CVE-2019-10063
Description
An incomplete fix for CVE-2017-5226 was found in flatpak. A sandbox bypass flaw was found in the way bubblewrap, which is used for sandboxing flatpak applications handled the TIOCSTI ioctl. A malicious flatpak application could use this flaw to inject commands into the controlled terminal of the host after the flatpak applications exits. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Statement
This flaw can be exploited by malicious flatpak applications which include the code to exploit the wrong handling of the TIOCSTI ioctl (AV:L). No special action is needed to be performed by the attacker just having the exploit code should be enough for bypassing the sandbox restrictions (AC:L), Also the applications needs to be downloaded and run by the victim (PR:L). The flaw results in code being executed on the host system which is running the sandboxed application therefore this affects the host beyond the sandboxed application (S:C). Lastly considering the worst scenario in which the flatpak is run as root on the host system, this flaw can result in the malicious application running code as root on the host system (CIA:H).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | 9 | N/A |
| Attack Vector | Local | Network | N/A |
| Attack Complexity | Low | High | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Changed | Changed | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
A user can access restricted functionality and/or sensitive information that may include administrative functionality and user accounts.
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