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Red Hat Enterprise Linux 8: RHSA-2021:3576-01 Moderate: krb5 DoS Risk

red hat
Calendar Grey September 21, 2021
Dist Redhat Esm H88
Oracle has released a significant advisory about OpenSSL. Update immediately to prevent possible security issues and threats.
An update for krb5 is now available for Red Hat Enterprise Linux 8

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: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS (CVE-2021-36222)
* krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field (CVE-2021-37750)
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.

Topics%20covered

Topics Covered

security advisory Red Hat moderate severity krb5 update DoS risk

References

https://access.redhat.com/security/cve/CVE-2021-36222 https://access.redhat.com/security/cve/CVE-2021-37750 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: krb5-1.18.2-8.3.el8_4.src.rpm
aarch64: krb5-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-debugsource-1.18.2-8.3.el8_4.aarch64.rpm krb5-devel-1.18.2-8.3.el8_4.aarch64.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-libs-1.18.2-8.3.el8_4.aarch64.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-pkinit-1.18.2-8.3.el8_4.aarch64.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-ldap-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-workstation-1.18.2-8.3.el8_4.aarch64.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm libkadm5-1.18.2-8.3.el8_4.aarch64.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm
ppc64le: krb5-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-debugsource-1.18.2-8.3.el8_4.ppc64le.rpm krb5-devel-1.18.2-8.3.el8_4.ppc64le.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-libs-1.18.2-8.3.el8_4.ppc64le.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-pkinit-1.18.2-8.3.el8_4.ppc64le.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-server-1.18.2-8.3.el8_4.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:3576-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3576
Issue date: 2021-09-21

Topic

An update for krb5 is now available for Red Hat Enterprise Linux 8.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 Red Hat moderate severity krb5 update DoS risk

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1983720 - CVE-2021-36222 krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS

1996834 - CVE-2021-37750 krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field

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