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Oracle Linux: CVE-2020-17049: ELSA-2023-2570: krb5 security, bug fix, and enhancement update (MODERATE) (Multiple Advisories)

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Oracle Linux: CVE-2020-17049: ELSA-2023-2570: krb5 security, bug fix, and enhancement update (MODERATE) (Multiple Advisories)

Severity
8
CVSS
(AV:N/AC:L/Au:M/C:C/I:C/A:C)
Published
11/10/2020
Created
05/18/2023
Added
10/16/2024
Modified
10/17/2024

Description

A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD. It was found that the Kerberos Key Distribution Center (KDC) delegation feature, Service for User (S4U), did not sufficiently protect the tickets it's providing from tempering. A malicious, authenticated service principal allowed to delegate could use this flaw to impersonate a non-forwardable user.

Solution(s)

  • oracle-linux-upgrade-bind-dyndb-ldap
  • oracle-linux-upgrade-custodia
  • oracle-linux-upgrade-ipa-client
  • oracle-linux-upgrade-ipa-client-common
  • oracle-linux-upgrade-ipa-client-epn
  • oracle-linux-upgrade-ipa-client-samba
  • oracle-linux-upgrade-ipa-common
  • oracle-linux-upgrade-ipa-healthcheck
  • oracle-linux-upgrade-ipa-healthcheck-core
  • oracle-linux-upgrade-ipa-python-compat
  • oracle-linux-upgrade-ipa-selinux
  • oracle-linux-upgrade-ipa-server
  • oracle-linux-upgrade-ipa-server-common
  • oracle-linux-upgrade-ipa-server-dns
  • oracle-linux-upgrade-ipa-server-trust-ad
  • oracle-linux-upgrade-krb5-devel
  • oracle-linux-upgrade-krb5-libs
  • oracle-linux-upgrade-krb5-pkinit
  • oracle-linux-upgrade-krb5-server
  • oracle-linux-upgrade-krb5-server-ldap
  • oracle-linux-upgrade-krb5-workstation
  • oracle-linux-upgrade-libkadm5
  • oracle-linux-upgrade-opendnssec
  • oracle-linux-upgrade-python3-custodia
  • oracle-linux-upgrade-python3-ipaclient
  • oracle-linux-upgrade-python3-ipalib
  • oracle-linux-upgrade-python3-ipaserver
  • oracle-linux-upgrade-python3-ipatests
  • oracle-linux-upgrade-python3-jwcrypto
  • oracle-linux-upgrade-python3-kdcproxy
  • oracle-linux-upgrade-python3-pyusb
  • oracle-linux-upgrade-python3-qrcode
  • oracle-linux-upgrade-python3-qrcode-core
  • oracle-linux-upgrade-python3-yubico
  • oracle-linux-upgrade-slapi-nis
  • oracle-linux-upgrade-softhsm
  • oracle-linux-upgrade-softhsm-devel

References

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