USN-3546-1: gcab vulnerability

24 January 2018

gcab vulnerability

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

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS


gcab could be made to crash or run programs if it opened a specially crafted file.

Software Description

  • gcab - Microsoft Cabinet file manipulation tool


Richard Hughes discovered that gcab incorrectly handled certain malformed cabinet files. If a user or automated system were tricked into opening a specially crafted cabinet file, a remote attacker could use this issue to cause gcab to crash, resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 17.10
gcab - 0.7-4ubuntu0.1
libgcab-1.0-0 - 0.7-4ubuntu0.1
Ubuntu 16.04 LTS
gcab - 0.7-1ubuntu0.1
libgcab-1.0-0 - 0.7-1ubuntu0.1

To update your system, please follow these instructions:

After a standard system update you need to restart your session to make all the necessary changes.