USN-5828-1: Kerberos vulnerabilities

Releases

• Ubuntu 22.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

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)

Update instructions

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

Ubuntu 22.10

• krb5-user - 1.20-1ubuntu0.1
• libkdb5-10 - 1.20-1ubuntu0.1
• libgssapi-krb5-2 - 1.20-1ubuntu0.1
• krb5-kdc - 1.20-1ubuntu0.1
• krb5-admin-server - 1.20-1ubuntu0.1

Ubuntu 22.04

• krb5-user - 1.19.2-2ubuntu0.1
• libkdb5-10 - 1.19.2-2ubuntu0.1
• libgssapi-krb5-2 - 1.19.2-2ubuntu0.1
• krb5-kdc - 1.19.2-2ubuntu0.1
• krb5-admin-server - 1.19.2-2ubuntu0.1

Ubuntu 20.04

• libkdb5-9 - 1.17-6ubuntu4.2
• krb5-user - 1.17-6ubuntu4.2
• libgssapi-krb5-2 - 1.17-6ubuntu4.2
• krb5-kdc - 1.17-6ubuntu4.2
• krb5-admin-server - 1.17-6ubuntu4.2

Ubuntu 18.04

• libkdb5-9 - 1.16-2ubuntu0.3
• krb5-user - 1.16-2ubuntu0.3
• libgssapi-krb5-2 - 1.16-2ubuntu0.3
• krb5-kdc - 1.16-2ubuntu0.3
• krb5-admin-server - 1.16-2ubuntu0.3

Ubuntu 16.04

• krb5-user - 1.13.2+dfsg-5ubuntu2.2+esm3
  Available with Ubuntu Pro
• libgssapi-krb5-2 - 1.13.2+dfsg-5ubuntu2.2+esm3
  Available with Ubuntu Pro
• krb5-kdc - 1.13.2+dfsg-5ubuntu2.2+esm3
  Available with Ubuntu Pro
• libkdb5-8 - 1.13.2+dfsg-5ubuntu2.2+esm3
  Available with Ubuntu Pro
• krb5-admin-server - 1.13.2+dfsg-5ubuntu2.2+esm3
  Available with Ubuntu Pro

Ubuntu 14.04

• krb5-user - 1.12+dfsg-2ubuntu5.4+esm3
  Available with Ubuntu Pro
• libgssapi-krb5-2 - 1.12+dfsg-2ubuntu5.4+esm3
  Available with Ubuntu Pro
• krb5-kdc - 1.12+dfsg-2ubuntu5.4+esm3
  Available with Ubuntu Pro
• libkdb5-7 - 1.12+dfsg-2ubuntu5.4+esm3
  Available with Ubuntu Pro
• krb5-admin-server - 1.12+dfsg-2ubuntu5.4+esm3
  Available with Ubuntu Pro

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

References

• CVE-2022-42898
• CVE-2018-20217

Related notices

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