========================================================================== Ubuntu Security Notice USN-5292-2 February 18, 2022
snapd vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in snapd. Software Description: - snapd: Daemon and tooling that enable snap packages Details: USN-5292-1 fixed vulnerabilities in snapd. This update provides the corresponding update for the riscv64 architecture. 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) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: snap-confine 2.54.3+20.04.1 snapd 2.54.3+20.04.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5292-2 https://ubuntu.com/security/notices/USN-5292-1 CVE-2021-3155, CVE-2021-4120, CVE-2021-44730, CVE-2021-44731 Package Information: https://launchpad.net/ubuntu/+source/snapd/2.54.3+20.04.1
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