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Red Hat Enterprise Linux 7 RHSA-2021:4788-01 Moderate: Krb5 Security Fix

red hat
Calendar Grey November 23, 2021
Dist Redhat Esm H88
A new version of krb5 has been released for Red Hat Enterprise Linux 7, classified as moderate. Check for release details and updates here.
An update for krb5 is now available for Red Hat Enterprise Linux 7

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: 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 moderate security fix red hat enterprise krb5 network authentication CVE-2021-37750

References

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

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: krb5-1.15.1-51.el7_9.src.rpm
x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm krb5-devel-1.15.1-51.el7_9.x86_64.rpm krb5-server-1.15.1-51.el7_9.x86_64.rpm krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: krb5-1.15.1-51.el7_9.src.rpm
x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:4788-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4788
Issue date: 2021-11-23

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 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 moderate security fix red hat enterprise krb5 network authentication CVE-2021-37750

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Bugs Fixed

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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