==========================================================================
Ubuntu Security Notice USN-5147-1
November 15, 2021

vim vulnerabilities
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Vim.

Software Description:
- vim: Vi IMproved - enhanced vi editor

Details:

It was discovered that Vim incorrectly handled permissions on the .swp
file. A local attacker could possibly use this issue to obtain sensitive
information. This issue only affected Ubuntu 14.04 ESM. (CVE-2017-17087)

It was discovered that Vim incorrectly handled restricted mode. A local
attacker could possibly use this issue to bypass restricted mode and
execute arbitrary commands. Note: This update only makes executing shell
commands more difficult. Restricted mode should not be considered a
complete security measure. This issue only affected Ubuntu 14.04 ESM.
(CVE-2019-20807)

Brian Carpenter discovered that vim incorrectly handled memory
when opening certain files. If a user was tricked into opening
a specially crafted file, a remote attacker could crash the
application, leading to a denial of service, or possible execute
arbitrary code with user privileges. This issue only affected
Ubuntu 20.04 LTS, Ubuntu 21.04 and Ubuntu 21.10. (CVE-2021-3872)

It was discovered that vim incorrectly handled memory when
opening certain files. If a user was tricked into opening
a specially crafted file, a remote attacker could crash the
application, leading to a denial of service, or possible execute
arbitrary code with user privileges. (CVE-2021-3903)

It was discovered that vim incorrectly handled memory when
opening certain files. If a user was tricked into opening
a specially crafted file, a remote attacker could crash the
application, leading to a denial of service, or possible execute
arbitrary code with user privileges. (CVE-2021-3927)

It was discovered that vim incorrectly handled memory when
opening certain files. If a user was tricked into opening
a specially crafted file, a remote attacker could crash the
application, leading to a denial of service, or possible execute
arbitrary code with user privileges. (CVE-2021-3928)

Update instructions:

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

Ubuntu 21.10:
  vim                             2:8.2.2434-3ubuntu3.1

Ubuntu 21.04:
  vim                             2:8.2.2434-1ubuntu1.2

Ubuntu 20.04 LTS:
  vim                             2:8.1.2269-1ubuntu5.4

Ubuntu 18.04 LTS:
  vim                             2:8.0.1453-1ubuntu1.7

Ubuntu 16.04 ESM:
  vim                             2:7.4.1689-3ubuntu1.5+esm3

Ubuntu 14.04 ESM:
  vim                             2:7.4.052-1ubuntu3.1+esm4

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

References:
  https://ubuntu.com/security/notices/USN-5147-1
  CVE-2017-17087, CVE-2019-20807, CVE-2021-3872, CVE-2021-3903,
  CVE-2021-3927, CVE-2021-3928

Package Information:
  https://launchpad.net/ubuntu/+source/vim/2:8.2.2434-3ubuntu3.1
  https://launchpad.net/ubuntu/+source/vim/2:8.2.2434-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/vim/2:8.1.2269-1ubuntu5.4
  https://launchpad.net/ubuntu/+source/vim/2:8.0.1453-1ubuntu1.7