==========================================================================
Ubuntu Security Notice USN-6026-1
April 19, 2023

vim 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 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 was incorrectly processing Vim buffers. An      
attacker could possibly use this issue to perform illegal memory access and
expose sensitive information. This issue only affected Ubuntu 20.04 LTS.
(CVE-2021-4166)

It was discovered that Vim was using freed memory when dealing with regular
expressions inside a visual selection. If a user were tricked into opening a
specially crafted file, an attacker could crash the application, leading to a
denial of service, or possibly achieve code execution with user privileges.
This issue only affected Ubuntu 14.04 ESM, Ubuntu 18.04 LTS and Ubuntu
20.04 LTS. (CVE-2021-4192)

It was discovered that Vim was incorrectly handling virtual column position
operations, which could result in an out-of-bounds read. An attacker could
possibly use this issue to expose sensitive information. This issue only
affected Ubuntu 14.04 ESM, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2021-4193)

It was discovered that Vim was not properly performing bounds checks when
updating windows present on a screen, which could result in a heap buffer
overflow. An attacker could possibly use this issue to cause a denial of
service or execute arbitrary code. (CVE-2022-0213)

It was discovered that Vim was incorrectly performing read and write
operations when in visual block mode, going beyond the end of a line and
causing a heap buffer overflow. If a user were tricked into opening a
specially crafted file, an attacker could crash the application, leading to a
denial of service, or possibly achieve code execution with user privileges.
This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu
22.04 LTS. (CVE-2022-0261, CVE-2022-0318)

It was discovered that Vim was incorrectly handling window exchanging
operations when in Visual mode, which could result in an out-of-bounds read.
An attacker could possibly use this issue to expose sensitive information.
(CVE-2022-0319)

It was discovered that Vim was incorrectly handling recursion when parsing
conditional expressions. An attacker could possibly use this issue to cause
a denial of service or execute arbitrary code. (CVE-2022-0351)

It was discovered that Vim was not properly handling memory allocation when
processing data in Ex mode, which could result in a heap buffer overflow.
An attacker could possibly use this issue to cause a denial of service or
execute arbitrary code. (CVE-2022-0359)

It was discovered that Vim was not properly performing bounds checks when
executing line operations in Visual mode, which could result in a heap
buffer overflow. An attacker could possibly use this issue to cause a
denial of service or execute arbitrary code. This issue only affected
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-0361,
CVE-2022-0368)

It was discovered that Vim was not properly handling loop conditions when
looking for spell suggestions, which could result in a stack buffer
overflow. An attacker could possibly use this issue to cause a denial of
service or execute arbitrary code. (CVE-2022-0408)

It was discovered that Vim was incorrectly handling memory access when
executing buffer operations, which could result in the usage of freed
memory. An attacker could possibly use this issue to execute arbitrary
code. (CVE-2022-0443)

It was discovered that Vim was incorrectly processing Vim buffers. An
attacker could possibly use this issue to perform illegal memory access and
expose sensitive information. (CVE-2022-0554)

It was discovered that Vim was not properly performing bounds checks for
column numbers when replacing tabs with spaces or spaces with tabs, which
could cause a heap buffer overflow. An attacker could possibly use this
issue to cause a denial of service or execute arbitrary code.
(CVE-2022-0572)

It was discovered that Vim was incorrectly processing Vim buffers. An
attacker could possibly use this issue to perform illegal memory access and
expose sensitive information. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 22.04 LTS. (CVE-2022-0629)

It was discovered that Vim was not properly performing validation of data
that contained special multi-byte characters, which could cause an
out-of-bounds read. An attacker could possibly use this issue to cause a
denial of service. (CVE-2022-0685)

It was discovered that Vim was incorrectly processing data used to define
indentation in a file, which could cause a heap buffer overflow. An
attacker could possibly use this issue to cause a denial of service.
(CVE-2022-0714)

It was discovered that Vim was incorrectly processing certain regular
expression patterns and strings, which could cause an out-of-bounds read.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2022-0729)

It was discovered that Vim incorrectly handled memory access. An attacker
could potentially use this issue to cause the corruption of sensitive
information, a crash, or arbitrary code execution. (CVE-2022-2207)

Update instructions:

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

Ubuntu 22.04 LTS:
  vim                             2:8.2.3995-1ubuntu2.7

Ubuntu 20.04 LTS:
  vim                             2:8.1.2269-1ubuntu5.14

Ubuntu 18.04 LTS:
  vim                             2:8.0.1453-1ubuntu1.13

Ubuntu 14.04 ESM:
  vim                             2:7.4.052-1ubuntu3.1+esm9

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

References:
  https://ubuntu.com/security/notices/USN-6026-1
  CVE-2021-4166, CVE-2021-4192, CVE-2021-4193, CVE-2022-0213,
  CVE-2022-0261, CVE-2022-0318, CVE-2022-0319, CVE-2022-0351,
  CVE-2022-0359, CVE-2022-0361, CVE-2022-0368, CVE-2022-0408,
  CVE-2022-0443, CVE-2022-0554, CVE-2022-0572, CVE-2022-0629,
  CVE-2022-0685, CVE-2022-0714, CVE-2022-0729, CVE-2022-2207

Package Information:
  https://launchpad.net/ubuntu/+source/vim/2:8.2.3995-1ubuntu2.7
  https://launchpad.net/ubuntu/+source/vim/2:8.1.2269-1ubuntu5.14
  https://launchpad.net/ubuntu/+source/vim/2:8.0.1453-1ubuntu1.13