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

Synopsis:          Moderate: krb5 security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:0666-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0666
Issue date:        2018-04-10
CVE Names:         CVE-2017-7562 CVE-2017-11368 
=====================================================================

1. Summary:

An update for krb5 is now available for Red Hat Enterprise Linux 7.

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 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 Workstation (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x

3. Description:

Kerberos is a network authentication system, which can improve the security
of your network by eliminating the insecure practice of sending passwords
over the network in unencrypted form. It allows clients and servers to
authenticate to each other with the help of a trusted third party, the
Kerberos key distribution center (KDC).

Security Fix(es):

* krb5: Authentication bypass by improper validation of certificate EKU and
SAN (CVE-2017-7562)

* krb5: Invalid S4U2Self or S4U2Proxy request causes assertion failure
(CVE-2017-11368)

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 the updated packages, running Kerberos services (krb5kdc,
kadmin, and kprop) will be restarted automatically.

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

1431198 - automatically add 'includedir /etc/krb5.conf.d/' to  krb5.conf on update
1443388 - Please add the changes needed for the t_certauth.py test
1472956 - Add support to query the SSF of a context
1473560 - CVE-2017-11368 krb5: Invalid S4U2Self or S4U2Proxy request causes assertion failure
1485510 - CVE-2017-7562 krb5: Authentication bypass by improper validation of certificate EKU and SAN

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
krb5-1.15.1-18.el7.src.rpm

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-libs-1.15.1-18.el7.i686.rpm
krb5-libs-1.15.1-18.el7.x86_64.rpm
krb5-pkinit-1.15.1-18.el7.x86_64.rpm
krb5-workstation-1.15.1-18.el7.x86_64.rpm
libkadm5-1.15.1-18.el7.i686.rpm
libkadm5-1.15.1-18.el7.x86_64.rpm

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

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-devel-1.15.1-18.el7.i686.rpm
krb5-devel-1.15.1-18.el7.x86_64.rpm
krb5-server-1.15.1-18.el7.x86_64.rpm
krb5-server-ldap-1.15.1-18.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
krb5-1.15.1-18.el7.src.rpm

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-libs-1.15.1-18.el7.i686.rpm
krb5-libs-1.15.1-18.el7.x86_64.rpm
krb5-pkinit-1.15.1-18.el7.x86_64.rpm
krb5-workstation-1.15.1-18.el7.x86_64.rpm
libkadm5-1.15.1-18.el7.i686.rpm
libkadm5-1.15.1-18.el7.x86_64.rpm

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

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-devel-1.15.1-18.el7.i686.rpm
krb5-devel-1.15.1-18.el7.x86_64.rpm
krb5-server-1.15.1-18.el7.x86_64.rpm
krb5-server-ldap-1.15.1-18.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
krb5-1.15.1-18.el7.src.rpm

ppc64:
krb5-debuginfo-1.15.1-18.el7.ppc.rpm
krb5-debuginfo-1.15.1-18.el7.ppc64.rpm
krb5-devel-1.15.1-18.el7.ppc.rpm
krb5-devel-1.15.1-18.el7.ppc64.rpm
krb5-libs-1.15.1-18.el7.ppc.rpm
krb5-libs-1.15.1-18.el7.ppc64.rpm
krb5-pkinit-1.15.1-18.el7.ppc64.rpm
krb5-server-1.15.1-18.el7.ppc64.rpm
krb5-server-ldap-1.15.1-18.el7.ppc64.rpm
krb5-workstation-1.15.1-18.el7.ppc64.rpm
libkadm5-1.15.1-18.el7.ppc.rpm
libkadm5-1.15.1-18.el7.ppc64.rpm

ppc64le:
krb5-debuginfo-1.15.1-18.el7.ppc64le.rpm
krb5-devel-1.15.1-18.el7.ppc64le.rpm
krb5-libs-1.15.1-18.el7.ppc64le.rpm
krb5-pkinit-1.15.1-18.el7.ppc64le.rpm
krb5-server-1.15.1-18.el7.ppc64le.rpm
krb5-server-ldap-1.15.1-18.el7.ppc64le.rpm
krb5-workstation-1.15.1-18.el7.ppc64le.rpm
libkadm5-1.15.1-18.el7.ppc64le.rpm

