Ubuntu Security Notice USN-5828-1
January 25, 2023
krb5 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 22.10
– Ubuntu 22.04 LTS
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS
– Ubuntu 16.04 ESM
– Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in Kerberos.
Software Description:
– 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-admin-server 1.20-1ubuntu0.1
krb5-kdc 1.20-1ubuntu0.1
krb5-user 1.20-1ubuntu0.1
libgssapi-krb5-2 1.20-1ubuntu0.1
libkdb5-10 1.20-1ubuntu0.1
Ubuntu 22.04 LTS:
krb5-admin-server 1.19.2-2ubuntu0.1
krb5-kdc 1.19.2-2ubuntu0.1
krb5-user 1.19.2-2ubuntu0.1
libgssapi-krb5-2 1.19.2-2ubuntu0.1
libkdb5-10 1.19.2-2ubuntu0.1
Ubuntu 20.04 LTS:
krb5-admin-server 1.17-6ubuntu4.2
krb5-kdc 1.17-6ubuntu4.2
krb5-user 1.17-6ubuntu4.2
libgssapi-krb5-2 1.17-6ubuntu4.2
libkdb5-9 1.17-6ubuntu4.2
Ubuntu 18.04 LTS:
krb5-admin-server 1.16-2ubuntu0.3
krb5-kdc 1.16-2ubuntu0.3
krb5-user 1.16-2ubuntu0.3
libgssapi-krb5-2 1.16-2ubuntu0.3
libkdb5-9 1.16-2ubuntu0.3
Ubuntu 16.04 ESM:
krb5-admin-server 1.13.2+dfsg-5ubuntu2.2+esm3
krb5-kdc 1.13.2+dfsg-5ubuntu2.2+esm3
krb5-user 1.13.2+dfsg-5ubuntu2.2+esm3
libgssapi-krb5-2 1.13.2+dfsg-5ubuntu2.2+esm3
libkdb5-8 1.13.2+dfsg-5ubuntu2.2+esm3
Ubuntu 14.04 ESM:
krb5-admin-server 1.12+dfsg-2ubuntu5.4+esm3
krb5-kdc 1.12+dfsg-2ubuntu5.4+esm3
krb5-user 1.12+dfsg-2ubuntu5.4+esm3
libgssapi-krb5-2 1.12+dfsg-2ubuntu5.4+esm3
libkdb5-7 1.12+dfsg-2ubuntu5.4+esm3
After a standard system update you need to restart any application
using Kerberos libraries to make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5828-1
CVE-2018-20217, CVE-2022-42898
Package Information:
https://launchpad.net/ubuntu/+source/krb5/1.20-1ubuntu0.1
https://launchpad.net/ubuntu/+source/krb5/1.19.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.2
https://launchpad.net/ubuntu/+source/krb5/1.16-2ubuntu0.3
