Operating System:

[Ubuntu]

Published:

17 January 2019

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0150
                          PolicyKit vulnerability
                              17 January 2019

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

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

Product:           libpolkit-backend-1-0
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19788  

Reference:         ESB-2019.0059
                   ESB-2019.0050
                   ESB-2018.3797

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3861-1
   http://www.ubuntu.com/usn/usn-3861-2

Comment: This bulletin contains two (2) security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-3861-1: PolicyKit vulnerability

16 January 2019

policykit-1 vulnerability

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

  o Ubuntu 18.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

PolicyKit could allow unintended access.

Software Description

  o policykit-1 - framework for managing administrative policies and privileges

Details

It was discovered that PolicyKit incorrectly handled certain large user UIDs. A
local attacker with a large UID could possibly use this issue to perform
privileged actions.

Update instructions

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

Ubuntu 18.10
    libpolkit-backend-1-0 - 0.105-21ubuntu0.3
    policykit-1 - 0.105-21ubuntu0.3
Ubuntu 18.04 LTS
    libpolkit-backend-1-0 - 0.105-20ubuntu0.18.04.4
    policykit-1 - 0.105-20ubuntu0.18.04.4
Ubuntu 16.04 LTS
    libpolkit-backend-1-0 - 0.105-14.1ubuntu0.4
    policykit-1 - 0.105-14.1ubuntu0.4
Ubuntu 14.04 LTS
    libpolkit-backend-1-0 - 0.105-4ubuntu3.14.04.5
    policykit-1 - 0.105-4ubuntu3.14.04.5

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o CVE-2018-19788

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

- -------------------------------------------------------------------------------

USN-3861-2: PolicyKit vulnerability

16 January 2019

policykit-1 vulnerability

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

  o Ubuntu 12.04 ESM

Summary

PolicyKit could allow unintended access.

Software Description

  o policykit-1 - framework for managing administrative policies and privileges

Details

USN-3861-1 fixed a vulnerability in PolicyKit. This update provides the
corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that PolicyKit incorrectly handled certain large user UIDs. A
local attacker with a large UID could possibly use this issue to perform
privileged actions.

Update instructions

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

Ubuntu 12.04 ESM
    libpolkit-backend-1-0 - 0.104-1ubuntu1.4
    policykit-1 - 0.104-1ubuntu1.4

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o USN-3861-1
  o CVE-2018-19788

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

- --------------------------END INCLUDED TEXT--------------------

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