Alerts This Week
Warning Icon 1 764
Alerts This Week
Warning Icon 1 764

Red Hat: RHSA-2021-1593-01 Moderate: Kerberos DoS Threat Update

red hat
Calendar Grey May 18, 2021
Dist Redhat Esm H88
Canonical released a timely security patch for OpenLDAP impacting Ubuntu 20.04, resolving a vulnerability linked to LDAP parsing that could lead to DoS attacks.
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: unbounded recursion via an ASN.1-encoded Kerberos message in lib/krb5/asn.1/asn1_encode.c may lead to DoS (CVE-2020-28196)
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 8.4 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat DoS Red Hat Enterprise Linux moderate severity authentication issue authentication krb5 Kerberos DoS

References

https://access.redhat.com/security/cve/CVE-2020-28196 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: krb5-1.18.2-8.el8.src.rpm
aarch64: krb5-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-debugsource-1.18.2-8.el8.aarch64.rpm krb5-devel-1.18.2-8.el8.aarch64.rpm krb5-devel-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-libs-1.18.2-8.el8.aarch64.rpm krb5-libs-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-pkinit-1.18.2-8.el8.aarch64.rpm krb5-pkinit-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-server-1.18.2-8.el8.aarch64.rpm krb5-server-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-server-ldap-1.18.2-8.el8.aarch64.rpm krb5-server-ldap-debuginfo-1.18.2-8.el8.aarch64.rpm krb5-workstation-1.18.2-8.el8.aarch64.rpm krb5-workstation-debuginfo-1.18.2-8.el8.aarch64.rpm libkadm5-1.18.2-8.el8.aarch64.rpm libkadm5-debuginfo-1.18.2-8.el8.aarch64.rpm
ppc64le: krb5-debuginfo-1.18.2-8.el8.ppc64le.rpm krb5-debugsource-1.18.2-8.el8.ppc64le.rpm krb5-devel-1.18.2-8.el8.ppc64le.rpm krb5-devel-debuginfo-1.18.2-8.el8.ppc64le.rpm krb5-libs-1.18.2-8.el8.ppc64le.rpm krb5-libs-debuginfo-1.18.2-8.el8.ppc64le.rpm krb5-pkinit-1.18.2-8.el8.ppc64le.rpm krb5-pkinit-debuginfo-1.18.2-8.el8.ppc64le.rpm krb5-server-1.18.2-8.el8.ppc64le.rpm krb5-server-debuginfo-1.18.2-8.el8.ppc64le.rpm krb5-server-ldap-1.18.2-8.el8.ppc64le.rpm krb5-server-ldap-debuginfo-1.18.2-8.el8.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:1593-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1593
Issue date: 2021-05-18

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 security update Red Hat DoS Red Hat Enterprise Linux moderate severity authentication issue authentication krb5 Kerberos DoS

Relevant Releases Architectures

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

Bugs Fixed

1835713 - krb5: typo error(s) in man page(s)

1868039 - krb5 spec file - wrong url in source0 and source1

1869055 - [doc] kvno usage not compliant with man page kvno(1)

1872689 - Radius Authentication does not work in FIPS mode

1901041 - CVE-2020-28196 krb5: unbounded recursion via an ASN.1-encoded Kerberos message in lib/krb5/asn.1/asn1_encode.c may lead to DoS

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here