Bug 2016673 (CVE-2021-42762)

Summary:	CVE-2021-42762 webkitgtk: limited sandbox escape via VFS syscalls
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gnome-sig, mcatanza, tpopela
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:	2022-05-17 13:45:59 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:	2016674, 2017709
Bug Blocks:	2016675

Description Guilherme de Almeida Suckevicz 2021-10-22 16:15:53 UTC

BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133.

References:
https://bugs.webkit.org/show_bug.cgi?id=231479
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q

Comment 1 Guilherme de Almeida Suckevicz 2021-10-22 16:16:23 UTC

Created webkit2gtk3 tracking bugs for this issue:

Affects: fedora-all [bug 2016674]

Comment 5 Product Security DevOps Team 2022-05-17 13:45:57 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-42762

Comment 6 errata-xmlrpc 2025-07-07 02:28:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2025:10364 https://access.redhat.com/errata/RHSA-2025:10364