==========================================================================
Ubuntu Security Notice USN-5673-1
October 13, 2022

unzip vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in unzip.

Software Description:
- unzip: De-archiver for .zip files

Details:

It was discovered that unzip did not properly handle unicode strings under
certain circumstances. If a user were tricked into opening a specially crafted
zip file, an attacker could possibly use this issue to cause unzip to crash,
resulting in a denial of service, or possibly execute arbitrary code. 
(CVE-2021-4217)

It was discovered that unzip did not properly perform bounds checking while
converting wide strings to local strings. If a user were tricked into opening a
specially crafted zip file, an attacker could possibly use this issue to cause
unzip to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2022-0529, CVE-2022-0530)

Update instructions:

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

Ubuntu 22.04 LTS:
  unzip                           6.0-26ubuntu3.1

Ubuntu 20.04 LTS:
  unzip                           6.0-25ubuntu1.1

Ubuntu 18.04 LTS:
  unzip                           6.0-21ubuntu1.2

Ubuntu 16.04 ESM:
  unzip                           6.0-20ubuntu1.1+esm1

Ubuntu 14.04 ESM:
  unzip                           6.0-9ubuntu1.6+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5673-1
  CVE-2021-4217, CVE-2022-0529, CVE-2022-0530, https://launchpad.net/bugs/1957077

Package Information:
  https://launchpad.net/ubuntu/+source/unzip/6.0-26ubuntu3.1
  https://launchpad.net/ubuntu/+source/unzip/6.0-25ubuntu1.1
  https://launchpad.net/ubuntu/+source/unzip/6.0-21ubuntu1.2