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Amazon Linux AMI 2: CVE-2024-32462: Security patch for flatpak (ALAS-2024-2538)

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Amazon Linux AMI 2: CVE-2024-32462: Security patch for flatpak (ALAS-2024-2538)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
04/18/2024
Created
05/16/2024
Added
05/16/2024
Modified
05/16/2024

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.

Solution(s)

  • amazon-linux-ami-2-upgrade-flatpak
  • amazon-linux-ami-2-upgrade-flatpak-builder
  • amazon-linux-ami-2-upgrade-flatpak-debuginfo
  • amazon-linux-ami-2-upgrade-flatpak-devel
  • amazon-linux-ami-2-upgrade-flatpak-libs

References

  • https://attackerkb.com/topics/cve-2024-32462
  • AL2/ALAS-2024-2538
  • CVE - 2024-32462
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