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CVE-2021-41133

8.8 · HIGH

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

Published Oct 8, 2021CWE-20EPSS 0.44%

Overview

CVE-2021-41133 is a high-severity vulnerability. It was published on October 8, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2021/10/26/9GitHubgithub.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999GitHubgithub.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34caGitHubgithub.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aafGitHubgithub.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36GitHubgithub.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48GitHubgithub.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69fGitHubgithub.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330GitHubgithub.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cfGitHubgithub.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41133?

CVE-2021-41133 is a high-severity vulnerability. It was published on October 8, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-41133?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-41133?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41133?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41133 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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