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Vulnerability Details : CVE-2021-41133

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-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version.
Publish Date : 2021-10-08 Last Update Date : 2021-12-04
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- CVSS Scores & Vulnerability Types

CVSS Score
4.6
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 20

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:4042: flatpak security update (Important) oval:com.redhat.rhsa:def:20214042 unix
RHSA-2021:4044: flatpak security update (Important) oval:com.redhat.rhsa:def:20214044 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-41133

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
4 Application Flatpak Flatpak * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Fedoraproject Fedora 2
Flatpak Flatpak 1

- References For CVE-2021-41133

http://www.openwall.com/lists/oss-security/2021/10/26/9
MLIST [oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006
https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999
https://lists.fedoraproject.org/archives/list/[email protected]/message/R5656ONDP2MGKIJMKEC7N2NXCV27WGTC/
FEDORA FEDORA-2021-4b201d15e6
https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf
https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf
https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q CONFIRM
https://github.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34ca
https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f
https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36
https://www.debian.org/security/2021/dsa-4984
DEBIAN DSA-4984
https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48
https://lists.fedoraproject.org/archives/list/[email protected]/message/T5DKCYRC6MFSTFCUP4DELCOUUP3SFEFX/
FEDORA FEDORA-2021-c5a9c85737
https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330

- Metasploit Modules Related To CVE-2021-41133

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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