Bug 2024174 (CVE-2021-3982)

Summary:	CVE-2021-3982 gnome-shell: Distributions using CAP_SYS_NICE in gnome-shell may be exposed to privilege escalation
Product:	[Other] Security Response	Reporter:	Marco Benatto <mbenatto>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adscvr, ajak, fmuellner, gnome-sig, jadahl, otaylor, philip.wyett, rstrode, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-30 15:24:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2026996, 2026997
Bug Blocks:	1943154, 2025016

Description Marco Benatto 2021-11-17 13:49:19 UTC

Linux distributions using CAP_SYS_NICE for gnome-shell may be exposed to a privilege escalation issue. An attacker, with low privilege permissions, may take advantage of the way CAP_SYS_NICE is currently implemented and eventually load code to increase its process scheduler priority leading to possible DoS of other services running in the same machine.

Comment 2 Marco Benatto 2021-11-26 19:44:15 UTC

Created gnome-shell tracking bugs for this issue:

Affects: fedora-all [bug 2026996]

Comment 4 Marco Benatto 2021-11-30 15:24:07 UTC

Closing this bug as NOTABUG as any RHEL version is really affected by this.

Comment 5 John Helmert III 2022-04-30 21:56:16 UTC

Why did it take 5 months for this CVE to be made public?

The only upstream reference in the CVE for this issue was closed as a duplicate. Please add these as references:

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2284
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2060