ESB-2018.1099 - [RedHat] openssh: Create arbitrary files - Existing account 2018-04-11

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

                               ESB-2018.1099
          Low: openssh security, bug fix, and enhancement update
                               11 April 2018

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

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

Product:           openssh
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux WS/Desktop 7
Impact/Access:     Create Arbitrary Files -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-15906  

Reference:         ESB-2018.0895
                   ESB-2018.0230

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2018:0980

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

Synopsis:          Low: openssh security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:0980-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0980
Issue date:        2018-04-10
CVE Names:         CVE-2017-15906 
=====================================================================

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 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 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
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x

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: Improper write operations in readonly mode allow for zero-length
file creation (CVE-2017-15906)

For more details about the security issue(s), including the impact, a CVSS
score, 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 7.5 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 this update, the OpenSSH server daemon (sshd) will be
restarted automatically.

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

1456853 - ssh -Q and -G list host key types that are not allowed in FIPS mode
1478175 - The UseDNS configuration option changed default behaviour between 7.3 and 7.4, this breaks existing configurations until manually corrected
1480510 - SSH connections get closed when time-based rekeyring is used and ClientAliveMaxCount=0
1488083 - segfaults when cleaning up session due to some error
1488982 - GSSAPIStrictAcceptorCheck default change with 7.4
1494268 - pam_ssh_agent_auth SEGV's if keyfile is missing
1496467 - Regression: SSH AuthorizedKeysCommand hangs when output is too large
1496808 - OpenSSH 7.4 doesn't work with WinSCP >= 5.10 clients
1506630 - CVE-2017-15906 openssh: Improper write operations in readonly mode allow for zero-length file creation

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
openssh-7.4p1-16.el7.src.rpm

x86_64:
openssh-7.4p1-16.el7.x86_64.rpm
openssh-askpass-7.4p1-16.el7.x86_64.rpm
openssh-clients-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-keycat-7.4p1-16.el7.x86_64.rpm
openssh-server-7.4p1-16.el7.x86_64.rpm

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

x86_64:
openssh-cavs-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.i686.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-ldap-7.4p1-16.el7.x86_64.rpm
openssh-server-sysvinit-7.4p1-16.el7.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.i686.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
openssh-7.4p1-16.el7.src.rpm

x86_64:
openssh-7.4p1-16.el7.x86_64.rpm
openssh-clients-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-keycat-7.4p1-16.el7.x86_64.rpm
openssh-server-7.4p1-16.el7.x86_64.rpm

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

x86_64:
openssh-askpass-7.4p1-16.el7.x86_64.rpm
openssh-cavs-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.i686.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-ldap-7.4p1-16.el7.x86_64.rpm
openssh-server-sysvinit-7.4p1-16.el7.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.i686.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
openssh-7.4p1-16.el7.src.rpm

ppc64:
openssh-7.4p1-16.el7.ppc64.rpm
openssh-askpass-7.4p1-16.el7.ppc64.rpm
openssh-clients-7.4p1-16.el7.ppc64.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64.rpm
openssh-keycat-7.4p1-16.el7.ppc64.rpm
openssh-server-7.4p1-16.el7.ppc64.rpm

ppc64le:
openssh-7.4p1-16.el7.ppc64le.rpm
openssh-askpass-7.4p1-16.el7.ppc64le.rpm
openssh-clients-7.4p1-16.el7.ppc64le.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64le.rpm
openssh-keycat-7.4p1-16.el7.ppc64le.rpm
openssh-server-7.4p1-16.el7.ppc64le.rpm

s390x:
openssh-7.4p1-16.el7.s390x.rpm
openssh-askpass-7.4p1-16.el7.s390x.rpm
openssh-clients-7.4p1-16.el7.s390x.rpm
openssh-debuginfo-7.4p1-16.el7.s390x.rpm
openssh-keycat-7.4p1-16.el7.s390x.rpm
openssh-server-7.4p1-16.el7.s390x.rpm

x86_64:
openssh-7.4p1-16.el7.x86_64.rpm
openssh-askpass-7.4p1-16.el7.x86_64.rpm
openssh-clients-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-keycat-7.4p1-16.el7.x86_64.rpm
openssh-server-7.4p1-16.el7.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
openssh-7.4p1-16.el7.src.rpm

