==========================================================================

Ubuntu Security Notice USN-6947-1
August 08, 2024

krb5 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Kerberos could be made to crash if it received specially crafted
input.

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

It was discovered that Kerberos incorrectly handled GSS message tokens
where an unwrapped token could appear to be truncated. An attacker
could possibly use this issue to cause a denial of service.
(CVE-2024-37370)

It was discovered that Kerberos incorrectly handled GSS message tokens
when sent a token with invalid length fields. An attacker could possibly
use this issue to cause a denial of service. (CVE-2024-37371)

Update instructions:

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

Ubuntu 24.04 LTS
   krb5-admin-server               1.20.1-6ubuntu2.1
   krb5-kdc                        1.20.1-6ubuntu2.1
   krb5-kdc-ldap                   1.20.1-6ubuntu2.1
   krb5-otp                        1.20.1-6ubuntu2.1
   krb5-pkinit                     1.20.1-6ubuntu2.1
   krb5-user                       1.20.1-6ubuntu2.1
   libgssapi-krb5-2                1.20.1-6ubuntu2.1
   libgssrpc4t64                   1.20.1-6ubuntu2.1
   libk5crypto3                    1.20.1-6ubuntu2.1
   libkadm5clnt-mit12              1.20.1-6ubuntu2.1
   libkadm5srv-mit12               1.20.1-6ubuntu2.1
   libkdb5-10t64                   1.20.1-6ubuntu2.1
   libkrad0                        1.20.1-6ubuntu2.1
   libkrb5-3                       1.20.1-6ubuntu2.1
   libkrb5support0                 1.20.1-6ubuntu2.1

Ubuntu 22.04 LTS
   krb5-admin-server               1.19.2-2ubuntu0.4
   krb5-kdc                        1.19.2-2ubuntu0.4
   krb5-kdc-ldap                   1.19.2-2ubuntu0.4
   krb5-otp                        1.19.2-2ubuntu0.4
   krb5-pkinit                     1.19.2-2ubuntu0.4
   krb5-user                       1.19.2-2ubuntu0.4
   libgssapi-krb5-2                1.19.2-2ubuntu0.4
   libgssrpc4                      1.19.2-2ubuntu0.4
   libk5crypto3                    1.19.2-2ubuntu0.4
   libkadm5clnt-mit12              1.19.2-2ubuntu0.4
   libkadm5srv-mit12               1.19.2-2ubuntu0.4
   libkdb5-10                      1.19.2-2ubuntu0.4
   libkrad0                        1.19.2-2ubuntu0.4
   libkrb5-3                       1.19.2-2ubuntu0.4
   libkrb5support0                 1.19.2-2ubuntu0.4

Ubuntu 20.04 LTS
   krb5-admin-server               1.17-6ubuntu4.6
   krb5-kdc                        1.17-6ubuntu4.6
   krb5-kdc-ldap                   1.17-6ubuntu4.6
   krb5-otp                        1.17-6ubuntu4.6
   krb5-pkinit                     1.17-6ubuntu4.6
   krb5-user                       1.17-6ubuntu4.6
   libgssapi-krb5-2                1.17-6ubuntu4.6
   libgssrpc4                      1.17-6ubuntu4.6
   libk5crypto3                    1.17-6ubuntu4.6
   libkadm5clnt-mit11              1.17-6ubuntu4.6
   libkadm5srv-mit11               1.17-6ubuntu4.6
   libkdb5-9                       1.17-6ubuntu4.6
   libkrad0                        1.17-6ubuntu4.6
   libkrb5-3                       1.17-6ubuntu4.6
   libkrb5support0                 1.17-6ubuntu4.6

Ubuntu 18.04 LTS
   krb5-admin-server               1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   krb5-kdc                        1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   krb5-kdc-ldap                   1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   krb5-otp                        1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   krb5-pkinit                     1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   krb5-user                       1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libgssapi-krb5-2                1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libgssrpc4                      1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libk5crypto3                    1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkadm5clnt-mit11              1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkadm5srv-mit11               1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkdb5-9                       1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkrad0                        1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkrb5-3                       1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro
   libkrb5support0                 1.16-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   krb5-admin-server               1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   krb5-kdc                        1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   krb5-kdc-ldap                   1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   krb5-otp                        1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   krb5-pkinit                     1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   krb5-user                       1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libgssapi-krb5-2                1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libgssrpc4                      1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libk5crypto3                    1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkadm5clnt-mit9               1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkadm5srv-mit9                1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkdb5-8                       1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkrad0                        1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkrb5-3                       1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro
   libkrb5support0                 1.13.2+dfsg-5ubuntu2.2+esm5
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   krb5-admin-server               1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   krb5-kdc                        1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   krb5-kdc-ldap                   1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   krb5-otp                        1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   krb5-pkinit                     1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   krb5-user                       1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libgssapi-krb5-2                1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libgssrpc4                      1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libk5crypto3                    1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkadm5clnt-mit9               1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkadm5srv-mit8                1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkadm5srv-mit9                1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkdb5-7                       1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkrad0                        1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkrb5-3                       1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro
   libkrb5support0                 1.12+dfsg-2ubuntu5.4+esm5
                                   Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6947-1 
<https://ubuntu.com/security/notices/USN-6947-1>
   CVE-2024-37370, CVE-2024-37371

Package Information:
https://launchpad.net/ubuntu/+source/krb5/1.20.1-6ubuntu2.1 
<https://launchpad.net/ubuntu/+source/krb5/1.20.1-6ubuntu2.1>
https://launchpad.net/ubuntu/+source/krb5/1.19.2-2ubuntu0.4 
<https://launchpad.net/ubuntu/+source/krb5/1.19.2-2ubuntu0.4>
https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.6 
<https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.6>