# CVE-2020-13753: Security feature bypass in n/a

> Attackers can escape the WebKitGTK sandbox to execute arbitrary commands or confuse desktop portals due to improper blocking of specific system calls.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-13753, GHSA-7vvx-4whv-jg73, UBUNTU-CVE-2020-13753

## What is CVE-2020-13753?

CVE-2020-13753 is a critical vulnerability in Canonical Ubuntu Linux, published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-13753?

It affects 6 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Webkitgtk Webkitgtk, Wpewebkit Wpe Webkit.

## How do I fix CVE-2020-13753?

Upgrade to a fixed version.

## Is CVE-2020-13753 being exploited?

There is no known exploitation of CVE-2020-13753 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-13753 and fix it if it is affected.

What it is: CVE-2020-13753 is a critical vulnerability in Canonical Ubuntu Linux, published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-13753 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-13753/ (Markdown: https://insights.sbomify.com/CVE-2020-13753/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13753
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13753
- OSV: https://osv.dev/vulnerability/CVE-2020-13753

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-13753/
Summaries are generated and may contain mistakes; the official description above is the record.