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Red Hat Security Advisory 2020-4545-01

Red Hat Security Advisory 2020-4545-01
Posted Nov 4, 2020
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2020-4545-01 - libssh is a library which implements the SSH protocol. It can be used to implement client and server applications. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service, protocol
systems | linux, redhat
advisories | CVE-2019-14889, CVE-2020-1730
SHA-256 | 8266b40d92587d01b62286014494ce95a27da338a1ca045c7a7bc5fa8616ef0d

Red Hat Security Advisory 2020-4545-01

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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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