9.4-3.el8.x86_64.rpm
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
libssh-0.9.4-3.el8.src.rpm
aarch64:
libssh-0.9.4-3.el8.aarch64.rpm
libssh-debuginfo-0.9.4-3.el8.aarch64.rpm
libssh-debugsource-0.9.4-3.el8.aarch64.rpm
noarch:
libssh-config-0.9.4-3.el8.noarch.rpm
ppc64le:
libssh-0.9.4-3.el8.ppc64le.rpm
libssh-debuginfo-0.9.4-3.el8.ppc64le.rpm
libssh-debugsource-0.9.4-3.el8.ppc64le.rpm
s390x:
libssh-0.9.4-3.el8.s390x.rpm
libssh-debuginfo-0.9.4-3.el8.s390x.rpm
libssh-debugsource-0.9.4-3.el8.s390x.rpm
x86_64:
libssh-0.9.4-3.el8.i686.rpm
libssh-0.9.4-3.el8.x86_64.rpm
libssh-debuginfo-0.9.4-3.el8.i686.rpm
libssh-debuginfo-0.9.4-3.el8.x86_64.rpm
libssh-debugsource-0.9.4-3.el8.i686.rpm
libssh-debugsource-0.9.4-3.el8.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-2020-16135
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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