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USN-5828-1: Kerberos vulnerabilities

25 January 2023

Several security issues were fixed in Kerberos.

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Releases

Packages

  • krb5 - MIT Kerberos Network Authentication Protocol

Details

It was discovered that Kerberos incorrectly handled certain S4U2Self
requests. An attacker could possibly use this issue to cause a denial of
service. This issue was only addressed in Ubuntu 16.04 ESM and Ubuntu
18.04 LTS. (CVE-2018-20217)

Greg Hudson discovered that Kerberos PAC implementation incorrectly
handled certain parsing operations. A remote attacker could use this
issue to cause a denial of service, or possibly execute arbitrary code.
(CVE-2022-42898)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to restart any application
using Kerberos libraries to make all the necessary changes.

References

Related notices

  • USN-5800-1: heimdal, libheimbase1-heimdal, libhcrypto4-heimdal, heimdal-multidev, heimdal-kdc, libkrb5-26-heimdal, libkadm5clnt7-heimdal, libroken18-heimdal, libhdb9-heimdal, libkdc2-heimdal, heimdal-kcm, heimdal-servers, libsl0-heimdal, heimdal-dev, heimdal-clients, heimdal-servers-x, libgssapi3-heimdal, heimdal-clients-x, libkafs0-heimdal, libotp0-heimdal, libasn1-8-heimdal, libkadm5srv8-heimdal, heimdal-docs, libwind0-heimdal, libheimntlm0-heimdal, libhx509-5-heimdal
  • USN-5822-1: samba-libs, samba-common, samba, python3-ldb-dev, libsmbclient-dev, smbclient, libldb2, python3-samba, libpam-winbind, winbind, ctdb, libnss-winbind, samba-common-bin, samba-dev, libldb-dev, samba-vfs-modules, registry-tools, samba-testsuite, libwbclient0, ldb-tools, python3-ldb, libsmbclient, libwbclient-dev, samba-dsdb-modules
  • USN-5936-1: samba-libs, samba-common, samba, libsmbclient-dev, smbclient, python3-samba, libpam-winbind, winbind, ctdb, libnss-winbind, samba-common-bin, samba-dev, samba-vfs-modules, registry-tools, samba-testsuite, libwbclient0, libsmbclient, libwbclient-dev, samba-dsdb-modules

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Further reading