Moderate: krb5 security update

Related Vulnerabilities: CVE-2020-17049   CVE-2023-5455  

Synopsis

Moderate: krb5 security update

Type/Severity

Security Advisory: Moderate

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Topic

An update for krb5 is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.

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.

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):

  • Kerberos: delegation constrain bypass in S4U2Proxy (CVE-2020-17049)
  • ipa: Invalid CSRF protection (CVE-2023-5455)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in 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 for x86_64 - Extended Update Support 8.6 x86_64
  • Red Hat Enterprise Linux Server - AUS 8.6 x86_64
  • Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
  • Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
  • Red Hat Enterprise Linux Server - TUS 8.6 x86_64
  • Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
  • Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
  • Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64

Fixes

  • BZ - 2025721 - CVE-2020-17049 Kerberos: delegation constrain bypass in S4U2Proxy
  • BZ - 2242828 - CVE-2023-5455 ipa: Invalid CSRF protection
  • RHEL-17108 - CVE-2022-37967: MS-PAC extended KDC signature [rhel-8.6.0.z]