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Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : snapd regression (USN-5292-4)

info Nessus Plugin ID 158258

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-5292-4 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-5292-4

Plugin Details

Severity: Info

ID: 158258

File Name: ubuntu_USN-5292-4.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2/22/2022

Updated: 8/27/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:ubuntu-core-launcher, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:snapd-xdg-open, p-cpe:/a:canonical:ubuntu_linux:snapd, p-cpe:/a:canonical:ubuntu_linux:ubuntu-snappy-cli, p-cpe:/a:canonical:ubuntu_linux:snap-confine, p-cpe:/a:canonical:ubuntu_linux:golang-github-ubuntu-core-snappy-dev, p-cpe:/a:canonical:ubuntu_linux:golang-github-snapcore-snapd-dev, p-cpe:/a:canonical:ubuntu_linux:ubuntu-snappy, p-cpe:/a:canonical:ubuntu_linux:ubuntu-core-snapd-units, cpe:/o:canonical:ubuntu_linux:16.04:-:esm

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 2/22/2022

Vulnerability Publication Date: 2/22/2022

Reference Information

USN: 5292-4