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AUSCERT External Security Bulletin Redistribution
ESB-2023.0465
USN-5828-1: Kerberos vulnerabilities
27 January 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Kerberos
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2022-42898 CVE-2018-20217
Original Bulletin:
https://ubuntu.com/security/notices/USN-5828-1
Comment: CVSS (Max): 8.8 CVE-2022-42898 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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USN-5828-1: Kerberos vulnerabilities
25 January 2023
Several security issues were fixed in Kerberos.
Releases
o Ubuntu 22.10
o Ubuntu 22.04 LTS
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o 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
o krb5-user - 1.20-1ubuntu0.1
o libkdb5-10 - 1.20-1ubuntu0.1
o libgssapi-krb5-2 - 1.20-1ubuntu0.1
o krb5-kdc - 1.20-1ubuntu0.1
o krb5-admin-server - 1.20-1ubuntu0.1
Ubuntu 22.04
o krb5-user - 1.19.2-2ubuntu0.1
o libkdb5-10 - 1.19.2-2ubuntu0.1
o libgssapi-krb5-2 - 1.19.2-2ubuntu0.1
o krb5-kdc - 1.19.2-2ubuntu0.1
o krb5-admin-server - 1.19.2-2ubuntu0.1
Ubuntu 20.04
o libkdb5-9 - 1.17-6ubuntu4.2
o krb5-user - 1.17-6ubuntu4.2
o libgssapi-krb5-2 - 1.17-6ubuntu4.2
o krb5-kdc - 1.17-6ubuntu4.2
o krb5-admin-server - 1.17-6ubuntu4.2
Ubuntu 18.04
o libkdb5-9 - 1.16-2ubuntu0.3
o krb5-user - 1.16-2ubuntu0.3
o libgssapi-krb5-2 - 1.16-2ubuntu0.3
o krb5-kdc - 1.16-2ubuntu0.3
o krb5-admin-server - 1.16-2ubuntu0.3
Ubuntu 16.04
o krb5-user - 1.13.2+dfsg-5ubuntu2.2+esm3
Available with Ubuntu Pro (Infra-only)
o libgssapi-krb5-2 - 1.13.2+dfsg-5ubuntu2.2+esm3
Available with Ubuntu Pro (Infra-only)
o krb5-kdc - 1.13.2+dfsg-5ubuntu2.2+esm3
Available with Ubuntu Pro (Infra-only)
o libkdb5-8 - 1.13.2+dfsg-5ubuntu2.2+esm3
Available with Ubuntu Pro (Infra-only)
o krb5-admin-server - 1.13.2+dfsg-5ubuntu2.2+esm3
Available with Ubuntu Pro (Infra-only)
Ubuntu 14.04
o krb5-user - 1.12+dfsg-2ubuntu5.4+esm3
Available with Ubuntu Pro (Infra-only)
o libgssapi-krb5-2 - 1.12+dfsg-2ubuntu5.4+esm3
Available with Ubuntu Pro (Infra-only)
o krb5-kdc - 1.12+dfsg-2ubuntu5.4+esm3
Available with Ubuntu Pro (Infra-only)
o libkdb5-7 - 1.12+dfsg-2ubuntu5.4+esm3
Available with Ubuntu Pro (Infra-only)
o krb5-admin-server - 1.12+dfsg-2ubuntu5.4+esm3
Available with Ubuntu Pro (Infra-only)
After a standard system update you need to restart any application
using Kerberos libraries to make all the necessary changes.
References
o CVE-2022-42898
o CVE-2018-20217
Related notices
o USN-5800-1 : libheimntlm0-heimdal, libkafs0-heimdal, libkadm5clnt7-heimdal,
heimdal-docs, heimdal-kcm, libheimbase1-heimdal, heimdal-dev, heimdal,
libhx509-5-heimdal, heimdal-servers-x, libsl0-heimdal, heimdal-multidev,
heimdal-clients-x, libotp0-heimdal, libasn1-8-heimdal, heimdal-servers,
libwind0-heimdal, libhdb9-heimdal, libgssapi3-heimdal, heimdal-clients,
heimdal-kdc, libkrb5-26-heimdal, libroken18-heimdal, libkadm5srv8-heimdal,
libhcrypto4-heimdal, libkdc2-heimdal
o USN-5822-1 : ldb-tools, registry-tools, samba-libs, python3-ldb, libldb2,
samba-common-bin, libsmbclient-dev, winbind, samba-vfs-modules,
samba-testsuite, libnss-winbind, libwbclient-dev, smbclient, samba,
libsmbclient, python3-ldb-dev, ctdb, libwbclient0, libldb-dev,
python3-samba, samba-dev, samba-dsdb-modules, samba-common, libpam-winbind
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