Bug 2016673 (CVE-2021-42762) - CVE-2021-42762 webkitgtk: limited sandbox escape via VFS syscalls
Summary: CVE-2021-42762 webkitgtk: limited sandbox escape via VFS syscalls
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-42762
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2016674 2017709
Blocks: 2016675
TreeView+ depends on / blocked
 
Reported: 2021-10-22 16:15 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 13:45 UTC (History)
3 users (show)

Fixed In Version:
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Last Closed: 2022-05-17 13:45:59 UTC
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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
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