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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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