CVE-2021-23239

Publication date 12 January 2021

Last updated 18 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

2.5 · Low

Score breakdown

Description

The sudoedit personality of Sudo before 1.9.5 may allow a local unprivileged user to perform arbitrary directory-existence tests by winning a sudo_edit.c race condition in replacing a user-controlled directory by a symlink to an arbitrary path.

Status

Package Ubuntu Release Status
sudo 25.10 questing
Fixed 1.9.4p2-2ubuntu2
25.04 plucky
Fixed 1.9.4p2-2ubuntu2
24.10 oracular
Fixed 1.9.4p2-2ubuntu2
24.04 LTS noble
Fixed 1.9.4p2-2ubuntu2
23.10 mantic
Fixed 1.9.4p2-2ubuntu2
23.04 lunar
Fixed 1.9.4p2-2ubuntu2
22.10 kinetic
Fixed 1.9.4p2-2ubuntu2
22.04 LTS jammy
Fixed 1.9.4p2-2ubuntu2
21.10 impish
Fixed 1.9.4p2-2ubuntu2
21.04 hirsute
Fixed 1.9.4p2-2ubuntu2
20.10 groovy
Fixed 1.9.1-1ubuntu1.1
20.04 LTS focal
Fixed 1.8.31-1ubuntu1.2
18.04 LTS bionic
Fixed 1.8.21p2-3ubuntu1.4
16.04 LTS xenial
Fixed 1.8.16-0ubuntu1.10
14.04 LTS trusty
Vulnerable

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
sudo

Severity score breakdown

Parameter Value
Base score 2.5 · Low
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references