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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3975
                          openssh security update
                             24 November 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           openssh
Publisher:         Red Hat
Operating System:  Red Hat
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-41617  

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2021:4782

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Red Hat. It is recommended that administrators
         running openssh check for an updated version of the software for 
         their operating system.

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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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