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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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