USN-3748-1: base-files vulnerability

21 August 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

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