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USN-5292-3: snapd vulnerabilities

18 February 2022

Several security issues were fixed in snapd.

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Releases

Packages

  • snapd - Daemon and tooling that enable snap packages

Details

USN-5292-1 fixed several vulnerabilities in snapd. This update provides the
corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

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)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04
Ubuntu 14.04

In general, a standard system update will make all the necessary changes.

References

Related notices

  • USN-5292-1: snapd-xdg-open, snapd, ubuntu-core-snapd-units, ubuntu-snappy, ubuntu-core-launcher, ubuntu-snappy-cli, golang-github-snapcore-snapd-dev, golang-github-ubuntu-core-snappy-dev, snap-confine
  • USN-5292-2: snapd-xdg-open, snapd, ubuntu-core-snapd-units, ubuntu-snappy, ubuntu-core-launcher, ubuntu-snappy-cli, golang-github-snapcore-snapd-dev, golang-github-ubuntu-core-snappy-dev, snap-confine

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Further reading