USN-4176-1: GNU cpio vulnerability

6 November 2019

cpio vulnerability

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

  • Ubuntu 19.10
  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


GNU cpio could be used to privilege escalation if it received a specially crafted input.

Software Description

  • cpio - a tool to manage archives of files


Thomas Habets discovered that GNU cpio incorrectly handled certain inputs. An attacker could possibly use this issue to privilege escalation.

Update instructions

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

Ubuntu 19.10
cpio - 2.12+dfsg-9ubuntu0.1
Ubuntu 19.04
cpio - 2.12+dfsg-6ubuntu0.19.04.1
Ubuntu 18.04 LTS
cpio - 2.12+dfsg-6ubuntu0.18.04.1
Ubuntu 16.04 LTS
cpio - 2.11+dfsg-5ubuntu1.1
Ubuntu 14.04 ESM
cpio - 2.11+dfsg-1ubuntu1.2+esm1
Ubuntu 12.04 ESM
cpio - 2.11-7ubuntu3.3

To update your system, please follow these instructions:

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