A Sudo security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 22.04 LTS, and 22.10.

USN-5811-1: Sudo vulnerabilities

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Ubuntu Security Notice USN-5811-1
January 18, 2023

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Sudo.

Software Description:
- sudo: Provide limited super user privileges to specific users

Details:

Matthieu Barjole and Victor Cutillas discovered that Sudo incorrectly
handled user-specified editors when using the sudoedit command. A local
attacker that has permission to use the sudoedit command could possibly use
this issue to edit arbitrary files. (CVE-2023-22809)

It was discovered that the Protobuf-c library, used by Sudo, incorrectly
handled certain arithmetic shifts. An attacker could possibly use this
issue to cause Sudo to crash, resulting in a denial of service. This issue
only affected Ubuntu 22.04 LTS. (CVE-2022-33070)

Update instructions:

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

Ubuntu 22.10:
sudo 1.9.11p3-1ubuntu1.1
sudo-ldap 1.9.11p3-1ubuntu1.1

Ubuntu 22.04 LTS:
sudo 1.9.9-1ubuntu2.2
sudo-ldap 1.9.9-1ubuntu2.2

Ubuntu 20.04 LTS:
sudo 1.8.31-1ubuntu1.4
sudo-ldap 1.8.31-1ubuntu1.4

Ubuntu 18.04 LTS:
sudo 1.8.21p2-3ubuntu1.5
sudo-ldap 1.8.21p2-3ubuntu1.5

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

References:
https://ubuntu.com/security/notices/USN-5811-1
CVE-2022-33070, CVE-2023-22809

Package Information:
https://launchpad.net/ubuntu/+source/sudo/1.9.11p3-1ubuntu1.1
https://launchpad.net/ubuntu/+source/sudo/1.9.9-1ubuntu2.2
https://launchpad.net/ubuntu/+source/sudo/1.8.31-1ubuntu1.4
https://launchpad.net/ubuntu/+source/sudo/1.8.21p2-3ubuntu1.5