Ubuntu Security Notice USN-5378-3
April 13, 2022

xz-utils vulnerability

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM


XZ Utils could be made to overwrite arbitrary files.

Software Description:
- xz-utils: XZ-format compression utilities


USN-5378-2 fixed a vulnerability in XZ Utils. This update provides
the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

 Cleemy Desu Wayo discovered that Gzip incorrectly handled certain
 filenames. If a user or automated system were tricked into performing zgrep
 operations with specially crafted filenames, a remote attacker could
 overwrite arbitrary files.

Update instructions:

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

Ubuntu 16.04 ESM:
  xz-utils                        5.1.1alpha+20120614-2ubuntu2.16.04.1+esm1

Ubuntu 14.04 ESM:
  xz-utils                        5.1.1alpha+20120614-2ubuntu2.14.04.1+esm1

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