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Ubuntu Security Notice USN-4705-1

Ubuntu Security Notice USN-4705-1
Posted Jan 27, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4705-1 - 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. 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. Various other issues were also addressed.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2021-23239, CVE-2021-3156
MD5 | 7441929fd8273b9e8c967ac727cda7ea

Ubuntu Security Notice USN-4705-1

Change Mirror Download
==========================================================================
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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