Vulnerability · Published Apr 18, 2024 · Assigned by GitHub_M
CVE-2024-32462Flatpak vulnerable to a sandbox escape via RequestBackground portal due to bad argument parsing
High 8.4
In plain English
A high-severity argument injection in flatpak from flatpak. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. in versions before 1.10.9, 1.12.9, 1.14.6, and 1.15.8, a malicious or compromised Flatpak app could execute arbitrary code outside its sandbox. Normally, the `--command` argument of `flatpak run` expects to be given a command to run in the specified Flatpak app, optionally along with some arguments. However it is possible to instead pass `bwrap` arguments to `--command=`, such as `--bind`. It's possible to pass an arbitrary `commandline` to the portal interface `org.freedesktop.portal.Background.RequestBackground` from within a Flatpak app. When this is converted into a `--command` and arguments, it achieves the same effect of passing arguments directly to `bwrap`, and thus can be used for a sandbox escape. The solution is to pass the `--` argument to `bwrap`, which makes it stop processing options. This has been supported since bubblewrap 0.3.0. All supported versions of Flatpak require at least that version of bubblewrap. xdg-desktop-portal version 1.18.4 will mitigate this vulnerability by only allowing Flatpak apps to create .desktop files for commands that do not start with --. The vulnerability is patched in 1.15.8, 1.10.9, 1.12.9, and 1.14.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | flatpak | 1.12.9-1.el8_10 | ALSA-2024:3961 |
| AlmaLinux:9 | flatpak | 1.12.9-1.el9_4 | ALSA-2024:3959 |
| AlmaLinux:8 | flatpak-devel | 1.12.9-1.el8_10 | ALSA-2024:3961 |
| AlmaLinux:9 | flatpak-devel | 1.12.9-1.el9_4 | ALSA-2024:3959 |
| AlmaLinux:8 | flatpak-libs | 1.12.9-1.el8_10 | ALSA-2024:3961 |
| AlmaLinux:9 | flatpak-libs | 1.12.9-1.el9_4 | ALSA-2024:3959 |
| AlmaLinux:8 | flatpak-selinux | 1.12.9-1.el8_10 | ALSA-2024:3961 |
| AlmaLinux:9 | flatpak-selinux | 1.12.9-1.el9_4 | ALSA-2024:3959 |
| AlmaLinux:8 | flatpak-session-helper | 1.12.9-1.el8_10 | ALSA-2024:3961 |
| AlmaLinux:9 | flatpak-session-helper | 1.12.9-1.el9_4 | ALSA-2024:3959 |
| Alpine:v3.20 | flatpak | 1.14.6-r1 | ALPINE-CVE-2024-32462 |
| Alpine:v3.21 | flatpak | 1.14.6-r1 | ALPINE-CVE-2024-32462 |
| Alpine:v3.22 | flatpak | 1.14.6-r1 | ALPINE-CVE-2024-32462 |
| Alpine:v3.23 | flatpak | 1.14.6-r1 | ALPINE-CVE-2024-32462 |
| Alpine:v3.24 | flatpak | 1.14.6-r1 | ALPINE-CVE-2024-32462 |
| Debian:12 | flatpak | 1.14.4-1+deb12u1 | DSA-5666-1 |
| Debian:12 | flatpak | 1.14.4-1+deb12u1 | DEBIAN-CVE-2024-32462 |
| Debian:13 | flatpak | 1.14.6-1 | DEBIAN-CVE-2024-32462 |
| Debian:14 | flatpak | 1.14.6-1 | DEBIAN-CVE-2024-32462 |
| Rocky Linux:8 | flatpak | 0:1.12.9-1.el8_10 | RLSA-2024:3961 |
| Rocky Linux:9 | flatpak | 0:1.12.9-1.el9_4 | RLSA-2024:3959 |
| Ubuntu:24.04:LTS | flatpak | 1.14.6-1 | UBUNTU-CVE-2024-32462 |
Affected products (as reported)
Weakness: CWE-88 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
References
- https://github.com/flatpak/flatpak/security/advisories/GHSA-phv6-cpc2-2fgj x_refsource_CONFIRM
- https://github.com/flatpak/flatpak/commit/72016e3fce8fcbeab707daf4f1a02b931fcc004d x_refsource_MISC
- https://github.com/flatpak/flatpak/commit/81abe2a37d363f5099c3d0bdcd0caad6efc5bf97 x_refsource_MISC
- https://github.com/flatpak/flatpak/commit/b7c1a558e58aaeb1d007d29529bbb270dc4ff11e x_refsource_MISC
- https://github.com/flatpak/flatpak/commit/bbab7ed1e672356d1a78b422462b210e8e875931 x_refsource_MISC
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFNSCFJVMAQK5AF55JBN7OSJP3CREDBD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IB6VQAF5S2YOBULDHPUKPOEIKONOP5KO/
- http://www.openwall.com/lists/oss-security/2024/04/18/5