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Ubuntu Security Notice USN-5446-2
May 30, 2022

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

- Ubuntu 16.04 ESM

Summary:

A malicious source package could write files outside the unpack directory.

Software Description:
- dpkg: Debian package management system

Details:

USN-5446-1 fixed a vulnerability in dpkg. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

 Max Justicz discovered that dpkg incorrectly handled unpacking certain
 source packages. If a user or an automated system were tricked into
 unpacking a specially crafted source package, a remote attacker could
 modify files outside the target unpack directory, leading to a denial of
 service or potentially gaining access to the system.

Update instructions:

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

Ubuntu 16.04 ESM:
  dpkg                            1.18.4ubuntu1.7+esm1
  libdpkg-perl                    1.18.4ubuntu1.7+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5446-2
  https://ubuntu.com/security/notices/USN-5446-1
  CVE-2022-1664