ESB-2017.1817 - [Ubuntu] heimdal: Access privileged data - Remote/unauthenticated 2017-07-25

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1817
                           Heimdal vulnerability
                               25 July 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           heimdal
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-11103  

Reference:         ESB-2017.1756

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3353-3

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Ubuntu Security Notice USN-3353-3
July 24, 2017

heimdal vulnerability
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

Heimdal could allow unintended access to network services.

Software Description:
- - heimdal: Heimdal Kerberos Network Authentication Protocol

Details:

USN-3353-1 fixed a vulnerability in Heimdal. This update provides
the corresponding updade for Ubuntu 12.04 ESM.

Original advisory details:

 Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams discovered
 that Heimdal clients incorrectly trusted unauthenticated portions
 of Kerberos tickets. A remote attacker could use this to impersonate
 trusted network services or perform other attacks.

Update instructions:

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

Ubuntu 12.04 ESM:
- -  libkrb5-26-heimdal1.6~git20120311.dfsg.1-2ubuntu0.2

After a standard system update you need to restart any applications
using Heimdal libraries to make all the necessary changes.

References:
- -  https://www.ubuntu.com/usn/usn-3353-3
- -  https://www.ubuntu.com/usn/usn-3353-1
- -  CVE-2017-11103

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