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 impact of Low. 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.

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: null dereference in kadmind or DN container check bypass by supplying special crafted data (CVE-2018-5729)
• krb5: DN container check bypass by supplying special crafted data (CVE-2018-5730)

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 7.6 Release Notes linked from the References section.

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.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1373909 - Running systemctl stop kadmin.service causes the status to be failed instead of inactive
• BZ - 1497301 - [RFE] Add German translation (de_DE.UTF-8)
• BZ - 1525232 - Fix network service dependencies
• BZ - 1538491 - certid option of PKINIT plugin does not handle leading zeros
• BZ - 1539824 - Order of processing for files in included directories is undefined
• BZ - 1540130 - [RFE] make preauth types more descriptive in krb5 trace
• BZ - 1551082 - CVE-2018-5730 krb5: DN container check bypass by supplying special crafted data
• BZ - 1551083 - CVE-2018-5729 krb5: null dereference in kadmind or DN container check bypass by supplying special crafted data
• BZ - 1563166 - kdestroy -A does not work with multiple principals when using KCM
• BZ - 1570600 - krb5-libs uses slow crypto implementation
• BZ - 1599721 - ipa-server-install fails when FIPS mode is enabled

CVEs

• CVE-2018-5729
• CVE-2018-5730

References

• https://access.redhat.com/security/updates/classification/#low
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.6_release_notes/index