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CVE-2024-42472

Flatpak may allow access to files outside sandbox for certain apps

Summary

Flatpak may allow access to files outside sandbox for certain apps

Original description

The description as published by the source.

Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a malicious or compromised Flatpak app using persistent directories could access and write files outside of what it would otherwise have access to, which is an attack on integrity and confidentiality.

When persistent=subdir is used in the application permissions (represented as --persist=subdir in the command-line interface), that means that an application which otherwise doesn't have access to the real user home directory will see an empty home directory with a writeable subdirectory subdir. Behind the scenes, this directory is actually a bind mount and the data is stored in the per-application directory as ~/.var/app/$APPID/subdir. This allows existing apps that are not aware of the per-application directory to still work as intended without general home directory access.

However, the application does have write access to the application directory ~/.var/app/$APPID where this directory is stored. If the source directory for the persistent/--persist option is replaced by a symlink, then the next time the application is started, the bind mount will follow the symlink and mount whatever it points to into the sandbox.

Partial protection against this vulnerability can be provided by patching Flatpak using the patches in commits ceec2ffc and 98f79773. However, this leaves a race condition that could be exploited by two instances of a malicious app running i…

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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