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RedHat: RHSA-2019-2143-01 Low: OpenSSH Authentication Issue

red hat
Calendar Grey August 6, 2019
Dist Redhat Esm H88
The latest release from Red Hat for OpenSSH tackles a minor authentication flaw through an important fix aimed at Linux version 7.
An update for openssh is now available for Red Hat Enterprise Linux 7

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.

Summary

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: User enumeration via malformed packets in authentication requests (CVE-2018-15473)
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 7.7 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory bug fix authentication issue openssh redhat low

References

https://access.redhat.com/security/cve/CVE-2018-15473 https://access.redhat.com/security/updates/classification/#low https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: openssh-7.4p1-21.el7.src.rpm
x86_64: openssh-7.4p1-21.el7.x86_64.rpm openssh-askpass-7.4p1-21.el7.x86_64.rpm openssh-clients-7.4p1-21.el7.x86_64.rpm openssh-debuginfo-7.4p1-21.el7.x86_64.rpm openssh-keycat-7.4p1-21.el7.x86_64.rpm openssh-server-7.4p1-21.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: openssh-cavs-7.4p1-21.el7.x86_64.rpm openssh-debuginfo-7.4p1-21.el7.i686.rpm openssh-debuginfo-7.4p1-21.el7.x86_64.rpm openssh-ldap-7.4p1-21.el7.x86_64.rpm openssh-server-sysvinit-7.4p1-21.el7.x86_64.rpm pam_ssh_agent_auth-0.10.3-2.21.el7.i686.rpm pam_ssh_agent_auth-0.10.3-2.21.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: openssh-7.4p1-21.el7.src.rpm
x86_64: openssh-7.4p1-21.el7.x86_64.rpm openssh-clients-7.4p1-21.el7.x86_64.rpm openssh-debuginfo-7.4p1-21.el7.x86_64.rpm openssh-keycat-7.4p1-21.el7.x86_64.rpm openssh-server-7.4p1-21.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: openssh-askpass-7.4p1-21.el7.x86_64.rpm openssh-cavs-7.4p1-21.el7.x86_64.rpm openssh-debuginfo-7.4p1-21.el7.i686.rpm openssh-debuginfo-7.4p1-21.el7.x86_64.rpm openssh-ldap-7.4p1-21.el7.x86_64.rpm openssh-server-sysvinit-7.4p1-21.el7.x86_64.rpm pam_ssh_agent_auth-0.10.3-2.21.el7.i686.rpm

Read the Full Advisory


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2019:2143-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2143
Issue date: 2019-08-06

Topic

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 impactof Low. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory bug fix authentication issue openssh redhat low

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

Bugs Fixed

1583735 - Permission denied reading authorized_keys when setting AuthorizedKeysCommand

1619063 - CVE-2018-15473 openssh: User enumeration via malformed packets in authentication requests

1712053 - tmux session not attached automatically during manual installation on s390x

1722446 - openssh FIPS cipher list has an extra comma in it

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