RedHat: RHSA-2018-0666:01 Moderate: krb5 security, bug fix,
Summary
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.
Summary
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.
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
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/
Topic
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 impactof Moderate. 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.
Topic
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
Bugs Fixed
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