ESB-2019.1135 - [Ubuntu] PolicyKit: Unauthorised access - Existing account 2019-04-04

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1135
                    USN-3934-1: PolicyKit vulnerability
                               4 April 2019

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

Product:           PolicyKit
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6133  

Reference:         ESB-2019.0856
                   ESB-2019.0791.2
                   ESB-2019.0716
                   ESB-2019.0691
                   ESB-2019.0670

Original Bulletin: 
   https://usn.ubuntu.com/3934-1/

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USN-3934-1: PolicyKit vulnerability
3 April 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 relied on the fork() system call
in the Linux kernel being atomic. A local attacker could possibly use this
issue to gain access to services that have cached authorizations.

Update instructions

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

Ubuntu 18.10
    libpolkit-backend-1-0 - 0.105-21ubuntu0.4
    policykit-1 - 0.105-21ubuntu0.4
Ubuntu 18.04 LTS
    libpolkit-backend-1-0 - 0.105-20ubuntu0.18.04.5
    policykit-1 - 0.105-20ubuntu0.18.04.5
Ubuntu 16.04 LTS
    libpolkit-backend-1-0 - 0.105-14.1ubuntu0.5
    policykit-1 - 0.105-14.1ubuntu0.5
Ubuntu 14.04 LTS
    libpolkit-backend-1-0 - 0.105-4ubuntu3.14.04.6
    policykit-1 - 0.105-4ubuntu3.14.04.6

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-2019-6133

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