Vulnerability in Flatpak
CVE-2024-32462
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000
Affected products
- Flatpak — versions < 1.10.9, >= 1.12.0, < 1.12.9, >= 1.14.0, < 1.14.6
- Fedoraproject Fedora — versions 39, 40
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/flatpak/flatpak/security/advisories/GHSA-phv6-cpc2-2fgj (Vendor Advisory)
- github.com/flatpak/flatpak/commit/72016e3fce8fcbeab707daf4f1a02b931fcc004d (Patch)
- github.com/flatpak/flatpak/commit/81abe2a37d363f5099c3d0bdcd0caad6efc5bf97 (Patch)
- github.com/flatpak/flatpak/commit/b7c1a558e58aaeb1d007d29529bbb270dc4ff11e (Patch)
- github.com/flatpak/flatpak/commit/bbab7ed1e672356d1a78b422462b210e8e875931 (Patch)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- www.openwall.com/lists/oss-security/2024/04/18/5 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2024-32462?
- CVE-2024-32462 is a high-severity vulnerability in Flatpak, classified under Argument Injection. CVSS score: 8.4/10. Published 2024-04-18.
- How severe is CVE-2024-32462?
- High severity. CVSS v3 base score is 8.4 out of 10.
- Is CVE-2024-32462 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.