s390x:
krb5-debuginfo-1.15.1-18.el7.s390.rpm
krb5-debuginfo-1.15.1-18.el7.s390x.rpm
krb5-devel-1.15.1-18.el7.s390.rpm
krb5-devel-1.15.1-18.el7.s390x.rpm
krb5-libs-1.15.1-18.el7.s390.rpm
krb5-libs-1.15.1-18.el7.s390x.rpm
krb5-pkinit-1.15.1-18.el7.s390x.rpm
krb5-server-1.15.1-18.el7.s390x.rpm
krb5-server-ldap-1.15.1-18.el7.s390x.rpm
krb5-workstation-1.15.1-18.el7.s390x.rpm
libkadm5-1.15.1-18.el7.s390.rpm
libkadm5-1.15.1-18.el7.s390x.rpm

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-devel-1.15.1-18.el7.i686.rpm
krb5-devel-1.15.1-18.el7.x86_64.rpm
krb5-libs-1.15.1-18.el7.i686.rpm
krb5-libs-1.15.1-18.el7.x86_64.rpm
krb5-pkinit-1.15.1-18.el7.x86_64.rpm
krb5-server-1.15.1-18.el7.x86_64.rpm
krb5-server-ldap-1.15.1-18.el7.x86_64.rpm
krb5-workstation-1.15.1-18.el7.x86_64.rpm
libkadm5-1.15.1-18.el7.i686.rpm
libkadm5-1.15.1-18.el7.x86_64.rpm

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

Source:
krb5-1.15.1-18.el7.src.rpm

aarch64:
krb5-debuginfo-1.15.1-18.el7.aarch64.rpm
krb5-devel-1.15.1-18.el7.aarch64.rpm
krb5-libs-1.15.1-18.el7.aarch64.rpm
krb5-pkinit-1.15.1-18.el7.aarch64.rpm
krb5-server-1.15.1-18.el7.aarch64.rpm
krb5-server-ldap-1.15.1-18.el7.aarch64.rpm
krb5-workstation-1.15.1-18.el7.aarch64.rpm
libkadm5-1.15.1-18.el7.aarch64.rpm

ppc64le:
krb5-debuginfo-1.15.1-18.el7.ppc64le.rpm
krb5-devel-1.15.1-18.el7.ppc64le.rpm
krb5-libs-1.15.1-18.el7.ppc64le.rpm
krb5-pkinit-1.15.1-18.el7.ppc64le.rpm
krb5-server-1.15.1-18.el7.ppc64le.rpm
krb5-server-ldap-1.15.1-18.el7.ppc64le.rpm
krb5-workstation-1.15.1-18.el7.ppc64le.rpm
libkadm5-1.15.1-18.el7.ppc64le.rpm

s390x:
krb5-debuginfo-1.15.1-18.el7.s390.rpm
krb5-debuginfo-1.15.1-18.el7.s390x.rpm
krb5-devel-1.15.1-18.el7.s390.rpm
krb5-devel-1.15.1-18.el7.s390x.rpm
krb5-libs-1.15.1-18.el7.s390.rpm
krb5-libs-1.15.1-18.el7.s390x.rpm
krb5-pkinit-1.15.1-18.el7.s390x.rpm
krb5-server-1.15.1-18.el7.s390x.rpm
krb5-server-ldap-1.15.1-18.el7.s390x.rpm
krb5-workstation-1.15.1-18.el7.s390x.rpm
libkadm5-1.15.1-18.el7.s390.rpm
libkadm5-1.15.1-18.el7.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
krb5-1.15.1-18.el7.src.rpm

x86_64:
krb5-debuginfo-1.15.1-18.el7.i686.rpm
krb5-debuginfo-1.15.1-18.el7.x86_64.rpm
krb5-devel-1.15.1-18.el7.i686.rpm
krb5-devel-1.15.1-18.el7.x86_64.rpm
krb5-libs-1.15.1-18.el7.i686.rpm
krb5-libs-1.15.1-18.el7.x86_64.rpm
krb5-pkinit-1.15.1-18.el7.x86_64.rpm
krb5-server-1.15.1-18.el7.x86_64.rpm
krb5-server-ldap-1.15.1-18.el7.x86_64.rpm
krb5-workstation-1.15.1-18.el7.x86_64.rpm
libkadm5-1.15.1-18.el7.i686.rpm
libkadm5-1.15.1-18.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-2017-7562
https://access.redhat.com/security/cve/CVE-2017-11368
https://access.redhat.com/security/updates/classification/#moderate
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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