ESB-2018.2471 - [Ubuntu] base-files: Multiple vulnerabilities 2018-08-22

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2471
                         base-files vulnerability
                              22 August 2018

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

Product:           base-files
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6557  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3748-1

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Ubuntu Security Notice USN-3748-1
August 21, 2018

base-files vulnerability
==========================================================================

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

- - Ubuntu 18.04 LTS

Summary:

base-files could be made to hang or overwrite files as the administrator.

Software Description:
- - base-files: Debian base system miscellaneous files

Details:

Sander Bos discovered that the MOTD update script incorrectly handled
temporary files. A local attacker could use this issue to cause a denial of
service, or possibly escalate privileges if kernel symlink restrictions
were disabled.

Update instructions:

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

Ubuntu 18.04 LTS:
  base-files                      10.1ubuntu2.2

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

References:
  https://usn.ubuntu.com/usn/usn-3748-1
  CVE-2018-6557

Package Information:
  https://launchpad.net/ubuntu/+source/base-files/10.1ubuntu2.2

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