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Red Hat Enterprise Linux 7: RHSA-2018:0666-01 Moderate: krb5 Auth Problems

red hat
Calendar Grey April 10, 2018
Scroller Redhat
Debian releases a security notice regarding openssl with significant implications, featuring patches and enhancements for cryptographic protocols.
An update for krb5 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 the updated packages, running Kerberos services (krb5kdc, kadmin, and kprop) will be restarted automatically.

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.

Topics%20covered

Topics Covered

security advisory network security Red Hat bug fix moderate impact authentication issue krb5

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://docs.redhat.com/en/documentation/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

Read the Full Advisory


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

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.

Topics%20covered

Topics Covered

security advisory network security Red Hat bug fix moderate impact authentication issue krb5

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

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