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Ubuntu: USN-4424-1 (CVE-2020-11934): snapd vulnerabilities

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Ubuntu: USN-4424-1 (CVE-2020-11934): snapd vulnerabilities

Severity
2
CVSS
(AV:L/AC:M/Au:N/C:N/I:P/A:N)
Published
07/15/2020
Created
08/07/2020
Added
08/05/2020
Modified
03/22/2023

Description

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.

Solution(s)

  • ubuntu-upgrade-snapd

References

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