CVE-2021-3155

snapd versiones 2.54.2 y anteriores, creaban directorios ~/snap en los directorios personales de usuarios sin especificar los permisos de sólo propietario. Esto podía permitir a un atacante local leer información que debería ser privada. Corregido en snapd versiones 2.54.3+18.04, 2.54.3+20.04 y 2.54.3+21.10.1

USN-5292-1 fixed a vulnerability in snapd. Unfortunately that update introduced a regression that could break the fish shell. This update fixes the problem. James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information. Ian Johnson discovered that snapd did not properly validate content interfaces and layout paths. A local attacker could possibly use this issue to inject arbitrary AppArmor policy rules, resulting in a bypass of intended access restrictions. The Qualys Research Team discovered that snapd did not properly validate the location of the snap-confine binary. A local attacker could possibly use this issue to execute other arbitrary binaries and escalate privileges. The Qualys Research Team discovered that a race condition existed in the snapd snap-confine binary when preparing a private mount namespace for a snap. A local attacker could possibly use this issue to escalate privileges and execute arbitrary code.