Exploit/Advisories

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Ubuntu Security Notice USN-5613-2
September 19, 2022

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

- Ubuntu 20.04 LTS

Summary:

USN-5613-1 caused a regression in Vim.

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

Details:

USN-5613-1 fixed vulnerabilities in Vim. Unfortunately that update failed
to include binary packages for some architectures. This update fixes that
regression.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Vim was not properly performing bounds checks
when executing spell suggestion commands. An attacker could possibly use
this issue to cause a denial of service or execute arbitrary code.
(CVE-2022-0943)

It was discovered that Vim was using freed memory when dealing with
regular expressions through its old regular expression engine. 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. (CVE-2022-1154)

It was discovered that Vim was not properly performing checks on name of
lambda functions. An attacker could possibly use this issue to cause a
denial of service. This issue affected only Ubuntu 22.04 LTS.
(CVE-2022-1420)

It was discovered that Vim was incorrectly performing bounds checks
when processing invalid commands with composing characters in Ex
mode. An attacker could possibly use this issue to cause a denial of
service or execute arbitrary code. (CVE-2022-1616)

It was discovered that Vim was not properly processing latin1 data
when issuing Ex commands. An attacker could possibly use this issue to
cause a denial of service or execute arbitrary code. (CVE-2022-1619)

It was discovered that Vim was not properly performing memory
management when dealing with invalid regular expression patterns in
buffers. An attacker could possibly use this issue to cause a denial of
service. (CVE-2022-1620)

It was discovered that Vim was not properly processing invalid bytes
when performing spell check operations. An attacker could possibly use
this issue to cause a denial of service or execute arbitrary code.
(CVE-2022-1621)

Update instructions:

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

Ubuntu 20.04 LTS:
vim 2:8.1.2269-1ubuntu5.9

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

References:
https://ubuntu.com/security/notices/USN-5613-2
https://ubuntu.com/security/notices/USN-5613-1
CVE-2022-0943, CVE-2022-1154, CVE-2022-1420, CVE-2022-1616,
CVE-2022-1619, CVE-2022-1620, CVE-2022-1621, https://launchpad.net/bugs/1989973

Package Information:
https://launchpad.net/ubuntu/+source/vim/2:8.1.2269-1ubuntu5.9

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