Bug 1879570 (CVE-2020-13753)

Summary: CVE-2020-13753 webkitgtk: Improper access management to CLONE_NEWUSER and the TIOCSTI ioctl
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: erack, mcatanza, tpopela
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: webkitgtk 2.28.3 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in webkitgtk in versions prior to 2.28.3 and in WPE WebKit in versions prior to 2.28.3. The bubblewrap sandbox failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl. CLONE_NEWUSER could potentially be used to confuse xdg- desktop-portal, which allows access outside the sandbox. TIOCSTI can be used to directly execute commands outside the sandbox by writing to the controlling terminal’s input buffer, similar to CVE-2017-5226. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
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Clone Of: Environment:
Last Closed: 2020-09-22 20:41:35 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:    
Bug Blocks: 1879575    

Description Pedro Sampaio 2020-09-16 14:30:19 UTC 
The bubblewrap sandbox of WebKitGTK and WPE WebKit, prior to 2.28.3, failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl. CLONE_NEWUSER could potentially be used to confuse xdg- desktop-portal, which allows access outside the sandbox. TIOCSTI can be used to directly execute commands outside the sandbox by writing to the controlling terminal’s input buffer, similar to CVE-2017-5226. Versions affected: WebKitGTK before 2.28.3 and WPE WebKit before 2.28.3.
Comment 1 Pedro Sampaio 2020-09-16 14:30:24 UTC 
External References:

https://webkitgtk.org/security/WSA-2020-0006.html
Comment 2 Michael Catanzaro 2020-09-16 15:54:31 UTC 
Note that RHEL 7 and RHEL 8 are both unaffected (because WebKit is not yet sandboxed in RHEL).
Comment 3 Product Security DevOps Team 2020-09-22 20:41:35 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-2020-13753
Comment 4 errata-xmlrpc 2025-07-07 02:24:42 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