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USN-4635-1: Kerberos vulnerability

17 November 2020

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



  • krb5 - MIT Kerberos Network Authentication Protocol


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
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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