CVE-2017-20148

Publication date 20 September 2022

Last updated 11 July 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In the ebuild package through logcheck-1.3.23.ebuild for Logcheck on Gentoo, it is possible to achieve root privilege escalation from the logcheck user because of insecure recursive chown calls.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
logcheck	25.10 questing	Needs evaluation
	25.04 plucky	Needs evaluation
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Needs evaluation
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Ignored end of standard support

Notes

sbeattie

issue in gentoo packaging, but the debian package postinst also does a recursive chown that bears investigation.

mdeslaur

The scenario listed in the gentoo bug is mitigated by fs.protected_hardlinks = 1, downgrading severity to low

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H