=========================================================================Ubuntu Security Notice USN-4635-1
November 17, 2020

krb5 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

Summary:

Kerberos could be made to consume unlimited resources if it received specially crafted
ASN.1.

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

Demi Obenour discovered that Kerberos incorrectly handled certain ASN.1.
An attacker could possibly use this issue to cause a denial of service.

Update instructions:

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

Ubuntu 20.10:
  krb5-admin-server               1.17-10ubuntu0.1
  krb5-k5tls                      1.17-10ubuntu0.1
  krb5-kdc                        1.17-10ubuntu0.1
  krb5-kdc-ldap                   1.17-10ubuntu0.1
  krb5-kpropd                     1.17-10ubuntu0.1
  krb5-locales                    1.17-10ubuntu0.1
  krb5-multidev                   1.17-10ubuntu0.1
  krb5-otp                        1.17-10ubuntu0.1
  krb5-pkinit                     1.17-10ubuntu0.1
  krb5-user                       1.17-10ubuntu0.1
  libgssapi-krb5-2                1.17-10ubuntu0.1
  libgssrpc4                      1.17-10ubuntu0.1
  libk5crypto3                    1.17-10ubuntu0.1
  libkadm5clnt-mit11              1.17-10ubuntu0.1
  libkadm5srv-mit11               1.17-10ubuntu0.1
  libkdb5-9                       1.17-10ubuntu0.1
  libkrad0                        1.17-10ubuntu0.1
  libkrb5-3                       1.17-10ubuntu0.1
  libkrb5support0                 1.17-10ubuntu0.1

Ubuntu 20.04 LTS:
  krb5-admin-server               1.17-6ubuntu4.1
  krb5-k5tls                      1.17-6ubuntu4.1
  krb5-kdc                        1.17-6ubuntu4.1
  krb5-kdc-ldap                   1.17-6ubuntu4.1
  krb5-kpropd                     1.17-6ubuntu4.1
  krb5-locales                    1.17-6ubuntu4.1
  krb5-multidev                   1.17-6ubuntu4.1
  krb5-otp                        1.17-6ubuntu4.1
  krb5-pkinit                     1.17-6ubuntu4.1
  krb5-user                       1.17-6ubuntu4.1
  libgssapi-krb5-2                1.17-6ubuntu4.1
  libgssrpc4                      1.17-6ubuntu4.1
  libk5crypto3                    1.17-6ubuntu4.1
  libkadm5clnt-mit11              1.17-6ubuntu4.1
  libkadm5srv-mit11               1.17-6ubuntu4.1
  libkdb5-9                       1.17-6ubuntu4.1
  libkrad0                        1.17-6ubuntu4.1
  libkrb5-3                       1.17-6ubuntu4.1
  libkrb5support0                 1.17-6ubuntu4.1

Ubuntu 18.04 LTS:
  krb5-admin-server               1.16-2ubuntu0.2
  krb5-k5tls                      1.16-2ubuntu0.2
  krb5-kdc                        1.16-2ubuntu0.2
  krb5-kdc-ldap                   1.16-2ubuntu0.2
  krb5-kpropd                     1.16-2ubuntu0.2
  krb5-locales                    1.16-2ubuntu0.2
  krb5-otp                        1.16-2ubuntu0.2
  krb5-pkinit                     1.16-2ubuntu0.2
  krb5-user                       1.16-2ubuntu0.2
  libgssapi-krb5-2                1.16-2ubuntu0.2
  libgssrpc4                      1.16-2ubuntu0.2
  libk5crypto3                    1.16-2ubuntu0.2
  libkadm5clnt-mit11              1.16-2ubuntu0.2
  libkadm5srv-mit11               1.16-2ubuntu0.2
  libkdb5-9                       1.16-2ubuntu0.2
  libkrad0                        1.16-2ubuntu0.2
  libkrb5-3                       1.16-2ubuntu0.2
  libkrb5support0                 1.16-2ubuntu0.2

Ubuntu 16.04 LTS:
  krb5-admin-server               1.13.2+dfsg-5ubuntu2.2
  krb5-k5tls                      1.13.2+dfsg-5ubuntu2.2
  krb5-kdc                        1.13.2+dfsg-5ubuntu2.2
  krb5-kdc-ldap                   1.13.2+dfsg-5ubuntu2.2
  krb5-locales                    1.13.2+dfsg-5ubuntu2.2
  krb5-multidev                   1.13.2+dfsg-5ubuntu2.2
  krb5-otp                        1.13.2+dfsg-5ubuntu2.2
  krb5-pkinit                     1.13.2+dfsg-5ubuntu2.2
  krb5-user                       1.13.2+dfsg-5ubuntu2.2
  libgssapi-krb5-2                1.13.2+dfsg-5ubuntu2.2
  libgssrpc4                      1.13.2+dfsg-5ubuntu2.2
  libk5crypto3                    1.13.2+dfsg-5ubuntu2.2
  libkadm5clnt-mit9               1.13.2+dfsg-5ubuntu2.2
  libkadm5srv-mit9                1.13.2+dfsg-5ubuntu2.2
  libkdb5-8                       1.13.2+dfsg-5ubuntu2.2
  libkrad0                        1.13.2+dfsg-5ubuntu2.2
  libkrb5-3                       1.13.2+dfsg-5ubuntu2.2
  libkrb5support0                 1.13.2+dfsg-5ubuntu2.2

