RedHat: RHSA-2021-3576:01 Moderate: krb5 security update
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.
Summary
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.
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
krb5-server-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm
krb5-server-ldap-1.18.2-8.3.el8_4.ppc64le.rpm
krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm
krb5-workstation-1.18.2-8.3.el8_4.ppc64le.rpm
krb5-workstation-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm
libkadm5-1.18.2-8.3.el8_4.ppc64le.rpm
libkadm5-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm
s390x:
krb5-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-debugsource-1.18.2-8.3.el8_4.s390x.rpm
krb5-devel-1.18.2-8.3.el8_4.s390x.rpm
krb5-devel-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-libs-1.18.2-8.3.el8_4.s390x.rpm
krb5-libs-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-pkinit-1.18.2-8.3.el8_4.s390x.rpm
krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-server-1.18.2-8.3.el8_4.s390x.rpm
krb5-server-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-server-ldap-1.18.2-8.3.el8_4.s390x.rpm
krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
krb5-workstation-1.18.2-8.3.el8_4.s390x.rpm
krb5-workstation-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
libkadm5-1.18.2-8.3.el8_4.s390x.rpm
libkadm5-debuginfo-1.18.2-8.3.el8_4.s390x.rpm
x86_64:
krb5-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-debugsource-1.18.2-8.3.el8_4.i686.rpm
krb5-debugsource-1.18.2-8.3.el8_4.x86_64.rpm
krb5-devel-1.18.2-8.3.el8_4.i686.rpm
krb5-devel-1.18.2-8.3.el8_4.x86_64.rpm
krb5-devel-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-devel-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-libs-1.18.2-8.3.el8_4.i686.rpm
krb5-libs-1.18.2-8.3.el8_4.x86_64.rpm
krb5-libs-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-libs-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-pkinit-1.18.2-8.3.el8_4.i686.rpm
krb5-pkinit-1.18.2-8.3.el8_4.x86_64.rpm
krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-server-1.18.2-8.3.el8_4.i686.rpm
krb5-server-1.18.2-8.3.el8_4.x86_64.rpm
krb5-server-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-server-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-server-ldap-1.18.2-8.3.el8_4.i686.rpm
krb5-server-ldap-1.18.2-8.3.el8_4.x86_64.rpm
krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
krb5-workstation-1.18.2-8.3.el8_4.x86_64.rpm
krb5-workstation-debuginfo-1.18.2-8.3.el8_4.i686.rpm
krb5-workstation-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
libkadm5-1.18.2-8.3.el8_4.i686.rpm
libkadm5-1.18.2-8.3.el8_4.x86_64.rpm
libkadm5-debuginfo-1.18.2-8.3.el8_4.i686.rpm
libkadm5-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
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.
Topic
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