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Red Hat Security Advisory 2021-4782-01

Red Hat Security Advisory 2021-4782-01
Posted Nov 24, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4782-01 - OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Issues addressed include a privilege escalation vulnerability.

tags | advisory, protocol
systems | linux, redhat, unix
advisories | CVE-2021-41617
MD5 | 651c4bdb52f066e8bdc61fef27afbafc

Red Hat Security Advisory 2021-4782-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: openssh security update
Advisory ID: RHSA-2021:4782-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4782
Issue date: 2021-11-23
CVE Names: CVE-2021-41617
=====================================================================

1. Summary:

An update for openssh is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

OpenSSH is an SSH protocol implementation supported by a number of Linux,
UNIX, and similar operating systems. It includes the core files necessary
for both the OpenSSH client and server.

Security Fix(es):

* openssh: privilege escalation when AuthorizedKeysCommand or
AuthorizedPrincipalsCommand are configured (CVE-2021-41617)

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 this update, the OpenSSH server daemon (sshd) will be
restarted automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1999263 - frequent sshd segfaults
2008291 - CVE-2021-41617 openssh: privilege escalation when AuthorizedKeysCommand or AuthorizedPrincipalsCommand are configured

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
openssh-7.4p1-22.el7_9.src.rpm

x86_64:
openssh-7.4p1-22.el7_9.x86_64.rpm
openssh-askpass-7.4p1-22.el7_9.x86_64.rpm
openssh-clients-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-keycat-7.4p1-22.el7_9.x86_64.rpm
openssh-server-7.4p1-22.el7_9.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
openssh-cavs-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.i686.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-ldap-7.4p1-22.el7_9.x86_64.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.i686.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
openssh-7.4p1-22.el7_9.src.rpm

x86_64:
openssh-7.4p1-22.el7_9.x86_64.rpm
openssh-clients-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-keycat-7.4p1-22.el7_9.x86_64.rpm
openssh-server-7.4p1-22.el7_9.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
openssh-askpass-7.4p1-22.el7_9.x86_64.rpm
openssh-cavs-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.i686.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-ldap-7.4p1-22.el7_9.x86_64.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.i686.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
openssh-7.4p1-22.el7_9.src.rpm

ppc64:
openssh-7.4p1-22.el7_9.ppc64.rpm
openssh-askpass-7.4p1-22.el7_9.ppc64.rpm
openssh-clients-7.4p1-22.el7_9.ppc64.rpm
openssh-debuginfo-7.4p1-22.el7_9.ppc64.rpm
openssh-keycat-7.4p1-22.el7_9.ppc64.rpm
openssh-server-7.4p1-22.el7_9.ppc64.rpm

ppc64le:
openssh-7.4p1-22.el7_9.ppc64le.rpm
openssh-askpass-7.4p1-22.el7_9.ppc64le.rpm
openssh-clients-7.4p1-22.el7_9.ppc64le.rpm
openssh-debuginfo-7.4p1-22.el7_9.ppc64le.rpm
openssh-keycat-7.4p1-22.el7_9.ppc64le.rpm
openssh-server-7.4p1-22.el7_9.ppc64le.rpm

s390x:
openssh-7.4p1-22.el7_9.s390x.rpm
openssh-askpass-7.4p1-22.el7_9.s390x.rpm
openssh-clients-7.4p1-22.el7_9.s390x.rpm
openssh-debuginfo-7.4p1-22.el7_9.s390x.rpm
openssh-keycat-7.4p1-22.el7_9.s390x.rpm
openssh-server-7.4p1-22.el7_9.s390x.rpm

x86_64:
openssh-7.4p1-22.el7_9.x86_64.rpm
openssh-askpass-7.4p1-22.el7_9.x86_64.rpm
openssh-clients-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-keycat-7.4p1-22.el7_9.x86_64.rpm
openssh-server-7.4p1-22.el7_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
openssh-cavs-7.4p1-22.el7_9.ppc64.rpm
openssh-debuginfo-7.4p1-22.el7_9.ppc.rpm
openssh-debuginfo-7.4p1-22.el7_9.ppc64.rpm
openssh-ldap-7.4p1-22.el7_9.ppc64.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.ppc64.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.ppc.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.ppc64.rpm

ppc64le:
openssh-cavs-7.4p1-22.el7_9.ppc64le.rpm
openssh-debuginfo-7.4p1-22.el7_9.ppc64le.rpm
openssh-ldap-7.4p1-22.el7_9.ppc64le.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.ppc64le.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.ppc64le.rpm

s390x:
openssh-cavs-7.4p1-22.el7_9.s390x.rpm
openssh-debuginfo-7.4p1-22.el7_9.s390.rpm
openssh-debuginfo-7.4p1-22.el7_9.s390x.rpm
openssh-ldap-7.4p1-22.el7_9.s390x.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.s390x.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.s390.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.s390x.rpm

x86_64:
openssh-cavs-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.i686.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-ldap-7.4p1-22.el7_9.x86_64.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.i686.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
openssh-7.4p1-22.el7_9.src.rpm

x86_64:
openssh-7.4p1-22.el7_9.x86_64.rpm
openssh-askpass-7.4p1-22.el7_9.x86_64.rpm
openssh-clients-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-keycat-7.4p1-22.el7_9.x86_64.rpm
openssh-server-7.4p1-22.el7_9.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
openssh-cavs-7.4p1-22.el7_9.x86_64.rpm
openssh-debuginfo-7.4p1-22.el7_9.i686.rpm
openssh-debuginfo-7.4p1-22.el7_9.x86_64.rpm
openssh-ldap-7.4p1-22.el7_9.x86_64.rpm
openssh-server-sysvinit-7.4p1-22.el7_9.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.i686.rpm
pam_ssh_agent_auth-0.10.3-2.22.el7_9.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-2021-41617
https://access.redhat.com/security/updates/classification/#moderate

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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