USN-5292-4

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USN-5292-4

Summary: snapd regression

Details: 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. We apologize for the inconvenience. Original advisory details: 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. (CVE-2021-3155) 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. (CVE-2021-4120) 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. (CVE-2021-44730) 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. (CVE-2021-44731)

References: https://ubuntu.com/security/notices/USN-5292-4, https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1961365, https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1961791