ESB-2018.1075 - [Ubuntu] ubuntu-release-upgrader: Increased privileges - Remote/unauthenticated 2018-04-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1075
                   ubuntu-release-upgrader vulnerability
                               10 April 2018

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

Product:           ubuntu-release-upgrader
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Increased Privileges -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3623-1

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USN-3623-1: ubuntu-release-upgrader vulnerability

9 April 2018

ubuntu-release-upgrader vulnerability

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

  o Ubuntu 17.10
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

ubuntu-release-upgrader incorrectly opened as browser as an administrator.

Software Description

  o ubuntu-release-upgrader - manage release upgrades

Details

It was discovered that ubuntu-release-upgrader did not correctly drop
permissions before opening a browser to view the release notes. This update
fixes the issue.

Update instructions

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

Ubuntu 17.10
    python3-distupgrade - 1:17.10.11
Ubuntu 16.04 LTS
    python3-distupgrade - 1:16.04.25
Ubuntu 14.04 LTS
    python3-distupgrade - 1:0.220.10

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

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

References

  o https://usn.ubuntu.com/usn/usn-3623-1
  o https://launchpad.net/bugs/1174007

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