USN-4092-1: Ghostscript vulnerability

12 August 2019

ghostscript vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary

Ghostscript could be made to access files if it opened a specially crafted file.

Software Description

  • ghostscript - PostScript and PDF interpreter

Details

Netanel Fisher discovered that the font handler in Ghostscript did not properly restrict privileged calls when ‘-dSAFER’ restrictions were in effect. If a user or automated system were tricked into processing a specially crafted file, a remote attacker could possibly use this issue to access arbitrary files.

Update instructions

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

Ubuntu 19.04
ghostscript - 9.26~dfsg+0-0ubuntu7.2
libgs9 - 9.26~dfsg+0-0ubuntu7.2
Ubuntu 18.04 LTS
ghostscript - 9.26~dfsg+0-0ubuntu0.18.04.10
libgs9 - 9.26~dfsg+0-0ubuntu0.18.04.10
Ubuntu 16.04 LTS
ghostscript - 9.26~dfsg+0-0ubuntu0.16.04.10
libgs9 - 9.26~dfsg+0-0ubuntu0.16.04.10

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