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List: ubuntu-security-announce
Subject: [USN-4705-1] Sudo vulnerabilities
From: Marc Deslauriers <marc.deslauriers () canonical ! com>
Date: 2021-01-26 19:27:11
Message-ID: f8f74de9-c1cd-fdf1-3596-52c7594fe8cd () canonical ! com
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==========================================================================
Ubuntu Security Notice USN-4705-1
January 26, 2021
sudo vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Sudo.
Software Description:
- sudo: Provide limited super user privileges to specific users
Details:
It was discovered that Sudo incorrectly handled memory when parsing command
lines. A local attacker could possibly use this issue to obtain unintended
access to the administrator account. (CVE-2021-3156)
It was discovered that the Sudo sudoedit utility incorrectly handled
checking directory permissions. A local attacker could possibly use this
issue to bypass file permissions and determine if a directory exists or
not. (CVE-2021-23239)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
sudo 1.9.1-1ubuntu1.1
sudo-ldap 1.9.1-1ubuntu1.1
Ubuntu 20.04 LTS:
sudo 1.8.31-1ubuntu1.2
sudo-ldap 1.8.31-1ubuntu1.2
Ubuntu 18.04 LTS:
sudo 1.8.21p2-3ubuntu1.4
sudo-ldap 1.8.21p2-3ubuntu1.4
Ubuntu 16.04 LTS:
sudo 1.8.16-0ubuntu1.10
sudo-ldap 1.8.16-0ubuntu1.10
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4705-1
CVE-2021-23239, CVE-2021-3156
Package Information:
https://launchpad.net/ubuntu/+source/sudo/1.9.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/sudo/1.8.31-1ubuntu1.2
https://launchpad.net/ubuntu/+source/sudo/1.8.21p2-3ubuntu1.4
https://launchpad.net/ubuntu/+source/sudo/1.8.16-0ubuntu1.10
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