[RHSA-2016:0741-01] Moderate: openssh security, bug fix, and enhancement update

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Red Hat Security Advisory

 

Synopsis: Moderate: openssh security, bug fix, and enhancement update

Advisory ID: RHSA-2016:0741-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0741.html

Issue date: 2016-05-10

CVE Names: CVE-2015-5352 CVE-2015-6563 CVE-2015-6564

CVE-2016-1908

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1. Summary:

 

An update for openssh is now available for Red Hat Enterprise Linux 6.

 

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 Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, 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):

 

* It was found that the OpenSSH client did not properly enforce the

ForwardX11Timeout setting. A malicious or compromised remote X application

could possibly use this flaw to establish a trusted connection to the local

X server, even if only untrusted X11 forwarding was requested.

(CVE-2015-5352)

 

* A flaw was found in the way OpenSSH handled PAM authentication when using

privilege separation. An attacker with valid credentials on the system and

able to fully compromise a non-privileged pre-authentication process using

a different flaw could use this flaw to authenticate as other users.

(CVE-2015-6563)

 

* A use-after-free flaw was found in OpenSSH. An attacker able to fully

compromise a non-privileged pre-authentication process using a different

flaw could possibly cause sshd to crash or execute arbitrary code with root

privileges. (CVE-2015-6564)

 

* An access flaw was discovered in OpenSSH; the OpenSSH client did not

correctly handle failures to generate authentication cookies for untrusted

X11 forwarding. A malicious or compromised remote X application could

possibly use this flaw to establish a trusted connection to the local X

server, even if only untrusted X11 forwarding was requested.

(CVE-2016-1908)

 

For detailed information on changes in this release, see the Red Hat

Enterprise Linux 6.8 Release Notes and Red Hat Enterprise Linux 6.8

Technical 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/):

 

1211673 - [RFE] Backport Match LocalAddress from OpenSSH 6.1 (and later)

1218070 - ECDSA host key not loaded by sshd by default (inconsistent with man page)

1219820 - Lack of clarity of Match block processing and RequiredAuthentications2 limitation

1238231 - CVE-2015-5352 openssh: XSECURITY restrictions bypass under certain conditions in ssh(1)

1252844 - CVE-2015-6563 openssh: Privilege separation weakness related to PAM support

1252852 - CVE-2015-6564 openssh: Use-after-free bug related to PAM support

1298741 - CVE-2016-1908 openssh: possible fallback from untrusted to trusted X11 forwarding

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

openssh-5.3p1-117.el6.src.rpm

 

i386:

openssh-5.3p1-117.el6.i686.rpm

openssh-askpass-5.3p1-117.el6.i686.rpm

openssh-clients-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-server-5.3p1-117.el6.i686.rpm

 

x86_64:

openssh-5.3p1-117.el6.x86_64.rpm

openssh-askpass-5.3p1-117.el6.x86_64.rpm

openssh-clients-5.3p1-117.el6.x86_64.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-server-5.3p1-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux Desktop Optional (v. 6):

 

i386:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-ldap-5.3p1-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

 

x86_64:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-ldap-5.3p1-117.el6.x86_64.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node (v. 6):

 

Source:

openssh-5.3p1-117.el6.src.rpm

 

x86_64:

openssh-5.3p1-117.el6.x86_64.rpm

openssh-clients-5.3p1-117.el6.x86_64.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-server-5.3p1-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node Optional (v. 6):

 

x86_64:

openssh-askpass-5.3p1-117.el6.x86_64.rpm

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-ldap-5.3p1-117.el6.x86_64.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

openssh-5.3p1-117.el6.src.rpm

 

i386:

openssh-5.3p1-117.el6.i686.rpm

openssh-askpass-5.3p1-117.el6.i686.rpm

openssh-clients-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-server-5.3p1-117.el6.i686.rpm

 

ppc64:

openssh-5.3p1-117.el6.ppc64.rpm

openssh-askpass-5.3p1-117.el6.ppc64.rpm

openssh-clients-5.3p1-117.el6.ppc64.rpm

openssh-debuginfo-5.3p1-117.el6.ppc64.rpm

openssh-server-5.3p1-117.el6.ppc64.rpm

 

s390x:

openssh-5.3p1-117.el6.s390x.rpm

openssh-askpass-5.3p1-117.el6.s390x.rpm

openssh-clients-5.3p1-117.el6.s390x.rpm

openssh-debuginfo-5.3p1-117.el6.s390x.rpm

openssh-server-5.3p1-117.el6.s390x.rpm

 

x86_64:

openssh-5.3p1-117.el6.x86_64.rpm

openssh-askpass-5.3p1-117.el6.x86_64.rpm

openssh-clients-5.3p1-117.el6.x86_64.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-server-5.3p1-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 6):

 

i386:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-ldap-5.3p1-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

 

ppc64:

openssh-debuginfo-5.3p1-117.el6.ppc.rpm

openssh-debuginfo-5.3p1-117.el6.ppc64.rpm

openssh-ldap-5.3p1-117.el6.ppc64.rpm

pam_ssh_agent_auth-0.9.3-117.el6.ppc.rpm

pam_ssh_agent_auth-0.9.3-117.el6.ppc64.rpm

 

s390x:

openssh-debuginfo-5.3p1-117.el6.s390.rpm

openssh-debuginfo-5.3p1-117.el6.s390x.rpm

openssh-ldap-5.3p1-117.el6.s390x.rpm

pam_ssh_agent_auth-0.9.3-117.el6.s390.rpm

pam_ssh_agent_auth-0.9.3-117.el6.s390x.rpm

 

x86_64:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-ldap-5.3p1-117.el6.x86_64.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

openssh-5.3p1-117.el6.src.rpm

 

i386:

openssh-5.3p1-117.el6.i686.rpm

openssh-askpass-5.3p1-117.el6.i686.rpm

openssh-clients-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-server-5.3p1-117.el6.i686.rpm

 

x86_64:

openssh-5.3p1-117.el6.x86_64.rpm

openssh-askpass-5.3p1-117.el6.x86_64.rpm

openssh-clients-5.3p1-117.el6.x86_64.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-server-5.3p1-117.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 6):

 

i386:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-ldap-5.3p1-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

 

x86_64:

openssh-debuginfo-5.3p1-117.el6.i686.rpm

openssh-debuginfo-5.3p1-117.el6.x86_64.rpm

openssh-ldap-5.3p1-117.el6.x86_64.rpm

pam_ssh_agent_auth-0.9.3-117.el6.i686.rpm

pam_ssh_agent_auth-0.9.3-117.el6.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-2015-5352

https://access.redhat.com/security/cve/CVE-2015-6563

https://access.redhat.com/security/cve/CVE-2015-6564

https://access.redhat.com/security/cve/CVE-2016-1908

https://access.redhat.com/security/updates/classification/#moderate

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.8_Release_Notes/index.html

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.8_Technical_Notes/index.html

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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