Moderate: krb5 security and bug fix update

Topic

An update for krb5 is now available for Red Hat Enterprise Linux 9.

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):

• krb5: Denial of service through freeing uninitialized pointer (CVE-2023-36054)
• krb5: double-free in KDC TGS processing (CVE-2023-39975)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.3 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 for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

• BZ - 2060421 - Invalid KDC signature encryption type for PAC [rhel-9]
• BZ - 2155607 - PKINIT: CMS SHA-1 signature verification cannot be allowed in FIPS mode
• BZ - 2178298 - Make ticket signature optional during PAC verification [rhel-9]
• BZ - 2187722 - PKINIT module initialization fails if a well-known MODP group cannot be loaded [rhel-9]
• BZ - 2230178 - CVE-2023-36054 krb5: Denial of service through freeing uninitialized pointer
• BZ - 2232682 - CVE-2023-39975 krb5: double-free in KDC TGS processing

CVEs

• CVE-2023-36054
• CVE-2023-39975

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/9.3_release_notes/index