CVE-2021-3621

Publication date 16 August 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs-fetch and cache-expire subcommands. This flaw allows an attacker to trick the root user into running a specially crafted sssctl command, such as via sudo, to gain root access. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
sssd	22.04 LTS jammy	Fixed 2.4.1-2ubuntu4
	21.10 impish	Fixed 2.4.1-2ubuntu4
	21.04 hirsute	Fixed 2.4.0-1ubuntu6.1
	20.04 LTS focal	Fixed 2.2.3-3ubuntu0.7
	18.04 LTS bionic	Fixed 1.16.1-1ubuntu1.8
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Notes

leosilva

vulnerability was introduced in v1.13.91 by commit: https://github.com/SSSD/sssd/commit/e157b9f6cb370e1b94bcac2044d26ad66d640fba xenial/esm is not-affected as it is based on 1.13.4-1 and so, code affected is not present.

Patch details

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

Package	Patch details
sssd	Upstream: 7ab83f9

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H