---
title: "CVE-2019-10063\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-10063?format=md
keywords: index, follow
---

# CVE-2019-10063

Publication date 26 March 2019

Last updated 17 July 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**9.0 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-10063?format=md#impact-score)

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## Description

Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1
allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226
by using a seccomp filter to prevent sandboxed apps from using the TIOCSTI
ioctl, which could otherwise be used to inject commands into the
controlling terminal so that they would be executed outside the sandbox
after the sandboxed app exits. This fix was incomplete: on 64-bit
platforms, the seccomp filter could be bypassed by an ioctl request number
that has TIOCSTI in its 32 least significant bits and an arbitrary nonzero
value in its 32 most significant bits, which the Linux kernel would treat
as equivalent to TIOCSTI.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| flatpak | 19.04 disco | Not affected |
| 18.10 cosmic | Fixed 1.0.8-0ubuntu0.18.10.1 |
| 18.04 LTS bionic | Fixed 1.0.8-0ubuntu0.18.04.1 |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.0 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Changed |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.0 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-10063)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-10063)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-10063)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-10063)

### Other references

* <https://github.com/flatpak/flatpak/issues/2782>
* <https://github.com/flatpak/flatpak/commit/a9107feeb4b8275b78965b36bf21b92d5724699e>
* <https://www.cve.org/CVERecord?id=CVE-2019-10063>