Ubuntu 14.04 ESM:
  krb5-admin-server               1.12+dfsg-2ubuntu5.4+esm2
  krb5-kdc                        1.12+dfsg-2ubuntu5.4+esm2
  krb5-kdc-ldap                   1.12+dfsg-2ubuntu5.4+esm2
  krb5-locales                    1.12+dfsg-2ubuntu5.4+esm2
  krb5-multidev                   1.12+dfsg-2ubuntu5.4+esm2
  krb5-otp                        1.12+dfsg-2ubuntu5.4+esm2
  krb5-pkinit                     1.12+dfsg-2ubuntu5.4+esm2
  krb5-user                       1.12+dfsg-2ubuntu5.4+esm2
  libgssapi-krb5-2                1.12+dfsg-2ubuntu5.4+esm2
  libgssrpc4                      1.12+dfsg-2ubuntu5.4+esm2
  libk5crypto3                    1.12+dfsg-2ubuntu5.4+esm2
  libkadm5clnt-mit9               1.12+dfsg-2ubuntu5.4+esm2
  libkadm5srv-mit8                1.12+dfsg-2ubuntu5.4+esm2
  libkadm5srv-mit9                1.12+dfsg-2ubuntu5.4+esm2
  libkdb5-7                       1.12+dfsg-2ubuntu5.4+esm2
  libkrad0                        1.12+dfsg-2ubuntu5.4+esm2
  libkrb5-3                       1.12+dfsg-2ubuntu5.4+esm2
  libkrb5support0                 1.12+dfsg-2ubuntu5.4+esm2

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

References:
  https://ubuntu.com/security/notices/USN-4635-1
  CVE-2020-28196

Package Information:
  https://launchpad.net/ubuntu/+source/krb5/1.17-10ubuntu0.1
  https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.1
  https://launchpad.net/ubuntu/+source/krb5/1.16-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/krb5/1.13.2+dfsg-5ubuntu2.2

Ubuntu 4635-1: Kerberos vulnerability

November 17, 2020
Kerberos could be made to consume unlimited resources if it received specially crafted ASN.1.

