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This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2

SYNTHESIS OF THE VULNERABILITY

Impacted products: Debian, Fedora.

Severity: 2/4.

Consequences: privileged access/rights, user access/rights.

Provenance: document.

Confidence: confirmed by the editor (5/5).

Creation date: 14/01/2021.

DESCRIPTION OF THE VULNERABILITY

An attacker, inside a guest system, can bypass restrictions via
Sandbox Escape of Flatpak, in order to escalate his privileges on
the host system.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Flatpak-privilege-escalation-via-Sandbox-Escape-34352