aarch64:
openssh-7.4p1-16.el7.aarch64.rpm
openssh-askpass-7.4p1-16.el7.aarch64.rpm
openssh-clients-7.4p1-16.el7.aarch64.rpm
openssh-debuginfo-7.4p1-16.el7.aarch64.rpm
openssh-keycat-7.4p1-16.el7.aarch64.rpm
openssh-server-7.4p1-16.el7.aarch64.rpm

ppc64le:
openssh-7.4p1-16.el7.ppc64le.rpm
openssh-askpass-7.4p1-16.el7.ppc64le.rpm
openssh-clients-7.4p1-16.el7.ppc64le.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64le.rpm
openssh-keycat-7.4p1-16.el7.ppc64le.rpm
openssh-server-7.4p1-16.el7.ppc64le.rpm

s390x:
openssh-7.4p1-16.el7.s390x.rpm
openssh-askpass-7.4p1-16.el7.s390x.rpm
openssh-clients-7.4p1-16.el7.s390x.rpm
openssh-debuginfo-7.4p1-16.el7.s390x.rpm
openssh-keycat-7.4p1-16.el7.s390x.rpm
openssh-server-7.4p1-16.el7.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
openssh-cavs-7.4p1-16.el7.aarch64.rpm
openssh-debuginfo-7.4p1-16.el7.aarch64.rpm
openssh-ldap-7.4p1-16.el7.aarch64.rpm
openssh-server-sysvinit-7.4p1-16.el7.aarch64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.aarch64.rpm

ppc64le:
openssh-cavs-7.4p1-16.el7.ppc64le.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64le.rpm
openssh-ldap-7.4p1-16.el7.ppc64le.rpm
openssh-server-sysvinit-7.4p1-16.el7.ppc64le.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.ppc64le.rpm

s390x:
openssh-cavs-7.4p1-16.el7.s390x.rpm
openssh-debuginfo-7.4p1-16.el7.s390.rpm
openssh-debuginfo-7.4p1-16.el7.s390x.rpm
openssh-ldap-7.4p1-16.el7.s390x.rpm
openssh-server-sysvinit-7.4p1-16.el7.s390x.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.s390.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.s390x.rpm

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

ppc64:
openssh-cavs-7.4p1-16.el7.ppc64.rpm
openssh-debuginfo-7.4p1-16.el7.ppc.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64.rpm
openssh-ldap-7.4p1-16.el7.ppc64.rpm
openssh-server-sysvinit-7.4p1-16.el7.ppc64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.ppc.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.ppc64.rpm

ppc64le:
openssh-cavs-7.4p1-16.el7.ppc64le.rpm
openssh-debuginfo-7.4p1-16.el7.ppc64le.rpm
openssh-ldap-7.4p1-16.el7.ppc64le.rpm
openssh-server-sysvinit-7.4p1-16.el7.ppc64le.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.ppc64le.rpm

s390x:
openssh-cavs-7.4p1-16.el7.s390x.rpm
openssh-debuginfo-7.4p1-16.el7.s390.rpm
openssh-debuginfo-7.4p1-16.el7.s390x.rpm
openssh-ldap-7.4p1-16.el7.s390x.rpm
openssh-server-sysvinit-7.4p1-16.el7.s390x.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.s390.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.s390x.rpm

x86_64:
openssh-cavs-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.i686.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-ldap-7.4p1-16.el7.x86_64.rpm
openssh-server-sysvinit-7.4p1-16.el7.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.i686.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
openssh-7.4p1-16.el7.src.rpm

x86_64:
openssh-7.4p1-16.el7.x86_64.rpm
openssh-askpass-7.4p1-16.el7.x86_64.rpm
openssh-clients-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-keycat-7.4p1-16.el7.x86_64.rpm
openssh-server-7.4p1-16.el7.x86_64.rpm

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

x86_64:
openssh-cavs-7.4p1-16.el7.x86_64.rpm
openssh-debuginfo-7.4p1-16.el7.i686.rpm
openssh-debuginfo-7.4p1-16.el7.x86_64.rpm
openssh-ldap-7.4p1-16.el7.x86_64.rpm
openssh-server-sysvinit-7.4p1-16.el7.x86_64.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.i686.rpm
pam_ssh_agent_auth-0.10.3-2.16.el7.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-2017-15906
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/7/html/7.5_release_notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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