Exposure of Resource to Wrong Sphere Affecting snapd package, versions <2.45.1+20.04.2


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-UBUNTU2004-SNAPD-584788
  • published15 Jul 2020
  • disclosed29 Jul 2020

Introduced: 15 Jul 2020

CVE-2020-11934  (opens in a new tab)
CWE-668  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 snapd to version 2.45.1+20.04.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream snapd package and not the snapd package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.

CVSS Scores

version 3.1