5.8 - RHSA-2019:3702

Problem Description:

An update for openssh is now available for Red Hat Enterprise Linux 8.

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 AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, 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.

The following packages have been upgraded to a later upstream version: openssh (8.0p1). (BZ#1691045)

Security Fix(es):

* openssh: scp client improper directory name validation (CVE-2018-20685)

* openssh: Improper validation of object names allows malicious server to overwrite files via scp client (CVE-2019-6111)

* openssh: Missing character encoding in progress display allows for spoofing of scp client output (CVE-2019-6109)

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 8.1 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/):

1665785 - CVE-2018-20685 openssh: scp client improper directory name validation 1666119 - CVE-2019-6109 openssh: Missing character encoding in progress display allows for spoofing of scp client output 1666127 - CVE-2019-6111 openssh: Improper validation of object names allows malicious server to overwrite files via scp client 1667519 - ssh-copy-id hangs when the remote system is out of space 1668325 - openssh - man pages do not mention crypto-policies 1683295 - Kerberos cleanup procedures do not work with GSSAPIDelegateCredentials and default ccache from krb5.conf 1685096 - In FIPS mode, during DH group exchange, OpenSSH client should validate the received moduli, making sure it is one of the known groups. 1686065 - SSH connections get closed when time-based rekeyring is used and ClientAliveMaxCount=0 1691045 - Rebase OpenSSH to latest release (8.0p1?) 1707485 - Use high-level API to do signatures 1712436 - MD5 is used when writing password protected PEM 1732424 - ssh-keygen -A fails in FIPS mode because of DSA key 1732449 - rsa-sha2-*-cert-v01@openssh.com host key types are ignored in FIPS despite being in the policy