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Red Hat Security Advisory
Synopsis: Moderate: libssh security, bug fix, and enhancement update
Advisory ID: RHSA-2020:4545-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:4545
Issue date: 2020-11-03
CVE Names: CVE-2019-14889 CVE-2020-1730
=====================================================================
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 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 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.
The following packages have been upgraded to a later upstream version:
libssh (0.9.4). (BZ#1804797)
Security Fix(es):
* libssh: denial of service when handling AES-CTR (or DES) ciphers
(CVE-2020-1730)
* libssh: unsanitized location in scp could lead to unwanted command
execution (CVE-2019-14889)
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 8.3 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/):
1733914 – No $HOME/.config dir created if connect libvirtd with libssh
1772523 – CVE-2019-14889 libssh: unsanitized location in scp could lead to unwanted command execution
1801998 – CVE-2020-1730 libssh: denial of service when handling AES-CTR (or DES) ciphers
1804797 – Rebase libssh to the latest upstream version
1821339 – libssh based server automatically tries to load OpenSSH server configuration
1849071 – libssh ssh_channel_read() randomly returns error
6. Package List:
Red Hat Enterprise Linux AppStream (v. 8):
aarch64:
libssh-debuginfo-0.9.4-2.el8.aarch64.rpm
libssh-debugsource-0.9.4-2.el8.aarch64.rpm
libssh-devel-0.9.4-2.el8.aarch64.rpm
ppc64le:
libssh-debuginfo-0.9.4-2.el8.ppc64le.rpm
libssh-debugsource-0.9.4-2.el8.ppc64le.rpm
libssh-devel-0.9.4-2.el8.ppc64le.rpm
s390x:
libssh-debuginfo-0.9.4-2.el8.s390x.rpm
libssh-debugsource-0.9.4-2.el8.s390x.rpm
libssh-devel-0.9.4-2.el8.s390x.rpm
x86_64:
libssh-debuginfo-0.9.4-2.el8.i686.rpm
libssh-debuginfo-0.9.4-2.el8.x86_64.rpm
libssh-debugsource-0.9.4-2.el8.i686.rpm
libssh-debugsource-0.9.4-2.el8.x86_64.rpm
libssh-devel-0.9.4-2.el8.i686.rpm
libssh-devel-0.9.4-2.el8.x86_64.rpm
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
libssh-0.9.4-2.el8.src.rpm
aarch64:
libssh-0.9.4-2.el8.aarch64.rpm
libssh-debuginfo-0.9.4-2.el8.aarch64.rpm
libssh-debugsource-0.9.4-2.el8.aarch64.rpm
noarch:
libssh-config-0.9.4-2.el8.noarch.rpm
ppc64le:
libssh-0.9.4-2.el8.ppc64le.rpm
libssh-debuginfo-0.9.4-2.el8.ppc64le.rpm
libssh-debugsource-0.9.4-2.el8.ppc64le.rpm
s390x:
libssh-0.9.4-2.el8.s390x.rpm
libssh-debuginfo-0.9.4-2.el8.s390x.rpm
libssh-debugsource-0.9.4-2.el8.s390x.rpm
x86_64:
libssh-0.9.4-2.el8.i686.rpm
libssh-0.9.4-2.el8.x86_64.rpm
libssh-debuginfo-0.9.4-2.el8.i686.rpm
libssh-debuginfo-0.9.4-2.el8.x86_64.rpm
libssh-debugsource-0.9.4-2.el8.i686.rpm
libssh-debugsource-0.9.4-2.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-2019-14889
https://access.redhat.com/security/cve/CVE-2020-1730
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_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 2020 Red Hat, Inc.
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