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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)

Reduce your security exposure

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.

Learn more about Ubuntu Pro

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.

Related notices

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