Summary

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: krb5-admin-server 1.17-10ubuntu0.1 krb5-k5tls 1.17-10ubuntu0.1 krb5-kdc 1.17-10ubuntu0.1 krb5-kdc-ldap 1.17-10ubuntu0.1 krb5-kpropd 1.17-10ubuntu0.1 krb5-locales 1.17-10ubuntu0.1 krb5-multidev 1.17-10ubuntu0.1 krb5-otp 1.17-10ubuntu0.1 krb5-pkinit 1.17-10ubuntu0.1 krb5-user 1.17-10ubuntu0.1 libgssapi-krb5-2 1.17-10ubuntu0.1 libgssrpc4 1.17-10ubuntu0.1 libk5crypto3 1.17-10ubuntu0.1 libkadm5clnt-mit11 1.17-10ubuntu0.1 libkadm5srv-mit11 1.17-10ubuntu0.1 libkdb5-9 1.17-10ubuntu0.1 libkrad0 1.17-10ubuntu0.1 libkrb5-3 1.17-10ubuntu0.1 libkrb5support0 1.17-10ubuntu0.1 Ubuntu 20.04 LTS: krb5-admin-server 1.17-6ubuntu4.1 krb5-k5tls 1.17-6ubuntu4.1 krb5-kdc 1.17-6ubuntu4.1 krb5-kdc-ldap 1.17-6ubuntu4.1 krb5-kpropd 1.17-6ubuntu4.1 krb5-locales 1.17-6ubuntu4.1 krb5-multidev 1.17-6ubuntu4.1 krb5-otp 1.17-6ubuntu4.1 krb5-pkinit 1.17-6ubuntu4.1 krb5-user 1.17-6ubuntu4.1 libgssapi-krb5-2 1.17-6ubuntu4.1 libgssrpc4 1.17-6ubuntu4.1 libk5crypto3 1.17-6ubuntu4.1 libkadm5clnt-mit11 1.17-6ubuntu4.1 libkadm5srv-mit11 1.17-6ubuntu4.1 libkdb5-9 1.17-6ubuntu4.1 libkrad0 1.17-6ubuntu4.1 libkrb5-3 1.17-6ubuntu4.1 libkrb5support0 1.17-6ubuntu4.1 Ubuntu 18.04 LTS: krb5-admin-server 1.16-2ubuntu0.2 krb5-k5tls 1.16-2ubuntu0.2 krb5-kdc 1.16-2ubuntu0.2 krb5-kdc-ldap 1.16-2ubuntu0.2 krb5-kpropd 1.16-2ubuntu0.2 krb5-locales 1.16-2ubuntu0.2 krb5-otp 1.16-2ubuntu0.2 krb5-pkinit 1.16-2ubuntu0.2 krb5-user 1.16-2ubuntu0.2 libgssapi-krb5-2 1.16-2ubuntu0.2 libgssrpc4 1.16-2ubuntu0.2 libk5crypto3 1.16-2ubuntu0.2 libkadm5clnt-mit11 1.16-2ubuntu0.2 libkadm5srv-mit11 1.16-2ubuntu0.2 libkdb5-9 1.16-2ubuntu0.2 libkrad0 1.16-2ubuntu0.2 libkrb5-3 1.16-2ubuntu0.2 libkrb5support0 1.16-2ubuntu0.2 Ubuntu 16.04 LTS: krb5-admin-server 1.13.2+dfsg-5ubuntu2.2 krb5-k5tls 1.13.2+dfsg-5ubuntu2.2 krb5-kdc 1.13.2+dfsg-5ubuntu2.2 krb5-kdc-ldap 1.13.2+dfsg-5ubuntu2.2 krb5-locales 1.13.2+dfsg-5ubuntu2.2 krb5-multidev 1.13.2+dfsg-5ubuntu2.2 krb5-otp 1.13.2+dfsg-5ubuntu2.2 krb5-pkinit 1.13.2+dfsg-5ubuntu2.2 krb5-user 1.13.2+dfsg-5ubuntu2.2 libgssapi-krb5-2 1.13.2+dfsg-5ubuntu2.2 libgssrpc4 1.13.2+dfsg-5ubuntu2.2 libk5crypto3 1.13.2+dfsg-5ubuntu2.2 libkadm5clnt-mit9 1.13.2+dfsg-5ubuntu2.2 libkadm5srv-mit9 1.13.2+dfsg-5ubuntu2.2 libkdb5-8 1.13.2+dfsg-5ubuntu2.2 libkrad0 1.13.2+dfsg-5ubuntu2.2 libkrb5-3 1.13.2+dfsg-5ubuntu2.2 libkrb5support0 1.13.2+dfsg-5ubuntu2.2 Ubuntu 14.04 ESM: krb5-admin-server 1.12+dfsg-2ubuntu5.4+esm2 krb5-kdc 1.12+dfsg-2ubuntu5.4+esm2 krb5-kdc-ldap 1.12+dfsg-2ubuntu5.4+esm2 krb5-locales 1.12+dfsg-2ubuntu5.4+esm2 krb5-multidev 1.12+dfsg-2ubuntu5.4+esm2 krb5-otp 1.12+dfsg-2ubuntu5.4+esm2 krb5-pkinit 1.12+dfsg-2ubuntu5.4+esm2 krb5-user 1.12+dfsg-2ubuntu5.4+esm2 libgssapi-krb5-2 1.12+dfsg-2ubuntu5.4+esm2 libgssrpc4 1.12+dfsg-2ubuntu5.4+esm2 libk5crypto3 1.12+dfsg-2ubuntu5.4+esm2 libkadm5clnt-mit9 1.12+dfsg-2ubuntu5.4+esm2 libkadm5srv-mit8 1.12+dfsg-2ubuntu5.4+esm2 libkadm5srv-mit9 1.12+dfsg-2ubuntu5.4+esm2 libkdb5-7 1.12+dfsg-2ubuntu5.4+esm2 libkrad0 1.12+dfsg-2ubuntu5.4+esm2 libkrb5-3 1.12+dfsg-2ubuntu5.4+esm2 libkrb5support0 1.12+dfsg-2ubuntu5.4+esm2 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4635-1

CVE-2020-28196

Severity
November 17, 2020

Package Information

https://launchpad.net/ubuntu/+source/krb5/1.17-10ubuntu0.1 https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.1 https://launchpad.net/ubuntu/+source/krb5/1.16-2ubuntu0.2 https://launchpad.net/ubuntu/+source/krb5/1.13.2+dfsg-5ubuntu2.2

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