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USN-6467-2: Kerberos vulnerability

6 November 2023

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

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Releases

Packages

  • krb5 - MIT Kerberos Network Authentication Protocol

Details

USN-6467-1 fixed a vulnerability in Kerberos. This update provides the
corresponding update for Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu
23.04.

Original advisory details:

Robert Morris discovered that Kerberos did not properly handle memory
access when processing RPC data through kadmind, which could lead to the
freeing of uninitialized memory. An authenticated remote attacker could
possibly use this issue to cause kadmind to crash, resulting in a denial
of service.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 23.04
Ubuntu 22.04
Ubuntu 20.04

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

References

Related notices

  • USN-6467-1: libkrad-dev, libkdb5-9, libkadm5srv-mit11, krb5, krb5-kdc-ldap, krb5-pkinit, libkrb5-dev, libkrad0, libkadm5clnt-mit9, krb5-locales, libkrb5support0, libgssapi-krb5-2, krb5-gss-samples, libkadm5clnt-mit11, krb5-user, libkdb5-7, krb5-doc, libkadm5srv-mit8, libkrb5-3, krb5-admin-server, libgssrpc4, krb5-kdc, krb5-k5tls, krb5-otp, libk5crypto3, krb5-kpropd, libkadm5srv-mit9, libkdb5-8, krb5-multidev